Author: markt
Date: Mon Mar 29 15:01:14 2010
New Revision: 928798
URL: http://svn.apache.org/viewvc?rev=928798&view=rev
Log:
Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=48895
Make clearing thread locals optional and disabled by default since it isn't
thread-safe
Modified:
tomcat/trunk/java/org/apache/catalina/core/StandardContext.java
tomcat/trunk/java/org/apache/catalina/loader/LocalStrings.properties
tomcat/trunk/java/org/apache/catalina/loader/WebappClassLoader.java
tomcat/trunk/java/org/apache/catalina/loader/WebappLoader.java
tomcat/trunk/webapps/docs/config/context.xml
Modified: tomcat/trunk/java/org/apache/catalina/core/StandardContext.java
URL:
http://svn.apache.org/viewvc/tomcat/trunk/java/org/apache/catalina/core/StandardContext.java?rev=928798&r1=928797&r2=928798&view=diff
==============================================================================
--- tomcat/trunk/java/org/apache/catalina/core/StandardContext.java (original)
+++ tomcat/trunk/java/org/apache/catalina/core/StandardContext.java Mon Mar 29
15:01:14 2010
@@ -772,7 +772,16 @@ public class StandardContext
* <code>false</code> will be used.
*/
private boolean clearReferencesStopThreads = false;
-
+
+ /**
+ * Should Tomcat attempt to clear any ThreadLocal objects that are
instances
+ * of classes loaded by this class loader. Failure to remove any such
+ * objects will result in a memory leak on web application stop, undeploy
or
+ * reload. It is disabled by default since the clearing of the ThreadLocal
+ * objects is not performed in a thread-safe manner.
+ */
+ private boolean clearReferencesThreadLocals = false;
+
/**
* Should the effective web.xml be logged when the context starts?
*/
@@ -2288,6 +2297,34 @@ public class StandardContext
/**
+ * Return the clearReferencesThreadLocals flag for this Context.
+ */
+ public boolean getClearReferencesThreadLocals() {
+
+ return (this.clearReferencesThreadLocals);
+
+ }
+
+
+ /**
+ * Set the clearReferencesStopThreads feature for this Context.
+ *
+ * @param clearReferencesStopThreads The new flag value
+ */
+ public void setClearReferencesThreadLocals(
+ boolean clearReferencesThreadLocals) {
+
+ boolean oldClearReferencesThreadLocals =
+ this.clearReferencesThreadLocals;
+ this.clearReferencesThreadLocals = clearReferencesThreadLocals;
+ support.firePropertyChange("clearReferencesStopThreads",
+ oldClearReferencesThreadLocals,
+ this.clearReferencesThreadLocals);
+
+ }
+
+
+ /**
* Has this context been initialized?
*/
public boolean isInitialized() {
Modified: tomcat/trunk/java/org/apache/catalina/loader/LocalStrings.properties
URL:
http://svn.apache.org/viewvc/tomcat/trunk/java/org/apache/catalina/loader/LocalStrings.properties?rev=928798&r1=928797&r2=928798&view=diff
==============================================================================
--- tomcat/trunk/java/org/apache/catalina/loader/LocalStrings.properties
(original)
+++ tomcat/trunk/java/org/apache/catalina/loader/LocalStrings.properties Mon
Mar 29 15:01:14 2010
@@ -38,8 +38,10 @@ webappClassLoader.clearReferencesResourc
webappClassLoader.clearReferencesResourceBundlesFail=Failed to clear
ResourceBundle references for web application [{0}]
webappClassLoader.clearRmiInfo=Failed to find class sun.rmi.transport.Target
to clear context class loader for web application [{0}]. This is expected on
non-Sun JVMs.
webappClassLoader.clearRmiFail=Failed to clear context class loader referenced
from sun.rmi.transport.Target for web application [{0}]
-webappClassLoader.clearThreadLocalDebug=The web application [{0}] created a
ThreadLocal with key of type [{1}] (value [{2}]). The ThreadLocal has been
correctly set to null and the key will be removed by GC. However, to simplify
the process of tracing memory leaks, the key has been forcibly removed.
-webappClassLoader.clearThreadLocal=The web application [{0}] created a
ThreadLocal with key of type [{1}] (value [{2}]) and a value of type [{3}]
(value [{4}]) but failed to remove it when the web application was stopped. To
prevent a memory leak, the ThreadLocal has been forcibly removed.
+webappClassLoader.clearThreadLocalDebug=The web application [{0}] created a
ThreadLocal with key of type [{1}] (value [{2}]). The ThreadLocal has been
correctly set to null and the key will be removed by GC.
+webappClassLoader.clearThreadLocal=The web application [{0}] created a
ThreadLocal with key of type [{1}] (value [{2}]) and a value of type [{3}]
(value [{4}]) but failed to remove it when the web application was stopped.
This is very likely to create a memory leak.
+webappClassLoader.clearThreadLocalDebugClear=To simplify the process of
tracing memory leaks, the key has been forcibly removed.
+webappClassLoader.clearThreadLocalClear=To prevent a memory leak, the
ThreadLocal has been forcibly removed.
webappClassLoader.clearThreadLocalFail=Failed to clear ThreadLocal references
for web application [{0}]
webappClassLoader.stopThreadFail=Failed to terminate thread named [{0}] for
web application [{1}]
webappClassLoader.stopTimerThreadFail=Failed to terminate TimerThread named
[{0}] for web application [{1}]
Modified: tomcat/trunk/java/org/apache/catalina/loader/WebappClassLoader.java
URL:
http://svn.apache.org/viewvc/tomcat/trunk/java/org/apache/catalina/loader/WebappClassLoader.java?rev=928798&r1=928797&r2=928798&view=diff
==============================================================================
--- tomcat/trunk/java/org/apache/catalina/loader/WebappClassLoader.java
(original)
+++ tomcat/trunk/java/org/apache/catalina/loader/WebappClassLoader.java Mon Mar
29 15:01:14 2010
@@ -446,6 +446,15 @@ public class WebappClassLoader
private boolean clearReferencesStopThreads = false;
/**
+ * Should Tomcat attempt to clear any ThreadLocal objects that are
instances
+ * of classes loaded by this class loader. Failure to remove any such
+ * objects will result in a memory leak on web application stop, undeploy
or
+ * reload. It is disabled by default since the clearing of the ThreadLocal
+ * objects is not performed in a thread-safe manner.
+ */
+ private boolean clearReferencesThreadLocals = false;
+
+ /**
* Should Tomcat call {...@link
org.apache.juli.logging.LogFactory#release()}
* when the class loader is stopped? If not specified, the default value
* of <code>true</code> is used. Changing the default setting is likely to
@@ -676,6 +685,27 @@ public class WebappClassLoader
}
+
+
+ /**
+ * Return the clearReferencesThreadLocals flag for this Context.
+ */
+ public boolean getClearReferencesThreadLocals() {
+ return (this.clearReferencesThreadLocals);
+ }
+
+
+ /**
+ * Set the clearReferencesThreadLocals feature for this Context.
+ *
+ * @param clearReferencesThreadLocals The new flag value
+ */
+ public void setClearReferencesThreadLocals(
+ boolean clearReferencesThreadLocals) {
+ this.clearReferencesThreadLocals = clearReferencesThreadLocals;
+ }
+
+
/**
* Set the clearReferencesLogFactoryRelease feature for this Context.
*
@@ -2254,16 +2284,26 @@ public class WebappClassLoader
log.debug(sm.getString(
"webappClassLoader.clearThreadLocalDebug",
args));
+ if (clearReferencesThreadLocals) {
+ log.debug(sm.getString(
+
"webappClassLoader.clearThreadLocalDebugClear"));
+ }
}
} else {
log.error(sm.getString(
"webappClassLoader.clearThreadLocal",
args));
+ if (clearReferencesThreadLocals) {
+ log.info(sm.getString(
+
"webappClassLoader.clearThreadLocalClear"));
+ }
}
- if (key == null) {
- staleEntriesCount++;
- } else {
- mapRemove.invoke(map, key);
+ if (clearReferencesThreadLocals) {
+ if (key == null) {
+ staleEntriesCount++;
+ } else {
+ mapRemove.invoke(map, key);
+ }
}
}
}
Modified: tomcat/trunk/java/org/apache/catalina/loader/WebappLoader.java
URL:
http://svn.apache.org/viewvc/tomcat/trunk/java/org/apache/catalina/loader/WebappLoader.java?rev=928798&r1=928797&r2=928798&view=diff
==============================================================================
--- tomcat/trunk/java/org/apache/catalina/loader/WebappLoader.java (original)
+++ tomcat/trunk/java/org/apache/catalina/loader/WebappLoader.java Mon Mar 29
15:01:14 2010
@@ -596,6 +596,8 @@ public class WebappLoader extends Lifecy
((StandardContext)
container).getClearReferencesStatic());
classLoader.setClearReferencesStopThreads(
((StandardContext)
container).getClearReferencesStopThreads());
+ classLoader.setClearReferencesThreadLocals(
+ ((StandardContext)
container).getClearReferencesThreadLocals());
}
for (int i = 0; i < repositories.length; i++) {
Modified: tomcat/trunk/webapps/docs/config/context.xml
URL:
http://svn.apache.org/viewvc/tomcat/trunk/webapps/docs/config/context.xml?rev=928798&r1=928797&r2=928798&view=diff
==============================================================================
--- tomcat/trunk/webapps/docs/config/context.xml (original)
+++ tomcat/trunk/webapps/docs/config/context.xml Mon Mar 29 15:01:14 2010
@@ -380,6 +380,15 @@
default value of <code>false</code> will be used.</p>
</attribute>
+ <attribute name="clearReferencesThreadLocals" required="false">
+ <p>If <code>true</code>, Tomcat attempts to clear any ThreadLocal
+ objects that are instances of classes loaded by this class loader.
+ Failure to remove any such objects will result in a memory leak on web
+ application stop, undeploy or reload. If not specified, the default
+ value of <code>false</code> will be used since the clearing of the
+ ThreadLocal objects is not performed in a thread-safe manner.</p>
+ </attribute>
+
<attribute name="processTlds" required="false">
<p>Whether the context should process TLDs on startup. The default
is true. The false setting is intended for special cases
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