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lukaszlenart pushed a commit to branch WW-5259-parser
in repository https://gitbox.apache.org/repos/asf/struts.git

commit 47e65e819eaee5ff475bba0070940173942bd562
Author: Lukasz Lenart <lukaszlen...@apache.org>
AuthorDate: Sun Nov 6 18:50:43 2022 +0100

    WW-5259 Extracts UrlHelper#parseQueryString into a dedicated bean
---
 .../StrutsDefaultConfigurationProvider.java        |   9 +-
 .../java/org/apache/struts2/StrutsConstants.java   |   3 +-
 .../struts2/components/ExtraParameterProvider.java |   4 +-
 .../struts2/components/ServletUrlRenderer.java     |  29 ++-
 .../org/apache/struts2/components/UrlProvider.java |  22 +-
 .../config/StrutsBeanSelectionProvider.java        |   6 +-
 .../struts2/result/ServletDispatcherResult.java    |  14 +-
 .../struts2/result/ServletRedirectResult.java      |  19 +-
 ...sStringBuilder.java => QueryStringBuilder.java} |  13 +-
 ...rsStringBuilder.java => QueryStringParser.java} |   7 +-
 ...gBuilder.java => StrutsQueryStringBuilder.java} |   8 +-
 .../struts2/url/StrutsQueryStringParser.java       |  98 ++++++++
 .../java/org/apache/struts2/url/UrlDecoder.java    |   8 +-
 .../java/org/apache/struts2/url/UrlEncoder.java    |   8 +-
 .../struts2/views/util/DefaultUrlHelper.java       |  73 ++----
 .../org/apache/struts2/views/util/UrlHelper.java   |  18 +-
 .../org/apache/struts2/default.properties          |  13 +-
 core/src/main/resources/struts-default.xml         |   6 +-
 .../result/ServletActionRedirectResultTest.java    |  11 +-
 .../result/ServletDispatcherResultTest.java        |  21 +-
 .../struts2/result/ServletRedirectResultTest.java  |  10 +-
 ...Test.java => StrutsQueryStringBuilderTest.java} |  14 +-
 .../struts2/url/StrutsQueryStringParserTest.java   |  84 +++++++
 .../struts2/views/util/DefaultUrlHelperTest.java   |  36 +--
 .../main/java/org/apache/struts2/JSPRuntime.java   |  13 +-
 .../org/apache/struts2/EmbeddedJSPResultTest.java  |  24 +-
 .../struts2/json/JSONActionRedirectResultTest.java |  19 +-
 .../struts2/components/PortletUrlRenderer.java     |  77 ++++---
 .../result/PortletActionRedirectResult.java        | 247 +++++++++++----------
 29 files changed, 537 insertions(+), 377 deletions(-)

diff --git 
a/core/src/main/java/com/opensymphony/xwork2/config/providers/StrutsDefaultConfigurationProvider.java
 
b/core/src/main/java/com/opensymphony/xwork2/config/providers/StrutsDefaultConfigurationProvider.java
index d193c4d24..1f49cc11b 100644
--- 
a/core/src/main/java/com/opensymphony/xwork2/config/providers/StrutsDefaultConfigurationProvider.java
+++ 
b/core/src/main/java/com/opensymphony/xwork2/config/providers/StrutsDefaultConfigurationProvider.java
@@ -118,8 +118,10 @@ import 
org.apache.struts2.conversion.StrutsTypeConverterCreator;
 import org.apache.struts2.conversion.StrutsTypeConverterHolder;
 import org.apache.struts2.dispatcher.HttpParameters;
 import org.apache.struts2.dispatcher.Parameter;
-import org.apache.struts2.url.ParametersStringBuilder;
-import org.apache.struts2.url.StrutsParametersStringBuilder;
+import org.apache.struts2.url.QueryStringBuilder;
+import org.apache.struts2.url.QueryStringParser;
+import org.apache.struts2.url.StrutsQueryStringBuilder;
+import org.apache.struts2.url.StrutsQueryStringParser;
 import org.apache.struts2.url.StrutsUrlDecoder;
 import org.apache.struts2.url.StrutsUrlEncoder;
 import org.apache.struts2.url.UrlDecoder;
@@ -236,7 +238,8 @@ public class StrutsDefaultConfigurationProvider implements 
ConfigurationProvider
 
             .factory(ValueSubstitutor.class, EnvsValueSubstitutor.class, 
Scope.SINGLETON)
 
-            .factory(ParametersStringBuilder.class, 
StrutsParametersStringBuilder.class, Scope.SINGLETON)
+            .factory(QueryStringBuilder.class, StrutsQueryStringBuilder.class, 
Scope.SINGLETON)
+            .factory(QueryStringParser.class, StrutsQueryStringParser.class, 
Scope.SINGLETON)
             .factory(UrlEncoder.class, StrutsUrlEncoder.class, Scope.SINGLETON)
             .factory(UrlDecoder.class, StrutsUrlDecoder.class, Scope.SINGLETON)
         ;
diff --git a/core/src/main/java/org/apache/struts2/StrutsConstants.java 
b/core/src/main/java/org/apache/struts2/StrutsConstants.java
index 7f6955648..b7dec53b2 100644
--- a/core/src/main/java/org/apache/struts2/StrutsConstants.java
+++ b/core/src/main/java/org/apache/struts2/StrutsConstants.java
@@ -458,7 +458,8 @@ public final class StrutsConstants {
     /** See {@link 
org.apache.struts2.components.Date#setDateFormatter(DateFormatter)} */
     public static final String STRUTS_DATE_FORMATTER = "struts.date.formatter";
 
-    public static final String STRUTS_URL_PARAMETERS_STRING_BUILDER = 
"struts.url.parametersStringBuilder";
+    public static final String STRUTS_URL_QUERY_STRING_BUILDER = 
"struts.url.queryStringBuilder";
+    public static final String STRUTS_URL_QUERY_STRING_PARSER = 
"struts.url.queryStringParser";
     public static final String STRUTS_URL_ENCODER = "struts.url.encoder";
     public static final String STRUTS_URL_DECODER = "struts.url.decoder";
 }
diff --git 
a/core/src/main/java/org/apache/struts2/components/ExtraParameterProvider.java 
b/core/src/main/java/org/apache/struts2/components/ExtraParameterProvider.java
index 9734c6b6b..1d3719550 100644
--- 
a/core/src/main/java/org/apache/struts2/components/ExtraParameterProvider.java
+++ 
b/core/src/main/java/org/apache/struts2/components/ExtraParameterProvider.java
@@ -21,5 +21,7 @@ package org.apache.struts2.components;
 import java.util.Map;
 
 public interface ExtraParameterProvider {
-    public Map getExtraParameters();
+
+    Map<String, Object> getExtraParameters();
+
 }
diff --git 
a/core/src/main/java/org/apache/struts2/components/ServletUrlRenderer.java 
b/core/src/main/java/org/apache/struts2/components/ServletUrlRenderer.java
index 18831e9ce..d5281a8a0 100644
--- a/core/src/main/java/org/apache/struts2/components/ServletUrlRenderer.java
+++ b/core/src/main/java/org/apache/struts2/components/ServletUrlRenderer.java
@@ -29,6 +29,7 @@ import org.apache.logging.log4j.Logger;
 import org.apache.struts2.StrutsException;
 import org.apache.struts2.dispatcher.mapper.ActionMapper;
 import org.apache.struts2.dispatcher.mapper.ActionMapping;
+import org.apache.struts2.url.QueryStringParser;
 import org.apache.struts2.views.util.UrlHelper;
 
 import java.io.IOException;
@@ -48,6 +49,7 @@ public class ServletUrlRenderer implements UrlRenderer {
 
     private ActionMapper actionMapper;
     private UrlHelper urlHelper;
+    private QueryStringParser queryStringParser;
 
     @Override
     @Inject
@@ -60,6 +62,11 @@ public class ServletUrlRenderer implements UrlRenderer {
         this.urlHelper = urlHelper;
     }
 
+    @Inject
+    public void setQueryStringParser(QueryStringParser queryStringParser) {
+        this.queryStringParser = queryStringParser;
+    }
+
     /**
      * {@inheritDoc}
      */
@@ -152,10 +159,10 @@ public class ServletUrlRenderer implements UrlRenderer {
             }
         }
 
-        Map actionParams = null;
+        Map<String, Object> actionParams = null;
         if (action != null && action.indexOf('?') > 0) {
             String queryString = action.substring(action.indexOf('?') + 1);
-            actionParams = urlHelper.parseQueryString(queryString, false);
+            actionParams = queryStringParser.parse(queryString, false);
             action = action.substring(0, action.indexOf('?'));
         }
 
@@ -164,19 +171,19 @@ public class ServletUrlRenderer implements UrlRenderer {
         String actionMethod = nameMapping.getMethod();
 
         final ActionConfig actionConfig = 
formComponent.configuration.getRuntimeConfiguration().getActionConfig(
-                namespace, actionName);
+            namespace, actionName);
         if (actionConfig != null) {
 
             ActionMapping mapping = new ActionMapping(actionName, namespace, 
actionMethod, formComponent.parameters);
             String result = 
urlHelper.buildUrl(formComponent.actionMapper.getUriFromActionMapping(mapping),
-                    formComponent.request, formComponent.response, 
actionParams, scheme, formComponent.includeContext, true, false, false);
+                formComponent.request, formComponent.response, actionParams, 
scheme, formComponent.includeContext, true, false, false);
             formComponent.addParameter("action", result);
 
             // let's try to get the actual action class and name
             // this can be used for getting the list of validators
             formComponent.addParameter("actionName", actionName);
             try {
-                Class clazz = 
formComponent.objectFactory.getClassInstance(actionConfig.getClassName());
+                Class<?> clazz = 
formComponent.objectFactory.getClassInstance(actionConfig.getClassName());
                 formComponent.addParameter("actionClass", clazz);
             } catch (ClassNotFoundException e) {
                 // this is OK, we'll just move on
@@ -258,7 +265,7 @@ public class ServletUrlRenderer implements UrlRenderer {
             }
 
             if (UrlProvider.NONE.equalsIgnoreCase(includeParams)) {
-                mergeRequestParameters(urlComponent.getValue(), 
urlComponent.getParameters(), Collections.<String, Object>emptyMap());
+                mergeRequestParameters(urlComponent.getValue(), 
urlComponent.getParameters(), Collections.emptyMap());
             } else if (UrlProvider.ALL.equalsIgnoreCase(includeParams)) {
                 mergeRequestParameters(urlComponent.getValue(), 
urlComponent.getParameters(), 
urlComponent.getHttpServletRequest().getParameterMap());
 
@@ -284,7 +291,7 @@ public class ServletUrlRenderer implements UrlRenderer {
 
     private void includeGetParameters(UrlProvider urlComponent) {
         String query = extractQueryString(urlComponent);
-        mergeRequestParameters(urlComponent.getValue(), 
urlComponent.getParameters(), urlHelper.parseQueryString(query, false));
+        mergeRequestParameters(urlComponent.getValue(), 
urlComponent.getParameters(), queryStringParser.parse(query, false));
     }
 
     private String extractQueryString(UrlProvider urlComponent) {
@@ -309,7 +316,7 @@ public class ServletUrlRenderer implements UrlRenderer {
      * Merge request parameters into current parameters. If a parameter is
      * already present, than the request parameter in the current request and 
value attribute
      * will not override its value.
-     *
+     * <p>
      * The priority is as follows:-
      * <ul>
      *  <li>parameter from the current request (least priority)</li>
@@ -317,8 +324,8 @@ public class ServletUrlRenderer implements UrlRenderer {
      *  <li>parameter from the param tag (most priority)</li>
      * </ul>
      *
-     * @param value the value attribute (URL to be generated by this component)
-     * @param parameters component parameters
+     * @param value             the value attribute (URL to be generated by 
this component)
+     * @param parameters        component parameters
      * @param contextParameters request parameters
      */
     protected void mergeRequestParameters(String value, Map<String, Object> 
parameters, Map<String, ?> contextParameters) {
@@ -332,7 +339,7 @@ public class ServletUrlRenderer implements UrlRenderer {
         if (StringUtils.contains(value, "?")) {
             String queryString = value.substring(value.indexOf('?') + 1);
 
-            mergedParams = urlHelper.parseQueryString(queryString, false);
+            mergedParams = queryStringParser.parse(queryString, false);
             for (Map.Entry<String, ?> entry : contextParameters.entrySet()) {
                 if (!mergedParams.containsKey(entry.getKey())) {
                     mergedParams.put(entry.getKey(), entry.getValue());
diff --git a/core/src/main/java/org/apache/struts2/components/UrlProvider.java 
b/core/src/main/java/org/apache/struts2/components/UrlProvider.java
index abb47c925..8c3b79040 100644
--- a/core/src/main/java/org/apache/struts2/components/UrlProvider.java
+++ b/core/src/main/java/org/apache/struts2/components/UrlProvider.java
@@ -25,7 +25,7 @@ import javax.servlet.http.HttpServletResponse;
 import java.util.Map;
 
 /**
- * Implemntations of this interface can be used to build a URL
+ * Implementations of this interface can be used to build a URL
  */
 public interface UrlProvider {
     /**
@@ -37,9 +37,9 @@ public interface UrlProvider {
      * get  - include only GET parameters in the URL (default)
      * all  - include both GET and POST parameters in the URL
      */
-    public static final String NONE = "none";
-    public static final String GET = "get";
-    public static final String ALL = "all";
+    String NONE = "none";
+    String GET = "get";
+    String ALL = "all";
 
     boolean isPutInContext();
 
@@ -55,7 +55,7 @@ public interface UrlProvider {
 
     String getIncludeParams();
 
-    Map getParameters();
+    Map<String, Object> getParameters();
 
     HttpServletRequest getHttpServletRequest();
 
@@ -78,19 +78,19 @@ public interface UrlProvider {
     boolean isForceAddSchemeHostAndPort();
 
     boolean isEscapeAmp();
-    
+
     String getPortletMode();
-    
+
     String getWindowState();
 
-    String determineActionURL(String action, String namespace, String method, 
HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, 
Map parameters, String scheme, boolean includeContext, boolean encode, boolean 
forceAddSchemeHostAndPort, boolean escapeAmp);
-    
+    String determineActionURL(String action, String namespace, String method, 
HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, 
Map<String, ?> parameters, String scheme, boolean includeContext, boolean 
encode, boolean forceAddSchemeHostAndPort, boolean escapeAmp);
+
     String determineNamespace(String namespace, ValueStack stack, 
HttpServletRequest req);
 
     String getAnchor();
-    
+
     String getPortletUrlType();
-    
+
     ValueStack getStack();
 
     void setUrlIncludeParams(String urlIncludeParams);
diff --git 
a/core/src/main/java/org/apache/struts2/config/StrutsBeanSelectionProvider.java 
b/core/src/main/java/org/apache/struts2/config/StrutsBeanSelectionProvider.java
index 15b79f09b..06385f28f 100644
--- 
a/core/src/main/java/org/apache/struts2/config/StrutsBeanSelectionProvider.java
+++ 
b/core/src/main/java/org/apache/struts2/config/StrutsBeanSelectionProvider.java
@@ -66,7 +66,8 @@ import org.apache.struts2.dispatcher.DispatcherErrorHandler;
 import org.apache.struts2.dispatcher.StaticContentLoader;
 import org.apache.struts2.dispatcher.mapper.ActionMapper;
 import org.apache.struts2.dispatcher.multipart.MultiPartRequest;
-import org.apache.struts2.url.ParametersStringBuilder;
+import org.apache.struts2.url.QueryStringBuilder;
+import org.apache.struts2.url.QueryStringParser;
 import org.apache.struts2.url.UrlDecoder;
 import org.apache.struts2.url.UrlEncoder;
 import org.apache.struts2.util.ContentTypeMatcher;
@@ -432,7 +433,8 @@ public class StrutsBeanSelectionProvider extends 
AbstractBeanSelectionProvider {
         alias(ExpressionCacheFactory.class, 
StrutsConstants.STRUTS_OGNL_EXPRESSION_CACHE_FACTORY, builder, props, 
Scope.SINGLETON);
         alias(BeanInfoCacheFactory.class, 
StrutsConstants.STRUTS_OGNL_BEANINFO_CACHE_FACTORY, builder, props, 
Scope.SINGLETON);
 
-        alias(ParametersStringBuilder.class, 
StrutsConstants.STRUTS_URL_PARAMETERS_STRING_BUILDER, builder, props, 
Scope.SINGLETON);
+        alias(QueryStringBuilder.class, 
StrutsConstants.STRUTS_URL_QUERY_STRING_BUILDER, builder, props, 
Scope.SINGLETON);
+        alias(QueryStringParser.class, 
StrutsConstants.STRUTS_URL_QUERY_STRING_PARSER, builder, props, 
Scope.SINGLETON);
         alias(UrlEncoder.class, StrutsConstants.STRUTS_URL_ENCODER, builder, 
props, Scope.SINGLETON);
         alias(UrlDecoder.class, StrutsConstants.STRUTS_URL_DECODER, builder, 
props, Scope.SINGLETON);
 
diff --git 
a/core/src/main/java/org/apache/struts2/result/ServletDispatcherResult.java 
b/core/src/main/java/org/apache/struts2/result/ServletDispatcherResult.java
index f29a771ed..a3bbfaf97 100644
--- a/core/src/main/java/org/apache/struts2/result/ServletDispatcherResult.java
+++ b/core/src/main/java/org/apache/struts2/result/ServletDispatcherResult.java
@@ -27,7 +27,7 @@ import org.apache.logging.log4j.Logger;
 import org.apache.struts2.ServletActionContext;
 import org.apache.struts2.StrutsStatics;
 import org.apache.struts2.dispatcher.HttpParameters;
-import org.apache.struts2.views.util.UrlHelper;
+import org.apache.struts2.url.QueryStringParser;
 
 import javax.servlet.RequestDispatcher;
 import javax.servlet.http.HttpServletRequest;
@@ -66,7 +66,7 @@ import java.util.Map;
  * <!-- END SNIPPET: description -->
  *
  * <p><b>This result type takes the following parameters:</b></p>
- *
+ * <p>
  * <!-- START SNIPPET: params -->
  *
  * <ul>
@@ -76,7 +76,7 @@ import java.util.Map;
  * <li><b>parse</b> - true by default. If set to false, the location param 
will not be parsed for Ognl expressions.</li>
  *
  * </ul>
- *
+ * <p>
  * <!-- END SNIPPET: params -->
  *
  * <p><b>Example:</b></p>
@@ -99,7 +99,7 @@ public class ServletDispatcherResult extends 
StrutsResultSupport {
 
     private static final Logger LOG = 
LogManager.getLogger(ServletDispatcherResult.class);
 
-    private UrlHelper urlHelper;
+    private QueryStringParser queryStringParser;
 
     public ServletDispatcherResult() {
         super();
@@ -110,8 +110,8 @@ public class ServletDispatcherResult extends 
StrutsResultSupport {
     }
 
     @Inject
-    public void setUrlHelper(UrlHelper urlHelper) {
-        this.urlHelper = urlHelper;
+    public void setQueryStringParser(QueryStringParser queryStringParser) {
+        this.queryStringParser = queryStringParser;
     }
 
     /**
@@ -140,7 +140,7 @@ public class ServletDispatcherResult extends 
StrutsResultSupport {
             if (StringUtils.isNotEmpty(finalLocation) && 
finalLocation.indexOf('?') > 0) {
                 String queryString = 
finalLocation.substring(finalLocation.indexOf('?') + 1);
                 HttpParameters parameters = getParameters(invocation);
-                Map<String, Object> queryParams = 
urlHelper.parseQueryString(queryString, true);
+                Map<String, Object> queryParams = 
queryStringParser.parse(queryString, true);
                 if (queryParams != null && !queryParams.isEmpty()) {
                     parameters = 
HttpParameters.create(queryParams).withParent(parameters).build();
                     
invocation.getInvocationContext().setParameters(parameters);
diff --git 
a/core/src/main/java/org/apache/struts2/result/ServletRedirectResult.java 
b/core/src/main/java/org/apache/struts2/result/ServletRedirectResult.java
index d59214b23..00d5b5203 100644
--- a/core/src/main/java/org/apache/struts2/result/ServletRedirectResult.java
+++ b/core/src/main/java/org/apache/struts2/result/ServletRedirectResult.java
@@ -29,7 +29,7 @@ import org.apache.logging.log4j.Logger;
 import org.apache.struts2.dispatcher.Dispatcher;
 import org.apache.struts2.dispatcher.mapper.ActionMapper;
 import org.apache.struts2.dispatcher.mapper.ActionMapping;
-import org.apache.struts2.views.util.UrlHelper;
+import org.apache.struts2.url.QueryStringBuilder;
 
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
@@ -54,7 +54,7 @@ import static javax.servlet.http.HttpServletResponse.SC_FOUND;
  * available. This is because actions are built on a single-thread model. The
  * only way to pass data is through the session or with web parameters
  * (url?name=value) which can be OGNL expressions.
- *
+ * <p>
  * <b>This result type takes the following parameters:</b>
  *
  * <ul>
@@ -65,7 +65,7 @@ import static javax.servlet.http.HttpServletResponse.SC_FOUND;
  * "hash".  You can specify an anchor for a result.</li>
  * </ul>
  * This result follows the same rules from {@link StrutsResultSupport}.
- *
+ * <p>
  * <b>Example:</b>
  * <pre>
  * <!-- START SNIPPET: example -->
@@ -94,7 +94,7 @@ public class ServletRedirectResult extends 
StrutsResultSupport implements Reflec
     protected Map<String, Object> requestParameters = new LinkedHashMap<>();
     protected String anchor;
 
-    private UrlHelper urlHelper;
+    private QueryStringBuilder queryStringBuilder;
 
     public ServletRedirectResult() {
         super();
@@ -115,8 +115,8 @@ public class ServletRedirectResult extends 
StrutsResultSupport implements Reflec
     }
 
     @Inject
-    public void setUrlHelper(UrlHelper urlHelper) {
-        this.urlHelper = urlHelper;
+    public void setQueryStringBuilder(QueryStringBuilder queryStringBuilder) {
+        this.queryStringBuilder = queryStringBuilder;
     }
 
     public void setStatusCode(int code) {
@@ -202,7 +202,7 @@ public class ServletRedirectResult extends 
StrutsResultSupport implements Reflec
         }
 
         StringBuilder tmpLocation = new StringBuilder(finalLocation);
-        urlHelper.buildParametersString(requestParameters, tmpLocation, "&");
+        queryStringBuilder.build(requestParameters, tmpLocation, "&");
 
         // add the anchor
         if (anchor != null) {
@@ -283,10 +283,7 @@ public class ServletRedirectResult extends 
StrutsResultSupport implements Reflec
                 LOG.debug("[{}] isn't absolute URI, assuming it's a path", 
url);
                 return true;
             }
-        } catch (IllegalArgumentException e) {
-            LOG.debug("[{}] isn't a valid URL, assuming it's a path", url, e);
-            return true;
-        } catch (MalformedURLException e) {
+        } catch (IllegalArgumentException | MalformedURLException e) {
             LOG.debug("[{}] isn't a valid URL, assuming it's a path", url, e);
             return true;
         }
diff --git 
a/core/src/main/java/org/apache/struts2/url/ParametersStringBuilder.java 
b/core/src/main/java/org/apache/struts2/url/QueryStringBuilder.java
similarity index 63%
copy from core/src/main/java/org/apache/struts2/url/ParametersStringBuilder.java
copy to core/src/main/java/org/apache/struts2/url/QueryStringBuilder.java
index 651c46ddb..17e2775c2 100644
--- a/core/src/main/java/org/apache/struts2/url/ParametersStringBuilder.java
+++ b/core/src/main/java/org/apache/struts2/url/QueryStringBuilder.java
@@ -18,14 +18,21 @@
  */
 package org.apache.struts2.url;
 
+import java.io.Serializable;
 import java.util.Map;
 
 /**
- * A builder used to create a proper query string out of a set of parameters
+ * A builder used to create a proper Query String out of a set of parameters
  * @since Struts 6.1.0
  */
-public interface ParametersStringBuilder {
+public interface QueryStringBuilder extends Serializable {
 
-    void buildParametersString(Map<String, Object> params, StringBuilder link, 
String paramSeparator);
+    /**
+     * Builds a Query String with defined separator and appends it to the 
provided link
+     * @param params a Map used to build a Query String
+     * @param link to which the Query String should be added
+     * @param paramSeparator used to separate parameters in query string
+     */
+    void build(Map<String, Object> params, StringBuilder link, String 
paramSeparator);
 
 }
diff --git 
a/core/src/main/java/org/apache/struts2/url/ParametersStringBuilder.java 
b/core/src/main/java/org/apache/struts2/url/QueryStringParser.java
similarity index 80%
rename from 
core/src/main/java/org/apache/struts2/url/ParametersStringBuilder.java
rename to core/src/main/java/org/apache/struts2/url/QueryStringParser.java
index 651c46ddb..0f48cd293 100644
--- a/core/src/main/java/org/apache/struts2/url/ParametersStringBuilder.java
+++ b/core/src/main/java/org/apache/struts2/url/QueryStringParser.java
@@ -18,14 +18,15 @@
  */
 package org.apache.struts2.url;
 
+import java.io.Serializable;
 import java.util.Map;
 
 /**
- * A builder used to create a proper query string out of a set of parameters
+ * Used to parse Http Query String into a Map of parameters
  * @since Struts 6.1.0
  */
-public interface ParametersStringBuilder {
+public interface QueryStringParser extends Serializable {
 
-    void buildParametersString(Map<String, Object> params, StringBuilder link, 
String paramSeparator);
+    Map<String, Object> parse(String queryString, boolean forceValueArray);
 
 }
diff --git 
a/core/src/main/java/org/apache/struts2/url/StrutsParametersStringBuilder.java 
b/core/src/main/java/org/apache/struts2/url/StrutsQueryStringBuilder.java
similarity index 91%
rename from 
core/src/main/java/org/apache/struts2/url/StrutsParametersStringBuilder.java
rename to 
core/src/main/java/org/apache/struts2/url/StrutsQueryStringBuilder.java
index e6e38f451..ea5dca84d 100644
--- 
a/core/src/main/java/org/apache/struts2/url/StrutsParametersStringBuilder.java
+++ b/core/src/main/java/org/apache/struts2/url/StrutsQueryStringBuilder.java
@@ -24,19 +24,19 @@ import org.apache.logging.log4j.Logger;
 
 import java.util.Map;
 
-public class StrutsParametersStringBuilder implements ParametersStringBuilder {
+public class StrutsQueryStringBuilder implements QueryStringBuilder {
 
-    private static final Logger LOG = 
LogManager.getLogger(StrutsParametersStringBuilder.class);
+    private static final Logger LOG = 
LogManager.getLogger(StrutsQueryStringBuilder.class);
 
     private final UrlEncoder encoder;
 
     @Inject
-    public StrutsParametersStringBuilder(UrlEncoder encoder) {
+    public StrutsQueryStringBuilder(UrlEncoder encoder) {
         this.encoder = encoder;
     }
 
     @Override
-    public void buildParametersString(Map<String, Object> params, 
StringBuilder link, String paramSeparator) {
+    public void build(Map<String, Object> params, StringBuilder link, String 
paramSeparator) {
         if ((params != null) && (params.size() > 0)) {
             LOG.debug("Building query string out of: {} parameters", 
params.size());
             StringBuilder queryString = new StringBuilder();
diff --git 
a/core/src/main/java/org/apache/struts2/url/StrutsQueryStringParser.java 
b/core/src/main/java/org/apache/struts2/url/StrutsQueryStringParser.java
new file mode 100644
index 000000000..f1764511e
--- /dev/null
+++ b/core/src/main/java/org/apache/struts2/url/StrutsQueryStringParser.java
@@ -0,0 +1,98 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.struts2.url;
+
+import com.opensymphony.xwork2.inject.Inject;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+public class StrutsQueryStringParser implements QueryStringParser {
+
+    private static final Logger LOG = 
LogManager.getLogger(StrutsQueryStringParser.class);
+
+    private final UrlDecoder decoder;
+
+    @Inject
+    public StrutsQueryStringParser(UrlDecoder decoder) {
+        this.decoder = decoder;
+    }
+
+    @Override
+    public Map<String, Object> parse(String queryString, boolean 
forceValueArray) {
+        if (StringUtils.isEmpty(queryString)) {
+            LOG.debug("Query String is empty, returning an empty map");
+            return Collections.emptyMap();
+        }
+
+        Map<String, Object> queryParams = new LinkedHashMap<>();
+        String[] params = queryString.split("&");
+        for (String param : params) {
+            if (StringUtils.isBlank(param)) {
+                LOG.debug("Param [{}] is blank, skipping", param);
+                continue;
+            }
+
+            String[] tmpParams = param.split("=");
+            String paramName = null;
+            String paramValue = "";
+            if (tmpParams.length > 0) {
+                paramName = tmpParams[0];
+            }
+            if (tmpParams.length > 1) {
+                paramValue = tmpParams[1];
+            }
+            if (paramName != null) {
+                extractParam(paramName, paramValue, queryParams, 
forceValueArray);
+            }
+        }
+        return queryParams;
+    }
+
+    private void extractParam(String paramName, String paramValue, Map<String, 
Object> queryParams, boolean forceValueArray) {
+        String decodedParamName = decoder.decode(paramName, true);
+        String decodedParamValue = decoder.decode(paramValue, true);
+
+        if (queryParams.containsKey(decodedParamName) || forceValueArray) {
+            // WW-1619 append new param value to existing value(s)
+            Object currentParam = queryParams.get(decodedParamName);
+            if (currentParam instanceof String) {
+                queryParams.put(decodedParamName, new String[]{(String) 
currentParam, decodedParamValue});
+            } else {
+                String[] currentParamValues = (String[]) currentParam;
+                if (currentParamValues != null) {
+                    List<String> paramList = new 
ArrayList<>(Arrays.asList(currentParamValues));
+                    paramList.add(decodedParamValue);
+                    queryParams.put(decodedParamName, paramList.toArray(new 
String[0]));
+                } else {
+                    queryParams.put(decodedParamName, new 
String[]{decodedParamValue});
+                }
+            }
+        } else {
+            queryParams.put(decodedParamName, decodedParamValue);
+        }
+    }
+}
diff --git a/core/src/main/java/org/apache/struts2/url/UrlDecoder.java 
b/core/src/main/java/org/apache/struts2/url/UrlDecoder.java
index b54c563f5..d2fed954b 100644
--- a/core/src/main/java/org/apache/struts2/url/UrlDecoder.java
+++ b/core/src/main/java/org/apache/struts2/url/UrlDecoder.java
@@ -18,7 +18,13 @@
  */
 package org.apache.struts2.url;
 
-public interface UrlDecoder {
+import java.io.Serializable;
+
+/**
+ * URL Decoder used internally by Struts
+ * @since Struts 6.1.0
+ */
+public interface UrlDecoder extends Serializable {
 
     /**
      * Decodes the input using default encoding, e.g.: struts.i18n.encoding
diff --git a/core/src/main/java/org/apache/struts2/url/UrlEncoder.java 
b/core/src/main/java/org/apache/struts2/url/UrlEncoder.java
index 976645a53..ae8bf3968 100644
--- a/core/src/main/java/org/apache/struts2/url/UrlEncoder.java
+++ b/core/src/main/java/org/apache/struts2/url/UrlEncoder.java
@@ -18,7 +18,13 @@
  */
 package org.apache.struts2.url;
 
-public interface UrlEncoder {
+import java.io.Serializable;
+
+/**
+ * URL Encoder used internally by Struts
+ * @since Struts 6.1.0
+ */
+public interface UrlEncoder extends Serializable {
 
     /**
      * Encodes the input tb be used with URL using the provided encoding
diff --git 
a/core/src/main/java/org/apache/struts2/views/util/DefaultUrlHelper.java 
b/core/src/main/java/org/apache/struts2/views/util/DefaultUrlHelper.java
index 547efef11..bb072c82b 100644
--- a/core/src/main/java/org/apache/struts2/views/util/DefaultUrlHelper.java
+++ b/core/src/main/java/org/apache/struts2/views/util/DefaultUrlHelper.java
@@ -24,16 +24,13 @@ import org.apache.commons.text.StringEscapeUtils;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.apache.struts2.StrutsConstants;
-import org.apache.struts2.url.ParametersStringBuilder;
+import org.apache.struts2.url.QueryStringBuilder;
+import org.apache.struts2.url.QueryStringParser;
 import org.apache.struts2.url.UrlDecoder;
 import org.apache.struts2.url.UrlEncoder;
 
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.LinkedHashMap;
-import java.util.List;
 import java.util.Map;
 
 /**
@@ -49,7 +46,8 @@ public class DefaultUrlHelper implements UrlHelper {
     private int httpPort = DEFAULT_HTTP_PORT;
     private int httpsPort = DEFAULT_HTTPS_PORT;
 
-    private ParametersStringBuilder parametersStringBuilder;
+    private QueryStringBuilder queryStringBuilder;
+    private QueryStringParser queryStringParser;
     private UrlEncoder encoder;
     private UrlDecoder decoder;
 
@@ -74,8 +72,13 @@ public class DefaultUrlHelper implements UrlHelper {
     }
 
     @Inject
-    public void setParametersStringBuilder(ParametersStringBuilder builder) {
-        this.parametersStringBuilder = builder;
+    public void setQueryStringBuilder(QueryStringBuilder builder) {
+        this.queryStringBuilder = builder;
+    }
+
+    @Inject
+    public void setQueryStringParser(QueryStringParser queryStringParser) {
+        this.queryStringParser = queryStringParser;
     }
 
     public String buildUrl(String action, HttpServletRequest request, 
HttpServletResponse response, Map<String, Object> params) {
@@ -176,9 +179,9 @@ public class DefaultUrlHelper implements UrlHelper {
 
         //if the action was not explicitly set grab the params from the request
         if (escapeAmp) {
-            parametersStringBuilder.buildParametersString(params, link, AMP);
+            queryStringBuilder.build(params, link, AMP);
         } else {
-            parametersStringBuilder.buildParametersString(params, link, "&");
+            queryStringBuilder.build(params, link, "&");
         }
 
         String result = link.toString();
@@ -208,11 +211,11 @@ public class DefaultUrlHelper implements UrlHelper {
      * @param params a set of params to assign
      * @param link a based url
      * @param paramSeparator separator used
-     * @deprecated since Struts 6.1.0, use {@link ParametersStringBuilder} 
instead
+     * @deprecated since Struts 6.1.0, use {@link QueryStringBuilder} instead
      */
     @Deprecated
     public void buildParametersString(Map<String, Object> params, 
StringBuilder link, String paramSeparator) {
-        parametersStringBuilder.buildParametersString(params, link, 
paramSeparator);
+        queryStringBuilder.build(params, link, paramSeparator);
     }
 
     /**
@@ -269,47 +272,11 @@ public class DefaultUrlHelper implements UrlHelper {
         return decoder.decode(input, isQueryString);
     }
 
+    /**
+     * @deprecated since 6.1.0, use {@link QueryStringParser} directly, use 
{@link Inject} to inject a proper instance
+     */
+    @Deprecated
     public Map<String, Object> parseQueryString(String queryString, boolean 
forceValueArray) {
-        Map<String, Object> queryParams = new LinkedHashMap<>();
-        if (queryString != null) {
-            String[] params = queryString.split("&");
-            for (String param : params) {
-                if (param.trim().length() > 0) {
-                    String[] tmpParams = param.split("=");
-                    String paramName = null;
-                    String paramValue = "";
-                    if (tmpParams.length > 0) {
-                        paramName = tmpParams[0];
-                    }
-                    if (tmpParams.length > 1) {
-                        paramValue = tmpParams[1];
-                    }
-                    if (paramName != null) {
-                        paramName = decoder.decode(paramName, true);
-                        String translatedParamValue = 
decoder.decode(paramValue, true);
-
-                        if (queryParams.containsKey(paramName) || 
forceValueArray) {
-                            // WW-1619 append new param value to existing 
value(s)
-                            Object currentParam = queryParams.get(paramName);
-                            if (currentParam instanceof String) {
-                                queryParams.put(paramName, new 
String[]{(String) currentParam, translatedParamValue});
-                            } else {
-                                String[] currentParamValues = (String[]) 
currentParam;
-                                if (currentParamValues != null) {
-                                    List<String> paramList = new 
ArrayList<>(Arrays.asList(currentParamValues));
-                                    paramList.add(translatedParamValue);
-                                    queryParams.put(paramName, 
paramList.toArray(new String[0]));
-                                } else {
-                                    queryParams.put(paramName, new 
String[]{translatedParamValue});
-                                }
-                            }
-                        } else {
-                            queryParams.put(paramName, translatedParamValue);
-                        }
-                    }
-                }
-            }
-        }
-        return queryParams;
+        return this.queryStringParser.parse(queryString, forceValueArray);
     }
 }
diff --git a/core/src/main/java/org/apache/struts2/views/util/UrlHelper.java 
b/core/src/main/java/org/apache/struts2/views/util/UrlHelper.java
index b997a58ef..4f82d6848 100644
--- a/core/src/main/java/org/apache/struts2/views/util/UrlHelper.java
+++ b/core/src/main/java/org/apache/struts2/views/util/UrlHelper.java
@@ -18,6 +18,10 @@
  */
 package org.apache.struts2.views.util;
 
+import com.opensymphony.xwork2.inject.Inject;
+import org.apache.struts2.url.QueryStringBuilder;
+import org.apache.struts2.url.QueryStringParser;
+
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import java.util.Map;
@@ -30,14 +34,14 @@ public interface UrlHelper {
     /**
      * Default HTTP port (80).
      */
-    static final int DEFAULT_HTTP_PORT = 80;
+    int DEFAULT_HTTP_PORT = 80;
 
     /**
      * Default HTTPS port (443).
      */
-    static final int DEFAULT_HTTPS_PORT = 443;
+    int DEFAULT_HTTPS_PORT = 443;
 
-    static final String AMP = "&amp;";
+    String AMP = "&amp;";
 
     String buildUrl(String action, HttpServletRequest request, 
HttpServletResponse response, Map<String, Object> params);
 
@@ -50,8 +54,16 @@ public interface UrlHelper {
     String buildUrl(String action, HttpServletRequest request, 
HttpServletResponse response, Map<String, Object> params, String scheme,
                     boolean includeContext, boolean encodeResult, boolean 
forceAddSchemeHostAndPort, boolean escapeAmp);
 
+    /**
+     * @deprecated since Struts 6.1.0, use {@link QueryStringBuilder} instead
+     */
+    @Deprecated
     void buildParametersString(Map<String, Object> params, StringBuilder link, 
String paramSeparator);
 
+    /**
+     * @deprecated since 6.1.0, use {@link QueryStringParser} directly, use 
{@link Inject} to inject a proper instance
+     */
+    @Deprecated
     Map<String, Object> parseQueryString(String queryString, boolean 
forceValueArray);
 
 }
diff --git a/core/src/main/resources/org/apache/struts2/default.properties 
b/core/src/main/resources/org/apache/struts2/default.properties
index a57c48bea..5847db3be 100644
--- a/core/src/main/resources/org/apache/struts2/default.properties
+++ b/core/src/main/resources/org/apache/struts2/default.properties
@@ -279,10 +279,15 @@ struts.ognl.expressionMaxLength=256
 ### These formatters are using a slightly different patterns, please check 
JavaDocs of both and more details is in WW-5016
 struts.date.formatter=dateTimeFormatter
 
-### Defines which instance of ParametersStringBuilder to use, Struts provides 
just one instance:
-### - strutsParametersStringBuilder
-### The builder is used by UrlHelp to create a proper query string out of 
provided parameters map
-struts.url.parametersStringBuilder=strutsParametersStringBuilder
+### Defines which instance of QueryStringBuilder to use, Struts provides just 
one instance:
+### - strutsQueryStringBuilder
+### The builder is used by UrlHelp to create a proper Query String out of 
provided parameters map
+struts.url.queryStringBuilder=strutsQueryStringBuilder
+
+### Defines which instance of QueryStringParser to use, Struts provides just 
one instance:
+### - strutsQueryStringParser
+### The parser is used to parse Query String into a map
+struts.url.queryStringParser=strutsQueryStringParser
 
 ### Defines which instances of encoder and decoder to use, Struts provides one 
default implementation for each
 struts.url.encoder=strutsUrlEncoder
diff --git a/core/src/main/resources/struts-default.xml 
b/core/src/main/resources/struts-default.xml
index 35b5bf419..fc6e1c54c 100644
--- a/core/src/main/resources/struts-default.xml
+++ b/core/src/main/resources/struts-default.xml
@@ -313,8 +313,10 @@
     <bean type="com.opensymphony.xwork2.ognl.BeanInfoCacheFactory" 
name="struts"
           class="com.opensymphony.xwork2.ognl.DefaultOgnlBeanInfoCacheFactory" 
scope="singleton"/>
 
-    <bean type="org.apache.struts2.url.ParametersStringBuilder" 
name="strutsParametersStringBuilder"
-          class="org.apache.struts2.url.StrutsParametersStringBuilder" 
scope="singleton"/>
+    <bean type="org.apache.struts2.url.QueryStringBuilder" 
name="strutsQueryStringBuilder"
+          class="org.apache.struts2.url.StrutsQueryStringBuilder" 
scope="singleton"/>
+    <bean type="org.apache.struts2.url.QueryStringParser" 
name="strutsQueryStringParser"
+          class="org.apache.struts2.url.StrutsQueryStringParser" 
scope="singleton"/>
     <bean type="org.apache.struts2.url.UrlEncoder" name="strutsUrlEncoder"
           class="org.apache.struts2.url.StrutsUrlEncoder" scope="singleton"/>
     <bean type="org.apache.struts2.url.UrlDecoder" name="strutsUrlDecoder"
diff --git 
a/core/src/test/java/org/apache/struts2/result/ServletActionRedirectResultTest.java
 
b/core/src/test/java/org/apache/struts2/result/ServletActionRedirectResultTest.java
index 0933f8ea7..8fdf1ae30 100644
--- 
a/core/src/test/java/org/apache/struts2/result/ServletActionRedirectResultTest.java
+++ 
b/core/src/test/java/org/apache/struts2/result/ServletActionRedirectResultTest.java
@@ -29,7 +29,8 @@ import org.apache.struts2.ServletActionContext;
 import org.apache.struts2.StrutsInternalTestCase;
 import org.apache.struts2.dispatcher.mapper.ActionMapper;
 import org.apache.struts2.dispatcher.mapper.DefaultActionMapper;
-import org.apache.struts2.views.util.DefaultUrlHelper;
+import org.apache.struts2.url.StrutsQueryStringBuilder;
+import org.apache.struts2.url.StrutsUrlEncoder;
 import org.easymock.IMocksControl;
 import org.springframework.mock.web.MockHttpServletRequest;
 import org.springframework.mock.web.MockHttpServletResponse;
@@ -82,7 +83,7 @@ public class ServletActionRedirectResultTest extends 
StrutsInternalTestCase {
         result.setEncode(false);
         result.setPrependServletContext(false);
         result.setAnchor("fragment");
-        result.setUrlHelper(new DefaultUrlHelper());
+        result.setQueryStringBuilder(new StrutsQueryStringBuilder(new 
StrutsUrlEncoder()));
 
         IMocksControl control = createControl();
         ActionProxy mockActionProxy = control.createMock(ActionProxy.class);
@@ -144,7 +145,7 @@ public class ServletActionRedirectResultTest extends 
StrutsInternalTestCase {
         result.setEncode(false);
         result.setPrependServletContext(false);
         result.setAnchor("fragment");
-        result.setUrlHelper(new DefaultUrlHelper());
+        result.setQueryStringBuilder(new StrutsQueryStringBuilder(new 
StrutsUrlEncoder()));
 
         IMocksControl control = createControl();
         ActionProxy mockActionProxy = control.createMock(ActionProxy.class);
@@ -210,7 +211,7 @@ public class ServletActionRedirectResultTest extends 
StrutsInternalTestCase {
         result.setEncode(false);
         result.setPrependServletContext(false);
         result.setAnchor("fragment");
-        result.setUrlHelper(new DefaultUrlHelper());
+        result.setQueryStringBuilder(new StrutsQueryStringBuilder(new 
StrutsUrlEncoder()));
 
         IMocksControl control = createControl();
         ActionProxy mockActionProxy = control.createMock(ActionProxy.class);
@@ -264,7 +265,7 @@ public class ServletActionRedirectResultTest extends 
StrutsInternalTestCase {
         result.setEncode(false);
         result.setPrependServletContext(false);
         result.setAnchor("fragment");
-        result.setUrlHelper(new DefaultUrlHelper());
+        result.setQueryStringBuilder(new StrutsQueryStringBuilder(new 
StrutsUrlEncoder()));
 
         IMocksControl control = createControl();
         ActionProxy mockActionProxy = control.createMock(ActionProxy.class);
diff --git 
a/core/src/test/java/org/apache/struts2/result/ServletDispatcherResultTest.java 
b/core/src/test/java/org/apache/struts2/result/ServletDispatcherResultTest.java
index 4a90ae443..0f57593d6 100644
--- 
a/core/src/test/java/org/apache/struts2/result/ServletDispatcherResultTest.java
+++ 
b/core/src/test/java/org/apache/struts2/result/ServletDispatcherResultTest.java
@@ -18,29 +18,20 @@
  */
 package org.apache.struts2.result;
 
-import javax.servlet.RequestDispatcher;
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-
+import com.mockobjects.dynamic.C;
+import com.mockobjects.dynamic.Mock;
+import com.opensymphony.xwork2.ActionContext;
 import com.opensymphony.xwork2.mock.MockActionInvocation;
-import com.opensymphony.xwork2.util.ValueStack;
 import com.opensymphony.xwork2.util.ValueStackFactory;
-import ognl.Ognl;
-
 import org.apache.struts2.ServletActionContext;
 import org.apache.struts2.StrutsInternalTestCase;
 import org.apache.struts2.StrutsStatics;
 import org.apache.struts2.dispatcher.HttpParameters;
 
-import com.mockobjects.dynamic.C;
-import com.mockobjects.dynamic.Mock;
-import com.opensymphony.xwork2.ActionContext;
-import org.apache.struts2.result.ServletDispatcherResult;
-
+import javax.servlet.RequestDispatcher;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
 
-/**
- *
- */
 public class ServletDispatcherResultTest extends StrutsInternalTestCase 
implements StrutsStatics {
 
     public void testInclude() {
diff --git 
a/core/src/test/java/org/apache/struts2/result/ServletRedirectResultTest.java 
b/core/src/test/java/org/apache/struts2/result/ServletRedirectResultTest.java
index 8936783fc..2ee6478f5 100644
--- 
a/core/src/test/java/org/apache/struts2/result/ServletRedirectResultTest.java
+++ 
b/core/src/test/java/org/apache/struts2/result/ServletRedirectResultTest.java
@@ -32,8 +32,8 @@ import com.opensymphony.xwork2.util.ValueStack;
 import org.apache.struts2.ServletActionContext;
 import org.apache.struts2.StrutsInternalTestCase;
 import org.apache.struts2.StrutsStatics;
-import org.apache.struts2.dispatcher.mapper.ActionMapper;
-import org.apache.struts2.views.util.DefaultUrlHelper;
+import org.apache.struts2.url.StrutsQueryStringBuilder;
+import org.apache.struts2.url.StrutsUrlEncoder;
 import org.easymock.IMocksControl;
 import org.springframework.mock.web.MockHttpServletRequest;
 import org.springframework.mock.web.MockHttpServletResponse;
@@ -240,7 +240,7 @@ public class ServletRedirectResultTest extends 
StrutsInternalTestCase implements
         result.setEncode(false);
         result.setPrependServletContext(false);
         result.setAnchor("fragment");
-        result.setUrlHelper(new DefaultUrlHelper());
+        result.setQueryStringBuilder(new StrutsQueryStringBuilder(new 
StrutsUrlEncoder()));
 
         IMocksControl control = createControl();
         ActionProxy mockActionProxy = control.createMock(ActionProxy.class);
@@ -286,7 +286,7 @@ public class ServletRedirectResultTest extends 
StrutsInternalTestCase implements
         result.setParse(true);
         result.setEncode(false);
         result.setPrependServletContext(false);
-        result.setUrlHelper(new DefaultUrlHelper());
+        result.setQueryStringBuilder(new StrutsQueryStringBuilder(new 
StrutsUrlEncoder()));
         result.setSuppressEmptyParameters(true);
 
         IMocksControl control = createControl();
@@ -433,7 +433,7 @@ public class ServletRedirectResultTest extends 
StrutsInternalTestCase implements
         }
     }
 
-    public void testPassingNullInvocation() throws Exception{
+    public void testPassingNullInvocation() throws Exception {
         Result result = new ServletRedirectResult();
         try {
             result.execute(null);
diff --git 
a/core/src/test/java/org/apache/struts2/url/StrutsParametersStringBuilderTest.java
 b/core/src/test/java/org/apache/struts2/url/StrutsQueryStringBuilderTest.java
similarity index 88%
rename from 
core/src/test/java/org/apache/struts2/url/StrutsParametersStringBuilderTest.java
rename to 
core/src/test/java/org/apache/struts2/url/StrutsQueryStringBuilderTest.java
index 815c5ae16..b30a3b835 100644
--- 
a/core/src/test/java/org/apache/struts2/url/StrutsParametersStringBuilderTest.java
+++ 
b/core/src/test/java/org/apache/struts2/url/StrutsQueryStringBuilderTest.java
@@ -28,9 +28,9 @@ import java.util.Map;
 
 import static org.junit.Assert.assertEquals;
 
-public class StrutsParametersStringBuilderTest {
+public class StrutsQueryStringBuilderTest {
 
-    private ParametersStringBuilder builder;
+    private QueryStringBuilder builder;
 
     @Test
     public void testBuildParametersStringWithUrlHavingSomeExistingParameters() 
{
@@ -43,7 +43,7 @@ public class StrutsParametersStringBuilderTest {
 
         StringBuilder url = new 
StringBuilder("http://localhost:8080/myContext/myPage.jsp?initParam=initValue";);
 
-        builder.buildParametersString(parameters, url, UrlHelper.AMP);
+        builder.build(parameters, url, UrlHelper.AMP);
 
         assertEquals(expectedUrl, url.toString());
     }
@@ -59,7 +59,7 @@ public class StrutsParametersStringBuilderTest {
 
         StringBuilder url = new 
StringBuilder("http://localhost:8080/myContext/myPage.jsp?initParam=initValue";);
 
-        builder.buildParametersString(parameters, url, UrlHelper.AMP);
+        builder.build(parameters, url, UrlHelper.AMP);
 
         assertEquals(expectedUrl, url.toString());
     }
@@ -71,7 +71,7 @@ public class StrutsParametersStringBuilderTest {
         parameters.put("param1", new String[]{});
         parameters.put("param2", new ArrayList<>());
         StringBuilder url = new 
StringBuilder("https://www.nowhere.com/myworld.html";);
-        builder.buildParametersString(parameters, url, UrlHelper.AMP);
+        builder.build(parameters, url, UrlHelper.AMP);
         assertEquals(expectedUrl, url.toString());
     }
 
@@ -87,13 +87,13 @@ public class StrutsParametersStringBuilderTest {
             }
         });
         StringBuilder url = new 
StringBuilder("https://www.nowhere.com/myworld.html";);
-        builder.buildParametersString(parameters, url, "&");
+        builder.build(parameters, url, "&");
         assertEquals(expectedUrl, url.toString());
     }
 
     @Before
     public void setUp() throws Exception {
-        builder = new StrutsParametersStringBuilder(new StrutsUrlEncoder());
+        builder = new StrutsQueryStringBuilder(new StrutsUrlEncoder());
     }
 
 }
diff --git 
a/core/src/test/java/org/apache/struts2/url/StrutsQueryStringParserTest.java 
b/core/src/test/java/org/apache/struts2/url/StrutsQueryStringParserTest.java
new file mode 100644
index 000000000..001749edf
--- /dev/null
+++ b/core/src/test/java/org/apache/struts2/url/StrutsQueryStringParserTest.java
@@ -0,0 +1,84 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.struts2.url;
+
+import org.assertj.core.util.Arrays;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+public class StrutsQueryStringParserTest {
+
+    private QueryStringParser parser;
+
+    @Test
+    public void testParseQuery() {
+        Map<String, Object> result = 
parser.parse("aaa=aaaval&bbb=bbbval&ccc=&%3Ca%22%3E=%3Cval%3E", false);
+
+        assertEquals("aaaval", result.get("aaa"));
+        assertEquals("bbbval", result.get("bbb"));
+        assertEquals("", result.get("ccc"));
+        assertEquals("<val>", result.get("<a\">"));
+    }
+
+    @Test
+    public void testParseQueryIntoArray() {
+        Map<String, Object> result = parser.parse("a=1&a=2&a=3", true);
+
+        Object actual = result.get("a");
+        assertThat(actual).isInstanceOf(String[].class);
+        assertThat(Arrays.asList(actual)).containsOnly("1", "2", "3");
+    }
+
+    @Test
+    public void testParseEmptyQuery() {
+        Map<String, Object> result = parser.parse("", false);
+
+        assertNotNull(result);
+        assertEquals(0, result.size());
+    }
+
+    @Test
+    public void testParseNullQuery() {
+        Map<String, Object> result = parser.parse(null, false);
+
+        assertNotNull(result);
+        assertEquals(0, result.size());
+    }
+
+    @Test
+    public void testDecodeSpacesInQueryString() {
+        Map<String, Object> queryParameters = 
parser.parse("name=value+with+space", false);
+
+        assertTrue(queryParameters.containsKey("name"));
+        assertEquals("value with space", queryParameters.get("name"));
+    }
+
+    @Before
+    public void setUp() throws Exception {
+        this.parser = new StrutsQueryStringParser(new StrutsUrlDecoder());
+    }
+
+}
diff --git 
a/core/src/test/java/org/apache/struts2/views/util/DefaultUrlHelperTest.java 
b/core/src/test/java/org/apache/struts2/views/util/DefaultUrlHelperTest.java
index acbee3010..fa1c22322 100644
--- a/core/src/test/java/org/apache/struts2/views/util/DefaultUrlHelperTest.java
+++ b/core/src/test/java/org/apache/struts2/views/util/DefaultUrlHelperTest.java
@@ -23,7 +23,7 @@ import com.opensymphony.xwork2.ActionContext;
 import com.opensymphony.xwork2.inject.Container;
 import com.opensymphony.xwork2.inject.Scope.Strategy;
 import org.apache.struts2.StrutsInternalTestCase;
-import org.apache.struts2.url.StrutsParametersStringBuilder;
+import org.apache.struts2.url.StrutsQueryStringBuilder;
 import org.apache.struts2.url.StrutsUrlDecoder;
 import org.apache.struts2.url.StrutsUrlEncoder;
 
@@ -339,45 +339,13 @@ public class DefaultUrlHelperTest extends 
StrutsInternalTestCase {
         assertEquals(expectedString, urlString);
     }
 
-
-    public void testParseQuery() {
-        Map<String, Object> result = 
urlHelper.parseQueryString("aaa=aaaval&bbb=bbbval&ccc=&%3Ca%22%3E=%3Cval%3E", 
false);
-
-        assertEquals(result.get("aaa"), "aaaval");
-        assertEquals(result.get("bbb"), "bbbval");
-        assertEquals(result.get("ccc"), "");
-        assertEquals(result.get("<a\">"), "<val>");
-    }
-
-    public void testParseEmptyQuery() {
-        Map<String, Object> result = urlHelper.parseQueryString("", false);
-
-        assertNotNull(result);
-        assertEquals(result.size(), 0);
-    }
-
-    public void testParseNullQuery() {
-        Map<String, Object> result = urlHelper.parseQueryString(null, false);
-
-        assertNotNull(result);
-        assertEquals(result.size(), 0);
-    }
-
-    public void testDecodeSpacesInQueryString() {
-        Map<String, Object> queryParameters = 
urlHelper.parseQueryString("name=value+with+space", false);
-
-        assertTrue(queryParameters.containsKey("name"));
-        assertEquals("value with space", queryParameters.get("name"));
-    }
-
-
     public void setUp() throws Exception {
         super.setUp();
         StubContainer stubContainer = new StubContainer(container);
         ActionContext.getContext().withContainer(stubContainer);
         urlHelper = new DefaultUrlHelper();
         StrutsUrlEncoder encoder = new StrutsUrlEncoder();
-        urlHelper.setParametersStringBuilder(new 
StrutsParametersStringBuilder(encoder));
+        urlHelper.setQueryStringBuilder(new StrutsQueryStringBuilder(encoder));
         urlHelper.setEncoder(encoder);
         urlHelper.setDecoder(new StrutsUrlDecoder());
     }
diff --git 
a/plugins/embeddedjsp/src/main/java/org/apache/struts2/JSPRuntime.java 
b/plugins/embeddedjsp/src/main/java/org/apache/struts2/JSPRuntime.java
index 81bbed490..d9425bbb6 100644
--- a/plugins/embeddedjsp/src/main/java/org/apache/struts2/JSPRuntime.java
+++ b/plugins/embeddedjsp/src/main/java/org/apache/struts2/JSPRuntime.java
@@ -20,8 +20,7 @@ package org.apache.struts2;
 
 import com.opensymphony.xwork2.ActionContext;
 import org.apache.struts2.dispatcher.Parameter;
-import org.apache.struts2.views.util.DefaultUrlHelper;
-import org.apache.struts2.views.util.UrlHelper;
+import org.apache.struts2.url.QueryStringParser;
 
 import javax.servlet.Servlet;
 import javax.servlet.http.HttpServletRequest;
@@ -53,11 +52,13 @@ public abstract class JSPRuntime {
         int i = location.indexOf("?");
         if (i > 0) {
             //extract params from the url and add them to the request
-            final UrlHelper urlHelperGetInstance = 
ServletActionContext.getContext().getInstance(UrlHelper.class);
-            final UrlHelper contextUrlHelper = (urlHelperGetInstance != null ? 
urlHelperGetInstance : (UrlHelper) 
ActionContext.getContext().get(StrutsConstants.STRUTS_URL_HELPER));
-            final UrlHelper urlHelper = (contextUrlHelper != null ? 
contextUrlHelper : new DefaultUrlHelper());
+            ActionContext actionContext = 
ServletActionContext.getActionContext();
+            if (actionContext == null) {
+                throw new StrutsException("Running out of action context!");
+            }
+            final QueryStringParser parser = 
actionContext.getInstance(QueryStringParser.class);
             String query = location.substring(i + 1);
-            Map<String, Object> queryParams = 
urlHelper.parseQueryString(query, true);
+            Map<String, Object> queryParams = parser.parse(query, true);
             if (queryParams != null && !queryParams.isEmpty()) {
                 Map<String, Parameter> newParams = new HashMap<>();
                 for (Map.Entry<String, Object> entry : queryParams.entrySet()) 
{
diff --git 
a/plugins/embeddedjsp/src/test/java/org/apache/struts2/EmbeddedJSPResultTest.java
 
b/plugins/embeddedjsp/src/test/java/org/apache/struts2/EmbeddedJSPResultTest.java
index 6cde3f7d6..4a8eee285 100644
--- 
a/plugins/embeddedjsp/src/test/java/org/apache/struts2/EmbeddedJSPResultTest.java
+++ 
b/plugins/embeddedjsp/src/test/java/org/apache/struts2/EmbeddedJSPResultTest.java
@@ -35,10 +35,9 @@ import junit.framework.TestCase;
 import org.apache.commons.lang3.StringUtils;
 import org.apache.struts2.dispatcher.HttpParameters;
 import org.apache.struts2.jasper.runtime.InstanceHelper;
+import org.apache.struts2.url.QueryStringParser;
+import org.apache.struts2.url.StrutsQueryStringParser;
 import org.apache.struts2.url.StrutsUrlDecoder;
-import org.apache.struts2.url.StrutsUrlEncoder;
-import org.apache.struts2.views.util.DefaultUrlHelper;
-import org.apache.struts2.views.util.UrlHelper;
 import org.apache.tomcat.InstanceManager;
 import org.easymock.EasyMock;
 import org.springframework.mock.web.MockHttpServletRequest;
@@ -58,6 +57,8 @@ import java.util.Map;
 import java.util.concurrent.BrokenBarrierException;
 import java.util.concurrent.CyclicBarrier;
 
+import static org.apache.struts2.ServletActionContext.STRUTS_VALUESTACK_KEY;
+
 
 public class EmbeddedJSPResultTest extends TestCase {
     private HttpServletRequest request;
@@ -324,18 +325,19 @@ public class EmbeddedJSPResultTest extends TestCase {
         HttpSession session = EasyMock.createNiceMock(HttpSession.class);
         EasyMock.replay(session);
 
+        //mock value stack
+        ValueStack valueStack = EasyMock.createNiceMock(ValueStack.class);
+        
EasyMock.expect(valueStack.getActionContext()).andReturn(ActionContext.getContext()).anyTimes();
+        EasyMock.replay(valueStack);
+
         EasyMock.expect(request.getSession()).andReturn(session).anyTimes();
         
EasyMock.expect(request.getParameterMap()).andReturn(params).anyTimes();
         EasyMock.expect(request.getParameter("username")).andAnswer(() -> 
ActionContext.getContext().getParameters().get("username").getValue());
+        
EasyMock.expect(request.getAttribute(STRUTS_VALUESTACK_KEY)).andReturn(valueStack).anyTimes();
         
EasyMock.expect(request.getAttribute("something")).andReturn("somethingelse").anyTimes();
 
         EasyMock.replay(request);
 
-        //mock value stack
-        ValueStack valueStack = EasyMock.createNiceMock(ValueStack.class);
-        
EasyMock.expect(valueStack.getActionContext()).andReturn(ActionContext.getContext()).anyTimes();
-        EasyMock.replay(valueStack);
-
         //mock converter
         XWorkConverter converter = new DummyConverter();
 
@@ -350,10 +352,8 @@ public class EmbeddedJSPResultTest extends TestCase {
         
EasyMock.expect(container.getInstanceNames(FileManager.class)).andReturn(new 
HashSet<>()).anyTimes();
         
EasyMock.expect(container.getInstance(FileManager.class)).andReturn(fileManager).anyTimes();
 
-        DefaultUrlHelper urlHelper = new DefaultUrlHelper();
-        urlHelper.setDecoder(new StrutsUrlDecoder());
-        urlHelper.setEncoder(new StrutsUrlEncoder());
-        
EasyMock.expect(container.getInstance(UrlHelper.class)).andReturn(urlHelper).anyTimes();
+        QueryStringParser queryStringParser = new StrutsQueryStringParser(new 
StrutsUrlDecoder());
+        
EasyMock.expect(container.getInstance(QueryStringParser.class)).andReturn(queryStringParser).anyTimes();
         FileManagerFactory fileManagerFactory = new DummyFileManagerFactory();
         
EasyMock.expect(container.getInstance(FileManagerFactory.class)).andReturn(fileManagerFactory).anyTimes();
 
diff --git 
a/plugins/json/src/test/java/org/apache/struts2/json/JSONActionRedirectResultTest.java
 
b/plugins/json/src/test/java/org/apache/struts2/json/JSONActionRedirectResultTest.java
index 268ee6087..24dc6adf5 100644
--- 
a/plugins/json/src/test/java/org/apache/struts2/json/JSONActionRedirectResultTest.java
+++ 
b/plugins/json/src/test/java/org/apache/struts2/json/JSONActionRedirectResultTest.java
@@ -26,10 +26,9 @@ import com.opensymphony.xwork2.util.ValueStack;
 import org.apache.struts2.StrutsStatics;
 import org.apache.struts2.dispatcher.mapper.DefaultActionMapper;
 import org.apache.struts2.junit.StrutsTestCase;
-import org.apache.struts2.url.StrutsParametersStringBuilder;
-import org.apache.struts2.url.StrutsUrlDecoder;
+import org.apache.struts2.url.QueryStringBuilder;
+import org.apache.struts2.url.StrutsQueryStringBuilder;
 import org.apache.struts2.url.StrutsUrlEncoder;
-import org.apache.struts2.views.util.DefaultUrlHelper;
 import org.springframework.mock.web.MockHttpServletRequest;
 import org.springframework.mock.web.MockHttpServletResponse;
 import org.springframework.mock.web.MockServletContext;
@@ -37,7 +36,7 @@ import org.springframework.mock.web.MockServletContext;
 public class JSONActionRedirectResultTest extends StrutsTestCase {
 
     private DefaultActionMapper actionMapper;
-    private DefaultUrlHelper urlHelper;
+    private QueryStringBuilder queryStringBuilder;
 
     MockActionInvocation invocation;
     MockHttpServletResponse response;
@@ -50,7 +49,7 @@ public class JSONActionRedirectResultTest extends 
StrutsTestCase {
         JSONActionRedirectResult result = new JSONActionRedirectResult();
         result.setActionName("targetAction");
         result.setActionMapper(actionMapper);
-        result.setUrlHelper(urlHelper);
+        result.setQueryStringBuilder(queryStringBuilder);
 
         Object action = new Object();
         stack.push(action);
@@ -69,7 +68,7 @@ public class JSONActionRedirectResultTest extends 
StrutsTestCase {
         JSONActionRedirectResult result = new JSONActionRedirectResult();
         result.setActionName("targetAction");
         result.setActionMapper(actionMapper);
-        result.setUrlHelper(urlHelper);
+        result.setQueryStringBuilder(queryStringBuilder);
 
         request.setParameter("struts.enableJSONValidation", "true");
         request.setParameter("struts.validateOnly", "false");
@@ -89,7 +88,7 @@ public class JSONActionRedirectResultTest extends 
StrutsTestCase {
         JSONActionRedirectResult result = new JSONActionRedirectResult();
         result.setActionName("targetAction");
         result.setActionMapper(actionMapper);
-        result.setUrlHelper(urlHelper);
+        result.setQueryStringBuilder(queryStringBuilder);
 
         request.setParameter("struts.enableJSONValidation", "true");
         request.setParameter("struts.validateOnly", "true");
@@ -126,10 +125,6 @@ public class JSONActionRedirectResultTest extends 
StrutsTestCase {
         this.invocation.setProxy(mockActionProxy);
 
         this.actionMapper = new DefaultActionMapper();
-        this.urlHelper = new DefaultUrlHelper();
-        StrutsUrlEncoder encoder = new StrutsUrlEncoder();
-        this.urlHelper.setParametersStringBuilder(new 
StrutsParametersStringBuilder(encoder));
-        this.urlHelper.setEncoder(encoder);
-        this.urlHelper.setDecoder(new StrutsUrlDecoder());
+        this.queryStringBuilder = new StrutsQueryStringBuilder(new 
StrutsUrlEncoder());
     }
 }
diff --git 
a/plugins/portlet/src/main/java/org/apache/struts2/components/PortletUrlRenderer.java
 
b/plugins/portlet/src/main/java/org/apache/struts2/components/PortletUrlRenderer.java
index a286deb3e..754389f83 100644
--- 
a/plugins/portlet/src/main/java/org/apache/struts2/components/PortletUrlRenderer.java
+++ 
b/plugins/portlet/src/main/java/org/apache/struts2/components/PortletUrlRenderer.java
@@ -18,7 +18,6 @@
  */
 package org.apache.struts2.components;
 
-import com.opensymphony.xwork2.ActionContext;
 import com.opensymphony.xwork2.ActionInvocation;
 import com.opensymphony.xwork2.inject.Inject;
 import org.apache.commons.lang3.StringUtils;
@@ -27,6 +26,7 @@ import org.apache.struts2.dispatcher.mapper.ActionMapper;
 import org.apache.struts2.portlet.context.PortletActionContext;
 import org.apache.struts2.portlet.util.PortletUrlHelper;
 import org.apache.struts2.portlet.util.PortletUrlHelperJSR286;
+import org.apache.struts2.url.QueryStringParser;
 import org.apache.struts2.views.util.UrlHelper;
 
 import javax.portlet.PortletMode;
@@ -66,6 +66,11 @@ public class PortletUrlRenderer implements UrlRenderer {
         servletRenderer.setUrlHelper(urlHelper);
     }
 
+    @Inject
+    public void setQueryStringParser(QueryStringParser queryStringParser) {
+        this.servletRenderer.setQueryStringParser(queryStringParser);
+    }
+
     /**
      * {@inheritDoc}
      */
@@ -75,37 +80,35 @@ public class PortletUrlRenderer implements UrlRenderer {
             return;
         }
         String result;
-        if 
(isPortletModeChange(urlComponent,PortletActionContext.getRequest().getPortletMode())
-                       && StringUtils.isEmpty(urlComponent.getNamespace()))
-        {
-               String mode = urlComponent.getPortletMode();
-               PortletMode portletMode = new PortletMode(mode);
-               String action = urlComponent.getAction();
-               if (StringUtils.isEmpty(action)) {
-                       action = 
PortletActionContext.getModeActionMap().get(portletMode).getName();
-               }
-               String modeNamespace = 
PortletActionContext.getModeNamespaceMap().get(portletMode);
-               result = portletUrlHelper.buildUrl(action, modeNamespace, 
urlComponent.getMethod(),
-                               urlComponent.getParameters(), 
urlComponent.getPortletUrlType(), mode, urlComponent.getWindowState());
+        if (isPortletModeChange(urlComponent, 
PortletActionContext.getRequest().getPortletMode())
+            && StringUtils.isEmpty(urlComponent.getNamespace())) {
+            String mode = urlComponent.getPortletMode();
+            PortletMode portletMode = new PortletMode(mode);
+            String action = urlComponent.getAction();
+            if (StringUtils.isEmpty(action)) {
+                action = 
PortletActionContext.getModeActionMap().get(portletMode).getName();
+            }
+            String modeNamespace = 
PortletActionContext.getModeNamespaceMap().get(portletMode);
+            result = portletUrlHelper.buildUrl(action, modeNamespace, 
urlComponent.getMethod(),
+                urlComponent.getParameters(), 
urlComponent.getPortletUrlType(), mode, urlComponent.getWindowState());
 
         } else {
-               String namespace = 
urlComponent.determineNamespace(urlComponent.getNamespace(), 
urlComponent.getStack(), urlComponent.getHttpServletRequest());
-               urlComponent.setNamespace(namespace);
-               if (onlyActionSpecified(urlComponent)) {
-                   if (StringUtils.isNotEmpty(urlComponent.getAction())) {
-                       String action = 
urlComponent.findString(urlComponent.getAction());
+            String namespace = 
urlComponent.determineNamespace(urlComponent.getNamespace(), 
urlComponent.getStack(), urlComponent.getHttpServletRequest());
+            urlComponent.setNamespace(namespace);
+            if (onlyActionSpecified(urlComponent)) {
+                if (StringUtils.isNotEmpty(urlComponent.getAction())) {
+                    String action = 
urlComponent.findString(urlComponent.getAction());
                     result = portletUrlHelper.buildUrl(action, 
urlComponent.getNamespace(), urlComponent.getMethod(),
-                                    urlComponent.getParameters(), 
urlComponent.getPortletUrlType(), urlComponent.getPortletMode(), 
urlComponent.getWindowState());
-                   }
-                   else {
+                        urlComponent.getParameters(), 
urlComponent.getPortletUrlType(), urlComponent.getPortletMode(), 
urlComponent.getWindowState());
+                } else {
                     result = 
portletUrlHelper.buildUrl(urlComponent.getAction(), 
urlComponent.getNamespace(), urlComponent.getMethod(),
-                                    urlComponent.getParameters(), 
urlComponent.getPortletUrlType(), urlComponent.getPortletMode(), 
urlComponent.getWindowState());
-                   }
-               } else if (onlyValueSpecified(urlComponent)) {
-                       result = 
portletUrlHelper.buildResourceUrl(urlComponent.getValue(), 
urlComponent.getParameters());
-               } else {
-                       result = createDefaultUrl(urlComponent);
-               }
+                        urlComponent.getParameters(), 
urlComponent.getPortletUrlType(), urlComponent.getPortletMode(), 
urlComponent.getWindowState());
+                }
+            } else if (onlyValueSpecified(urlComponent)) {
+                result = 
portletUrlHelper.buildResourceUrl(urlComponent.getValue(), 
urlComponent.getParameters());
+            } else {
+                result = createDefaultUrl(urlComponent);
+            }
         }
         String anchor = urlComponent.getAnchor();
         if (StringUtils.isNotEmpty(anchor)) {
@@ -128,19 +131,19 @@ public class PortletUrlRenderer implements UrlRenderer {
         }
     }
 
-       boolean isPortletModeChange(UrlProvider urlComponent,PortletMode 
currentMode) {
-               if (StringUtils.isNotEmpty(urlComponent.getPortletMode())) {
-                       PortletMode newPortletMode = new 
PortletMode(urlComponent.getPortletMode());
-               return !(newPortletMode.equals(currentMode));
+    boolean isPortletModeChange(UrlProvider urlComponent, PortletMode 
currentMode) {
+        if (StringUtils.isNotEmpty(urlComponent.getPortletMode())) {
+            PortletMode newPortletMode = new 
PortletMode(urlComponent.getPortletMode());
+            return !(newPortletMode.equals(currentMode));
         }
-               return false;
-       }
+        return false;
+    }
 
     private String createDefaultUrl(UrlProvider urlComponent) {
         ActionInvocation ai = 
urlComponent.getStack().getActionContext().getActionInvocation();
         String action = ai.getProxy().getActionName();
         return portletUrlHelper.buildUrl(action, urlComponent.getNamespace(), 
urlComponent.getMethod(), urlComponent.getParameters(),
-                urlComponent.getPortletUrlType(), 
urlComponent.getPortletMode(), urlComponent.getWindowState());
+            urlComponent.getPortletUrlType(), urlComponent.getPortletMode(), 
urlComponent.getWindowState());
     }
 
     private boolean onlyValueSpecified(UrlProvider urlComponent) {
@@ -160,7 +163,7 @@ public class PortletUrlRenderer implements UrlRenderer {
             return;
         }
         String namespace = 
formComponent.determineNamespace(formComponent.namespace, 
formComponent.getStack(),
-                formComponent.request);
+            formComponent.request);
         String action;
         if (formComponent.action != null) {
             action = formComponent.findString(formComponent.action);
@@ -177,7 +180,7 @@ public class PortletUrlRenderer implements UrlRenderer {
         }
         if (action != null) {
             String result = portletUrlHelper.buildUrl(action, namespace, null,
-                    formComponent.getParameters(), type, 
formComponent.portletMode, formComponent.windowState);
+                formComponent.getParameters(), type, 
formComponent.portletMode, formComponent.windowState);
             formComponent.addParameter("action", result);
 
 
diff --git 
a/plugins/portlet/src/main/java/org/apache/struts2/portlet/result/PortletActionRedirectResult.java
 
b/plugins/portlet/src/main/java/org/apache/struts2/portlet/result/PortletActionRedirectResult.java
index eaef67c0a..c970c4189 100644
--- 
a/plugins/portlet/src/main/java/org/apache/struts2/portlet/result/PortletActionRedirectResult.java
+++ 
b/plugins/portlet/src/main/java/org/apache/struts2/portlet/result/PortletActionRedirectResult.java
@@ -21,11 +21,11 @@ package org.apache.struts2.portlet.result;
 import com.opensymphony.xwork2.ActionInvocation;
 import com.opensymphony.xwork2.config.entities.ResultConfig;
 import com.opensymphony.xwork2.inject.Inject;
-import org.apache.struts2.result.ServletActionRedirectResult;
 import org.apache.struts2.dispatcher.mapper.ActionMapper;
 import org.apache.struts2.dispatcher.mapper.ActionMapping;
 import org.apache.struts2.portlet.PortletConstants;
-import org.apache.struts2.views.util.UrlHelper;
+import org.apache.struts2.result.ServletActionRedirectResult;
+import org.apache.struts2.url.QueryStringBuilder;
 
 import javax.portlet.PortletMode;
 import java.util.Arrays;
@@ -34,11 +34,10 @@ import java.util.List;
 import java.util.Map;
 
 /**
- * 
  * Portlet modification of the {@link ServletActionRedirectResult}.
- * 
+ * <p>
  * <!-- START SNIPPET: description -->
- * 
+ * <p>
  * This result uses the {@link ActionMapper} provided by the
  * <code>ActionMapperFactory</code> to instruct the render phase to invoke the
  * specified action and (optional) namespace. This is better than the
@@ -48,31 +47,31 @@ import java.util.Map;
  * and your application will still work. It is strongly recommended that if you
  * are redirecting to another action, you use this result rather than the
  * standard redirect result.
- * 
+ * <p>
  * See examples below for an example of how request parameters could be passed
  * in.
- * 
+ * <p>
  * <!-- END SNIPPET: description -->
- * 
+ * <p>
  * <b>This result type takes the following parameters:</b>
- * 
+ * <p>
  * <!-- START SNIPPET: params -->
- * 
+ *
  * <ul>
- * 
+ *
  * <li><b>actionName (default)</b> - the name of the action that will be
  * redirect to</li>
- * 
+ *
  * <li><b>namespace</b> - used to determine which namespace the action is in
  * that we're redirecting to . If namespace is null, this defaults to the
  * current namespace</li>
- * 
+ *
  * </ul>
- * 
+ * <p>
  * <!-- END SNIPPET: params -->
- * 
+ * <p>
  * <b>Example:</b>
- * 
+ *
  * <pre>
  * &lt;!-- START SNIPPET: example --&gt;
  *  &lt;package name=&quot;public&quot; extends=&quot;struts-default&quot;&gt;
@@ -84,19 +83,19 @@ import java.util.Map;
  *          &lt;/result&gt;
  *      &lt;/action&gt;
  *  &lt;/package&gt;
- * 
+ *
  *  &lt;package name=&quot;secure&quot; extends=&quot;struts-default&quot; 
namespace=&quot;/secure&quot;&gt;
  *      &lt;-- Redirect to an action in the same namespace --&gt;
  *      &lt;action name=&quot;dashboard&quot; class=&quot;...&quot;&gt;
  *          &lt;result&gt;dashboard.jsp&lt;/result&gt;
  *          &lt;result name=&quot;error&quot; 
type=&quot;redirect-action&quot;&gt;error&lt;/result&gt;
  *      &lt;/action&gt;
- * 
+ *
  *      &lt;action name=&quot;error&quot; class=&quot;...&quot;&gt;
  *          &lt;result&gt;error.jsp&lt;/result&gt;
  *      &lt;/action&gt;
  *  &lt;/package&gt;
- * 
+ *
  *  &lt;package name=&quot;passingRequestParameters&quot; 
extends=&quot;struts-default&quot; 
namespace=&quot;/passingRequestParameters&quot;&gt;
  *     &lt;-- Pass parameters (reportType, width and height) --&gt;
  *     &lt;!--
@@ -113,106 +112,109 @@ import java.util.Map;
  *        &lt;/result&gt;
  *     &lt;/action&gt;
  *  &lt;/package&gt;
- * 
- * 
+ *
+ *
  *  &lt;!-- END SNIPPET: example --&gt;
  * </pre>
- * 
+ *
  * @see ActionMapper
  */
 public class PortletActionRedirectResult extends PortletResult {
 
-       private static final long serialVersionUID = -7627388936683562557L;
+    private static final long serialVersionUID = -7627388936683562557L;
 
-       /** The default parameter */
-       public static final String DEFAULT_PARAM = "actionName";
+    /**
+     * The default parameter
+     */
+    public static final String DEFAULT_PARAM = "actionName";
 
-       protected String actionName;
-       protected String namespace;
-       protected String method;
+    protected String actionName;
+    protected String namespace;
+    protected String method;
 
-       private Map<String, Object> requestParameters = new 
LinkedHashMap<String, Object>();
-       private ActionMapper actionMapper;
-    private UrlHelper urlHelper;
+    private final Map<String, Object> requestParameters = new 
LinkedHashMap<>();
 
-       public PortletActionRedirectResult() {
-               super();
-       }
+    private ActionMapper actionMapper;
+    private QueryStringBuilder queryStringBuilder;
 
-       public PortletActionRedirectResult(String actionName) {
-               this(null, actionName, null);
-       }
+    public PortletActionRedirectResult() {
+        super();
+    }
 
-       public PortletActionRedirectResult(String actionName, String method) {
-               this(null, actionName, method);
-       }
+    public PortletActionRedirectResult(String actionName) {
+        this(null, actionName, null);
+    }
 
-       public PortletActionRedirectResult(String namespace, String actionName, 
String method) {
-               super(null);
-               this.namespace = namespace;
-               this.actionName = actionName;
-               this.method = method;
-       }
+    public PortletActionRedirectResult(String actionName, String method) {
+        this(null, actionName, method);
+    }
 
-       protected List<String> prohibitedResultParam = 
Arrays.asList(DEFAULT_PARAM, "namespace", "method", "encode", "parse",
-            "location", "prependServletContext");
+    public PortletActionRedirectResult(String namespace, String actionName, 
String method) {
+        super(null);
+        this.namespace = namespace;
+        this.actionName = actionName;
+        this.method = method;
+    }
 
-       @Inject
-       public void setActionMapper(ActionMapper actionMapper) {
-               this.actionMapper = actionMapper;
-       }
+    protected List<String> prohibitedResultParam = 
Arrays.asList(DEFAULT_PARAM, "namespace", "method", "encode", "parse",
+        "location", "prependServletContext");
 
     @Inject
-    public void setUrlHelper(UrlHelper urlHelper) {
-        this.urlHelper = urlHelper;
+    public void setActionMapper(ActionMapper actionMapper) {
+        this.actionMapper = actionMapper;
+    }
+
+    @Inject
+    public void setQueryStringBuilder(QueryStringBuilder queryStringBuilder) {
+        this.queryStringBuilder = queryStringBuilder;
     }
 
     /**
-        * @see 
com.opensymphony.xwork2.Result#execute(com.opensymphony.xwork2.ActionInvocation)
-        */
-       public void execute(ActionInvocation invocation) throws Exception {
-               if (invocation == null) {
-                       throw new IllegalArgumentException("Invocation cannot 
be null!");
-               }
+     * @see 
com.opensymphony.xwork2.Result#execute(com.opensymphony.xwork2.ActionInvocation)
+     */
+    public void execute(ActionInvocation invocation) throws Exception {
+        if (invocation == null) {
+            throw new IllegalArgumentException("Invocation cannot be null!");
+        }
 
-               actionName = conditionalParse(actionName, invocation);
-               parseLocation = false;
+        actionName = conditionalParse(actionName, invocation);
+        parseLocation = false;
 
-               String portletNamespace = 
(String)invocation.getInvocationContext().get(PortletConstants.PORTLET_NAMESPACE);
-               if (portletMode != null) {
-                       Map<PortletMode, String> namespaceMap = 
getNamespaceMap(invocation);
-                       namespace = namespaceMap.get(portletMode);
-               }
-               if (namespace == null) {
-                       namespace = invocation.getProxy().getNamespace();
-               } else {
-                       namespace = conditionalParse(namespace, invocation);
-               }
-               if (method == null) {
-                       method = "";
-               } else {
-                       method = conditionalParse(method, invocation);
-               }
+        String portletNamespace = (String) 
invocation.getInvocationContext().get(PortletConstants.PORTLET_NAMESPACE);
+        if (portletMode != null) {
+            Map<PortletMode, String> namespaceMap = 
getNamespaceMap(invocation);
+            namespace = namespaceMap.get(portletMode);
+        }
+        if (namespace == null) {
+            namespace = invocation.getProxy().getNamespace();
+        } else {
+            namespace = conditionalParse(namespace, invocation);
+        }
+        if (method == null) {
+            method = "";
+        } else {
+            method = conditionalParse(method, invocation);
+        }
 
-               String resultCode = invocation.getResultCode();
-               if (resultCode != null) {
-                       ResultConfig resultConfig = 
invocation.getProxy().getConfig().getResults().get(resultCode);
-                       Map<String, String> resultConfigParams = 
resultConfig.getParams();
+        String resultCode = invocation.getResultCode();
+        if (resultCode != null) {
+            ResultConfig resultConfig = 
invocation.getProxy().getConfig().getResults().get(resultCode);
+            Map<String, String> resultConfigParams = resultConfig.getParams();
             for (Map.Entry<String, String> e : resultConfigParams.entrySet()) {
                 if (!prohibitedResultParam.contains(e.getKey())) {
                     requestParameters.put(e.getKey(), e.getValue() == null ? 
"" : conditionalParse(e.getValue(), invocation));
                 }
             }
-               }
+        }
 
-               StringBuilder tmpLocation = new 
StringBuilder(actionMapper.getUriFromActionMapping(new ActionMapping(actionName,
-                               (portletNamespace == null ? namespace : 
portletNamespace + namespace), method, null)));
-               urlHelper.buildParametersString(requestParameters, tmpLocation, 
"&");
+        ActionMapping actionMapping = new ActionMapping(actionName, 
(portletNamespace == null ? namespace : portletNamespace + namespace), method, 
null);
+        StringBuilder tmpLocation = new 
StringBuilder(actionMapper.getUriFromActionMapping(actionMapping));
+        queryStringBuilder.build(requestParameters, tmpLocation, "&");
 
-               setLocation(tmpLocation.toString());
+        setLocation(tmpLocation.toString());
 
-               super.execute(invocation);
-       }
+        super.execute(invocation);
+    }
 
     @SuppressWarnings("unchecked")
     private Map<PortletMode, String> getNamespaceMap(ActionInvocation 
invocation) {
@@ -220,43 +222,42 @@ public class PortletActionRedirectResult extends 
PortletResult {
     }
 
     /**
-        * Sets the action name
-        * 
-        * @param actionName The name
-        */
-       public void setActionName(String actionName) {
-               this.actionName = actionName;
-       }
+     * Sets the action name
+     *
+     * @param actionName The name
+     */
+    public void setActionName(String actionName) {
+        this.actionName = actionName;
+    }
 
-       /**
-        * Sets the namespace
-        * 
-        * @param namespace The namespace
-        */
-       public void setNamespace(String namespace) {
-               this.namespace = namespace;
-       }
+    /**
+     * Sets the namespace
+     *
+     * @param namespace The namespace
+     */
+    public void setNamespace(String namespace) {
+        this.namespace = namespace;
+    }
 
-       /**
-        * Sets the method
-        * 
-        * @param method The method
-        */
-       public void setMethod(String method) {
-               this.method = method;
-       }
+    /**
+     * Sets the method
+     *
+     * @param method The method
+     */
+    public void setMethod(String method) {
+        this.method = method;
+    }
 
-       /**
-        * Adds a request parameter to be added to the redirect url
-        * 
-        * @param key The parameter name
-        * @param value The parameter value
-        *
-        * @return the portlet action redirect result
-        */
-       public PortletActionRedirectResult addParameter(String key, Object 
value) {
-               requestParameters.put(key, String.valueOf(value));
-               return this;
-       }
+    /**
+     * Adds a request parameter to be added to the redirect url
+     *
+     * @param key   The parameter name
+     * @param value The parameter value
+     * @return the portlet action redirect result
+     */
+    public PortletActionRedirectResult addParameter(String key, Object value) {
+        requestParameters.put(key, String.valueOf(value));
+        return this;
+    }
 
 }

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