This is an automated email from the ASF dual-hosted git repository.
markt pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/tomcat.git
The following commit(s) were added to refs/heads/master by this push:
new 03e7bc8 Fix JSP compilation showing old content reported on users@
list
03e7bc8 is described below
commit 03e7bc8487cb706adf1f56586948a7762dd42d14
Author: Mark Thomas <ma...@apache.org>
AuthorDate: Thu Nov 7 11:37:18 2019 +0000
Fix JSP compilation showing old content reported on users@ list
---
.../catalina/webresources/CachedResource.java | 126 ++++++++++++++++++++-
.../catalina/webresources/LocalStrings.properties | 2 +
webapps/docs/changelog.xml | 7 ++
3 files changed, 134 insertions(+), 1 deletion(-)
diff --git a/java/org/apache/catalina/webresources/CachedResource.java
b/java/org/apache/catalina/webresources/CachedResource.java
index 88d2453..72dba84 100644
--- a/java/org/apache/catalina/webresources/CachedResource.java
+++ b/java/org/apache/catalina/webresources/CachedResource.java
@@ -17,13 +17,21 @@
package org.apache.catalina.webresources;
import java.io.ByteArrayInputStream;
+import java.io.IOException;
import java.io.InputStream;
+import java.net.MalformedURLException;
import java.net.URL;
+import java.net.URLConnection;
+import java.net.URLStreamHandler;
+import java.security.Permission;
import java.security.cert.Certificate;
import java.util.jar.Manifest;
import org.apache.catalina.WebResource;
import org.apache.catalina.WebResourceRoot;
+import org.apache.juli.logging.Log;
+import org.apache.juli.logging.LogFactory;
+import org.apache.tomcat.util.res.StringManager;
/**
* This class is designed to wrap a 'raw' WebResource and providing caching for
@@ -32,6 +40,9 @@ import org.apache.catalina.WebResourceRoot;
*/
public class CachedResource implements WebResource {
+ private static final Log log = LogFactory.getLog(CachedResource.class);
+ private static final StringManager sm =
StringManager.getManager(CachedResource.class);
+
// Estimate (on high side to be safe) of average size excluding content
// based on profiler data.
private static final long CACHE_ENTRY_SIZE = 500;
@@ -314,7 +325,45 @@ public class CachedResource implements WebResource {
@Override
public URL getURL() {
- return webResource.getURL();
+ /*
+ * We don't want applications using this URL to access the resource
+ * directly as that could lead to inconsistent results when the
resource
+ * is updated on the file system but the cache entry has not yet
+ * expired. We saw this, for example, in JSP compilation.
+ * - last modified time was obtained via
+ *
ServletContext.getResource("path").openConnection().getLastModified()
+ * - JSP content was obtained via
+ * ServletContext.getResourceAsStream("path")
+ * The result was that the JSP modification was detected but the JSP
+ * content was read from the cache so the non-updated JSP page was
+ * used to generate the .java and .class file
+ *
+ * One option to resolve this issue is to use a custom URL scheme for
+ * resource URLs. This would allow us, via registration of a
+ * URLStreamHandlerFactory, to control how the resources are accessed
+ * and ensure that all access go via the cache We took this approach
for
+ * war: URLs so we can use jar:war:file: URLs to reference resources in
+ * unpacked WAR files. However, because
URL.setURLStreamHandlerFactory()
+ * may only be caused once, this can cause problems when using other
+ * libraries that also want to use a custom URL scheme.
+ *
+ * The approach below allows us to insert a custom URLStreamHandler
+ * without registering a custom protocol. The only limitation (compared
+ * to registering a custom protocol) is that if the application
+ * constructs the same URL from a String, they will access the resource
+ * directly and not via the cache.
+ */
+ URL resourceURL = webResource.getURL();
+ if (resourceURL == null) {
+ return null;
+ }
+ try {
+ return new URL(null, resourceURL.toExternalForm(),
+ new CachedResourceURLStreamHandler(resourceURL, root,
webAppPath, usesClassLoaderResources));
+ } catch (MalformedURLException e) {
+ log.error(sm.getString("cachedResource.invalidURL",
resourceURL.toExternalForm()), e);
+ return null;
+ }
}
@Override
@@ -355,4 +404,79 @@ public class CachedResource implements WebResource {
}
return result;
}
+
+
+ private static class CachedResourceURLStreamHandler extends
URLStreamHandler {
+
+ private final URL resourceURL;
+ private final StandardRoot root;
+ private final String webAppPath;
+ private final boolean usesClassLoaderResources;
+
+ public CachedResourceURLStreamHandler(URL resourceURL, StandardRoot
root, String webAppPath,
+ boolean usesClassLoaderResources) {
+ this.resourceURL = resourceURL;
+ this.root = root;
+ this.webAppPath = webAppPath;
+ this.usesClassLoaderResources = usesClassLoaderResources;
+ }
+
+ @Override
+ protected URLConnection openConnection(URL u) throws IOException {
+ return new CachedResourceURLConnection(resourceURL, root,
webAppPath, usesClassLoaderResources);
+ }
+ }
+
+
+ private static class CachedResourceURLConnection extends URLConnection {
+
+ private final StandardRoot root;
+ private final String webAppPath;
+ private final boolean usesClassLoaderResources;
+ private final URLConnection resourceURLConnection;
+ private boolean connected;
+
+ protected CachedResourceURLConnection(URL resourceURL, StandardRoot
root, String webAppPath,
+ boolean usesClassLoaderResources) throws IOException {
+ super(resourceURL);
+ this.root = root;
+ this.webAppPath = webAppPath;
+ this.usesClassLoaderResources = usesClassLoaderResources;
+ this.resourceURLConnection = url.openConnection();
+ }
+
+ @Override
+ public void connect() throws IOException {
+ if (!connected) {
+ resourceURLConnection.connect();
+ connected = true;
+ }
+ }
+
+ @Override
+ public InputStream getInputStream() throws IOException {
+ connect();
+ InputStream is = getResource().getInputStream();
+ return is;
+ }
+
+ @Override
+ public Permission getPermission() throws IOException {
+ return resourceURLConnection.getPermission();
+ }
+
+ @Override
+ public long getLastModified() {
+ return getResource().getLastModified();
+ }
+
+ @Override
+ public long getContentLengthLong() {
+ return getResource().getContentLength();
+ }
+
+ private WebResource getResource() {
+ return root.getResourceInternal(webAppPath,
usesClassLoaderResources);
+ }
+ }
}
diff --git a/java/org/apache/catalina/webresources/LocalStrings.properties
b/java/org/apache/catalina/webresources/LocalStrings.properties
index a69c178..fb9badc 100644
--- a/java/org/apache/catalina/webresources/LocalStrings.properties
+++ b/java/org/apache/catalina/webresources/LocalStrings.properties
@@ -25,6 +25,8 @@ cache.backgroundEvictFail=The background cache eviction
process was unable to fr
cache.objectMaxSizeTooBig=The value of [{0}]kB for objectMaxSize is larger
than the limit of maxSize/20 so has been reduced to [{1}]kB
cache.objectMaxSizeTooBigBytes=The value specified for the maximum object size
to cache [{0}]kB is greater than Integer.MAX_VALUE bytes which is the maximum
size that can be cached. The limit will be set to Integer.MAX_VALUE bytes.
+cachedResource.invalidURL=Unable to create an instance of
CachedResourceURLStreamHandler because the URL [{0}] is malformed
+
classpathUrlStreamHandler.notFound=Unable to load the resource [{0}] using the
thread context class loader or the current class''s class loader
dirResourceSet.manifestFail=Failed to read manifest from [{0}]
diff --git a/webapps/docs/changelog.xml b/webapps/docs/changelog.xml
index 926f6ce..fcc8dd5 100644
--- a/webapps/docs/changelog.xml
+++ b/webapps/docs/changelog.xml
@@ -63,6 +63,13 @@
<bug>63836</bug> Ensure that references to the Host object are cleared
once the Host instance is destroyed. (markt)
</fix>
+ <fix>
+ Ensure that, when static resource caching is enabled for a web
+ application, all access to static files (including JSP files) goes via
+ the cache so that a consistent view of the static files is seen. Prior
+ to this change it was possible to see an updated last modified time but
+ the content would be that prior to the modification. (markt)
+ </fix>
</changelog>
</subsection>
<subsection name="Coyote">
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