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From ma...@apache.org
Subject svn commit: r1066487 - in /tomcat/tc6.0.x/trunk: ./ java/org/apache/catalina/core/ java/org/apache/catalina/loader/ webapps/docs/ webapps/docs/config/
Date Wed, 02 Feb 2011 14:48:39 GMT
Author: markt
Date: Wed Feb  2 14:48:39 2011
New Revision: 1066487

URL: http://svn.apache.org/viewvc?rev=1066487&view=rev
Log:
Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=50642
Better memory leak protection for HttpClient keep-alive thread

Modified:
    tomcat/tc6.0.x/trunk/   (props changed)
    tomcat/tc6.0.x/trunk/STATUS.txt
    tomcat/tc6.0.x/trunk/java/org/apache/catalina/core/JreMemoryLeakPreventionListener.java
    tomcat/tc6.0.x/trunk/java/org/apache/catalina/core/StandardContext.java
    tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/LocalStrings.properties
    tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/WebappClassLoader.java
    tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/WebappLoader.java
    tomcat/tc6.0.x/trunk/webapps/docs/changelog.xml
    tomcat/tc6.0.x/trunk/webapps/docs/config/context.xml
    tomcat/tc6.0.x/trunk/webapps/docs/config/listeners.xml

Propchange: tomcat/tc6.0.x/trunk/
------------------------------------------------------------------------------
--- svn:mergeinfo (original)
+++ svn:mergeinfo Wed Feb  2 14:48:39 2011
@@ -1 +1 @@
-/tomcat/trunk:601180,606992,612607,630314,640888,652744,653247,666232,673796,673820,677910,683969,683982,684001,684081,684234,684269-684270,685177,687503,687645,689402,690781,691392,691805,692748,693378,694992,695053,695311,696780,696782,698012,698227,698236,698613,699427,699634,701355,709294,709811,709816,710063,710066,710125,710205,711126,711600,712461,712467,713953,714002,718360,719119,719124,719602,719626,719628,720046,720069,721040,721286,721708,721886,723404,723738,726052,727303,728032,728768,728947,729057,729567,729569,729571,729681,729809,729815,729934,730250,730590,731651,732859,732863,734734,740675,740684,742677,742697,742714,744160,744238,746321,746384,746425,747834,747863,748344,750258,750291,750921,751286-751287,751289,751295,752323,753039,757335,757774,758249,758365,758596,758616,758664,759074,761601,762868,762929,762936-762937,763166,763183,763193,763228,763262,763298,763302,763325,763599,763611,763654,763681,763706,764985,764997,765662,768335,769979,770716,77
 0809,770876,772872,776921,776924,776935,776945,777464,777466,777576,777625,778379,778523-778524,781528,781779,782145,782791,783316,783696,783724,783756,783762,783766,783863,783934,784453,784602,784614,785381,785688,785768,785859,786468,786487,786490,786496,786667,787627,787770,787985,789389,790405,791041,791184,791194,791224,791243,791326,791328,791789,792740,793372,793757,793882,793981,794082,794673,794822,795043,795152,795210,795457,795466,797168,797425,797596,797607,802727,802940,804462,804544,804734,805153,809131,809603,810916,810977,812125,812137,812432,813001,813013,813866,814180,814708,814876,815972,816252,817442,817822,819339,819361,820110,820132,820874,820954,821397,828196,828201,828210,828225,828759,830378-830379,830999,831106,831774,831785,831828,831850,831860,832214,832218,833121,833545,834047,835036,835336,836405,881396,881412,883130,883134,883146,883165,883177,883362,883565,884341,885038,885231,885241,885260,885901,885991,886019,888072,889363,889606,889716,8901
 39,890265,890349-890350,890417,891185-891187,891583,892198,892341,892415,892464,892555,892812,892814,892817,892843,892887,893321,893493,894580,894586,894805,894831,895013,895045,895057,895191,895392,895703,896370,896384,897380-897381,897776,898126,898256,898468,898527,898555,898558,898718,898836,898906,899284,899348,899420,899653,899769-899770,899783,899788,899792,899916,899918-899919,899935,899949,903916,905020,905151,905722,905728,905735,907311,907513,907538,907652,907819,907825,907864,908002,908721,908754,908759,909097,909206,909212,909525,909636,909869,909875,909887,910266,910370,910442,910471,910485,910974,915226,915737,915861,916097,916141,916157,916170,917598,917633,918093,918489,918594,918684,918787,918792,918799,918803,918885,919851,919914,920025,920055,920298,920449,920596,920824,920840,921444,922010,926716,927062,927621,928482,928695,928732,928798,931709,932357,932967,935105,935983,939491,939551,940064,941356,941463,944409,944416,945231,945808,945835,945841,946686
 ,948057,950164,950596,950614,950851,950905,951615,953434,954435,955648,955655,956832,957130,957830,958192,960701,961948,962865,962872,962881,962900,963106,963865,963868,964614,966177-966178,966292,966692,966863,981815,988448,991837,993042,1001955,1002185,1002263,1002274,1002349,1002359,1002362,1002481,1002514,1003461,1003481,1003488,1003556,1003572,1003581,1003861,1004393,1004409,1004415,1004868-1004869,1004912,1005452,1005467,1005647,1005802,1022120,1022134,1022323,1022415,1022606,1022623,1024224,1024251,1026042,1026784,1026912,1026920,1029767,1033415,1033448,1033842,1033897,1037715,1037794,1037887,1037924,1038041,1042022,1042029,1042447,1042452,1042494,1044944,1044987,1050249,1055055,1055236,1055458,1055975,1056264,1056828,1056889,1059881,1061412,1061442,1061446,1062398,1066244
+/tomcat/trunk:601180,606992,612607,630314,640888,652744,653247,666232,673796,673820,677910,683969,683982,684001,684081,684234,684269-684270,685177,687503,687645,689402,690781,691392,691805,692748,693378,694992,695053,695311,696780,696782,698012,698227,698236,698613,699427,699634,701355,709294,709811,709816,710063,710066,710125,710205,711126,711600,712461,712467,713953,714002,718360,719119,719124,719602,719626,719628,720046,720069,721040,721286,721708,721886,723404,723738,726052,727303,728032,728768,728947,729057,729567,729569,729571,729681,729809,729815,729934,730250,730590,731651,732859,732863,734734,740675,740684,742677,742697,742714,744160,744238,746321,746384,746425,747834,747863,748344,750258,750291,750921,751286-751287,751289,751295,752323,753039,757335,757774,758249,758365,758596,758616,758664,759074,761601,762868,762929,762936-762937,763166,763183,763193,763228,763262,763298,763302,763325,763599,763611,763654,763681,763706,764985,764997,765662,768335,769979,770716,77
 0809,770876,772872,776921,776924,776935,776945,777464,777466,777576,777625,778379,778523-778524,781528,781779,782145,782791,783316,783696,783724,783756,783762,783766,783863,783934,784453,784602,784614,785381,785688,785768,785859,786468,786487,786490,786496,786667,787627,787770,787985,789389,790405,791041,791184,791194,791224,791243,791326,791328,791789,792740,793372,793757,793882,793981,794082,794673,794822,795043,795152,795210,795457,795466,797168,797425,797596,797607,802727,802940,804462,804544,804734,805153,809131,809603,810916,810977,812125,812137,812432,813001,813013,813866,814180,814708,814876,815972,816252,817442,817822,819339,819361,820110,820132,820874,820954,821397,828196,828201,828210,828225,828759,830378-830379,830999,831106,831774,831785,831828,831850,831860,832214,832218,833121,833545,834047,835036,835336,836405,881396,881412,883130,883134,883146,883165,883177,883362,883565,884341,885038,885231,885241,885260,885901,885991,886019,888072,889363,889606,889716,8901
 39,890265,890349-890350,890417,891185-891187,891583,892198,892341,892415,892464,892555,892812,892814,892817,892843,892887,893321,893493,894580,894586,894805,894831,895013,895045,895057,895191,895392,895703,896370,896384,897380-897381,897776,898126,898256,898468,898527,898555,898558,898718,898836,898906,899284,899348,899420,899653,899769-899770,899783,899788,899792,899916,899918-899919,899935,899949,903916,905020,905151,905722,905728,905735,907311,907513,907538,907652,907819,907825,907864,908002,908721,908754,908759,909097,909206,909212,909525,909636,909869,909875,909887,910266,910370,910442,910471,910485,910974,915226,915737,915861,916097,916141,916157,916170,917598,917633,918093,918489,918594,918684,918787,918792,918799,918803,918885,919851,919914,920025,920055,920298,920449,920596,920824,920840,921444,922010,926716,927062,927621,928482,928695,928732,928798,931709,932357,932967,935105,935983,939491,939551,940064,941356,941463,944409,944416,945231,945808,945835,945841,946686
 ,948057,950164,950596,950614,950851,950905,951615,953434,954435,955648,955655,956832,957130,957830,958192,960701,961948,962865,962872,962881,962900,963106,963865,963868,964614,966177-966178,966292,966692,966863,981815,988448,991837,993042,1001955,1002185,1002263,1002274,1002349,1002359,1002362,1002481,1002514,1003461,1003481,1003488,1003556,1003572,1003581,1003861,1004393,1004409,1004415,1004868-1004869,1004912,1005452,1005467,1005647,1005802,1022120,1022134,1022323,1022415,1022606,1022623,1024224,1024251,1026042,1026784,1026912,1026920,1029767,1033415,1033448,1033842,1033897,1037715,1037794,1037887,1037924,1038041,1042022,1042029,1042447,1042452,1042494,1044944,1044987,1050249,1055055,1055236,1055458,1055975,1056264,1056828,1056889,1059881,1061412,1061442,1061446,1062398,1064652,1066244

Modified: tomcat/tc6.0.x/trunk/STATUS.txt
URL: http://svn.apache.org/viewvc/tomcat/tc6.0.x/trunk/STATUS.txt?rev=1066487&r1=1066486&r2=1066487&view=diff
==============================================================================
--- tomcat/tc6.0.x/trunk/STATUS.txt (original)
+++ tomcat/tc6.0.x/trunk/STATUS.txt Wed Feb  2 14:48:39 2011
@@ -89,16 +89,6 @@ PATCHES PROPOSED TO BACKPORT:
               We can stall this item until we get some feedback about 7.0.5.
   -1:
 
-* Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=50642
-  Better memory leak protection for HttpClient keep-alive thread
-  http://svn.apache.org/viewvc?rev=1064652&view=rev
-  +1: markt, kkolinko,funkman
-  -1:
-
-  kkolinko: About the docs: it might be better to be explicit:
-  s/HttpClient/sun.net.www.http.HttpClient/, to avoid confusion with Apache
-  component with the same name, http://hc.apache.org/httpcomponents-client-ga/
-
 * Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=50325
   Use JVM provided solutions to CVE-2009-3555 if available (i.e. RFC 5746
   support)

Modified: tomcat/tc6.0.x/trunk/java/org/apache/catalina/core/JreMemoryLeakPreventionListener.java
URL: http://svn.apache.org/viewvc/tomcat/tc6.0.x/trunk/java/org/apache/catalina/core/JreMemoryLeakPreventionListener.java?rev=1066487&r1=1066486&r2=1066487&view=diff
==============================================================================
--- tomcat/tc6.0.x/trunk/java/org/apache/catalina/core/JreMemoryLeakPreventionListener.java
(original)
+++ tomcat/tc6.0.x/trunk/java/org/apache/catalina/core/JreMemoryLeakPreventionListener.java
Wed Feb  2 14:48:39 2011
@@ -82,19 +82,6 @@ public class JreMemoryLeakPreventionList
 
      /**
       * Protect against the memory leak caused when the first call to
-      * <code>sun.net.www.http.HttpClient</code> is triggered by a web
-      * application. This first call will start a KeepAlive thread with the
-      * thread's context class loader configured to be the web application class
-      * loader. Defaults to <code>true</code>.
-      */
-     private boolean keepAliveProtection = true;
-     public boolean isKeepAliveProtection() { return keepAliveProtection; }
-     public void setKeepAliveProtection(boolean keepAliveProtection) {
-         this.keepAliveProtection = keepAliveProtection;
-     }
-    
-     /**
-      * Protect against the memory leak caused when the first call to
       * <code>javax.security.auth.Policy</code> is triggered by a web
       * application. This first call populate a static variable with a reference
       * to the context class loader. Defaults to <code>true</code>.
@@ -251,27 +238,6 @@ public class JreMemoryLeakPreventionList
                 }
     
                 /*
-                 * When a servlet opens a connection using a URL it will use
-                 * sun.net.www.http.HttpClient which keeps a static reference to
-                 * a keep-alive cache which is loaded using the web application
-                 * class loader.
-                 */
-                if (keepAliveProtection) {
-                    try {
-                        Class.forName("sun.net.www.http.HttpClient");
-                    } catch (ClassNotFoundException e) {
-                        if (System.getProperty("java.vendor").startsWith(
-                                "Sun")) {
-                            log.error(sm.getString(
-                                    "jreLeakListener.keepAliveFail"), e);
-                        } else {
-                            log.debug(sm.getString(
-                                    "jreLeakListener.keepAliveFail"), e);
-                        }
-                    }
-                }
-                
-                /*
                  * Calling getPolicy retains a static reference to the context 
                  * class loader.
                  */

Modified: tomcat/tc6.0.x/trunk/java/org/apache/catalina/core/StandardContext.java
URL: http://svn.apache.org/viewvc/tomcat/tc6.0.x/trunk/java/org/apache/catalina/core/StandardContext.java?rev=1066487&r1=1066486&r2=1066487&view=diff
==============================================================================
--- tomcat/tc6.0.x/trunk/java/org/apache/catalina/core/StandardContext.java (original)
+++ tomcat/tc6.0.x/trunk/java/org/apache/catalina/core/StandardContext.java Wed Feb  2 14:48:39
2011
@@ -754,6 +754,16 @@ public class StandardContext
      * default value of <code>false</code> will be used.
      */
     private boolean clearReferencesStopTimerThreads = false;
+
+    /**
+     * If an HttpClient keep-alive timer thread has been started by this web
+     * application and is still running, should Tomcat change the context class
+     * loader from the current {@link WebappClassLoader} to
+     * {@link WebappClassLoader#parent} to prevent a memory leak? Note that the
+     * keep-alive timer thread will stop on its own once the keep-alives all
+     * expire however, on a busy system that might not happen for some time.
+     */
+    private boolean clearReferencesHttpClientKeepAliveThread = true;
     
     /**
      * Should Tomcat attempt to clear any ThreadLocal objects that are instances
@@ -2227,7 +2237,27 @@ public class StandardContext
     public boolean getClearReferencesThreadLocals() {
 
         return (this.clearReferencesThreadLocals);
+    }
+
+    /**
+     * Return the clearReferencesHttpClientKeepAliveThread flag for this
+     * Context.
+     */
+    public boolean getClearReferencesHttpClientKeepAliveThread() {
+        return (this.clearReferencesHttpClientKeepAliveThread);
+    }
+
 
+    /**
+     * Set the clearReferencesHttpClientKeepAliveThread feature for this
+     * Context.
+     *
+     * @param clearReferencesHttpClientKeepAliveThread The new flag value
+     */
+    public void setClearReferencesHttpClientKeepAliveThread(
+            boolean clearReferencesHttpClientKeepAliveThread) {
+        this.clearReferencesHttpClientKeepAliveThread =
+            clearReferencesHttpClientKeepAliveThread;
     }
 
 

Modified: tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/LocalStrings.properties
URL: http://svn.apache.org/viewvc/tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/LocalStrings.properties?rev=1066487&r1=1066486&r2=1066487&view=diff
==============================================================================
--- tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/LocalStrings.properties (original)
+++ tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/LocalStrings.properties Wed Feb 
2 14:48:39 2011
@@ -52,6 +52,7 @@ webappClassLoader.clearThreadLocalFail=F
 webappClassLoader.clearThreadLocal.badKey=Unable to determine string representation of key
of type [{0}]
 webappClassLoader.clearThreadLocal.badValue=Unable to determine string representation of
value of type [{0}]
 webappClassLoader.clearThreadLocal.unknown=Unknown
+webappClassLoader.checkThreadsHttpClient=Found HttpClient keep-alive thread using web application
class loader. Fixed by switching thread to the parent class loader.
 webappClassLoader.stopThreadFail=Failed to terminate thread named [{0}] for web application
[{1}]
 webappClassLoader.stopTimerThreadFail=Failed to terminate TimerThread named [{0}] for web
application [{1}]
 webappClassLoader.validationErrorJarPath=Unable to validate JAR entry with name {0}

Modified: tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/WebappClassLoader.java
URL: http://svn.apache.org/viewvc/tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/WebappClassLoader.java?rev=1066487&r1=1066486&r2=1066487&view=diff
==============================================================================
--- tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/WebappClassLoader.java (original)
+++ tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/WebappClassLoader.java Wed Feb  2
14:48:39 2011
@@ -150,8 +150,10 @@ public class WebappClassLoader
 
     }
 
+    private static final String JVN_THREAD_GROUP_SYSTEM = "system";
+    
     static {
-        JVM_THREAD_GROUP_NAMES.add("system");
+        JVM_THREAD_GROUP_NAMES.add(JVN_THREAD_GROUP_SYSTEM);
         JVM_THREAD_GROUP_NAMES.add("RMI Runtime");
     }
 
@@ -480,6 +482,15 @@ public class WebappClassLoader
      */
     private boolean clearReferencesLogFactoryRelease = true;
 
+    /**
+     * If an HttpClient keep-alive timer thread has been started by this web
+     * application and is still running, should Tomcat change the context class
+     * loader from the current {@link WebappClassLoader} to
+     * {@link WebappClassLoader#parent} to prevent a memory leak? Note that the
+     * keep-alive timer thread will stop on its own once the keep-alives all
+     * expire however, on a busy system that might not happen for some time.
+     */
+    private boolean clearReferencesHttpClientKeepAliveThread = true;
     
     /**
      * Name of associated context used with logging and JMX to associate with
@@ -759,6 +770,28 @@ public class WebappClassLoader
      }
 
 
+     /**
+      * Return the clearReferencesHttpClientKeepAliveThread flag for this
+      * Context.
+      */
+     public boolean getClearReferencesHttpClientKeepAliveThread() {
+         return (this.clearReferencesHttpClientKeepAliveThread);
+     }
+
+
+     /**
+      * Set the clearReferencesHttpClientKeepAliveThread feature for this
+      * Context.
+      *
+      * @param clearReferencesHttpClientKeepAliveThread The new flag value
+      */
+     public void setClearReferencesHttpClientKeepAliveThread(
+             boolean clearReferencesHttpClientKeepAliveThread) {
+         this.clearReferencesHttpClientKeepAliveThread =
+             clearReferencesHttpClientKeepAliveThread;
+     }
+
+     
     // ------------------------------------------------------- Reloader Methods
 
 
@@ -2126,10 +2159,20 @@ public class WebappClassLoader
                         continue;
                     }
 
-                    // Don't warn about JVM controlled threads
+                    // JVM controlled threads
                     ThreadGroup tg = thread.getThreadGroup();
                     if (tg != null &&
                             JVM_THREAD_GROUP_NAMES.contains(tg.getName())) {
+
+                        // HttpClient keep-alive threads
+                        if (clearReferencesHttpClientKeepAliveThread &&
+                                thread.getName().equals("Keep-Alive-Timer")) {
+                            thread.setContextClassLoader(parent);
+                            log.debug(sm.getString(
+                                    "webappClassLoader.checkThreadsHttpClient"));
+                        }
+                    
+                        // Don't warn about remaining JVM controlled threads
                         continue;
                     }
                    

Modified: tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/WebappLoader.java
URL: http://svn.apache.org/viewvc/tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/WebappLoader.java?rev=1066487&r1=1066486&r2=1066487&view=diff
==============================================================================
--- tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/WebappLoader.java (original)
+++ tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/WebappLoader.java Wed Feb  2 14:48:39
2011
@@ -671,6 +671,8 @@ public class WebappLoader
                         ((StandardContext) container).getClearReferencesStopTimerThreads());
                 classLoader.setClearReferencesThreadLocals(
                         ((StandardContext) container).getClearReferencesThreadLocals());
+                classLoader.setClearReferencesHttpClientKeepAliveThread(
+                        ((StandardContext) container).getClearReferencesHttpClientKeepAliveThread());
             }
 
             for (int i = 0; i < repositories.length; i++) {

Modified: tomcat/tc6.0.x/trunk/webapps/docs/changelog.xml
URL: http://svn.apache.org/viewvc/tomcat/tc6.0.x/trunk/webapps/docs/changelog.xml?rev=1066487&r1=1066486&r2=1066487&view=diff
==============================================================================
--- tomcat/tc6.0.x/trunk/webapps/docs/changelog.xml (original)
+++ tomcat/tc6.0.x/trunk/webapps/docs/changelog.xml Wed Feb  2 14:48:39 2011
@@ -323,6 +323,12 @@
         system property <code>com.sun.jndi.ldap.connect.pool.timeout</code> is

         set to a value greater than 0. (slaurent)
       </add>
+      <fix>
+        <bug>50642</bug>: Move the <code>sun.net.www.http.HttpClient</code>
+        keep-alive thread memory leak protection from the 
+        JreMemoryLeakPreventionListener to the WebappClassLoader since the
+        thread that triggers the memory leak is created on demand. (markt)
+      </fix>
     </changelog>
   </subsection>
   <subsection name="Coyote">

Modified: tomcat/tc6.0.x/trunk/webapps/docs/config/context.xml
URL: http://svn.apache.org/viewvc/tomcat/tc6.0.x/trunk/webapps/docs/config/context.xml?rev=1066487&r1=1066486&r2=1066487&view=diff
==============================================================================
--- tomcat/tc6.0.x/trunk/webapps/docs/config/context.xml (original)
+++ tomcat/tc6.0.x/trunk/webapps/docs/config/context.xml Wed Feb  2 14:48:39 2011
@@ -365,6 +365,18 @@
         disclosure, among other security problems.</b></p>
       </attribute>
 
+      <attribute name="clearReferencesHttpClientKeepAliveThread" required = "false">
+        <p>If <code>true</code> and an <code>sun.net.www.http.HttpClient</code>
+        keep-alive timer thread has been started by this web application and is
+        still running, Tomcat will change the context class loader for that
+        thread from the current <code>WebappClassLoader</code> to
+        <code>WebappClassLoader#parent</code> to prevent a memory leak. Note
+        that the keep-alive timer thread will stop on its own once the
+        keep-alives all expire however, on a busy system that might not happen
+        for some time. If not specified, the default value of
+        <code>true</code> will be used.</p>
+      </attribute>
+
       <attribute name="clearReferencesStopThreads" required = "false">
         <p>If <code>true</code>, Tomcat attempts to terminate threads that
have
         been started by the web application. Stopping threads is performed via

Modified: tomcat/tc6.0.x/trunk/webapps/docs/config/listeners.xml
URL: http://svn.apache.org/viewvc/tomcat/tc6.0.x/trunk/webapps/docs/config/listeners.xml?rev=1066487&r1=1066486&r2=1066487&view=diff
==============================================================================
--- tomcat/tc6.0.x/trunk/webapps/docs/config/listeners.xml (original)
+++ tomcat/tc6.0.x/trunk/webapps/docs/config/listeners.xml Wed Feb  2 14:48:39 2011
@@ -260,16 +260,6 @@ service:jmx:rmi://&lt;hostname&gt;:10002
         startup on non-Sun JVMs. The default is <code>true</code>.</p>
       </attribute>
 
-      <attribute name="keepAliveProtection" required="false">
-        <p>Enables protection so that the KeepAlive thread started by
-        <code>sun.net.www.http.HttpClient</code> does not result in a memory
-        leak. The thread is started the first time the <code>HttpClient</code>
-        class is used. Without this protection, if a web application uses this
-        class the KeepAlive thread will be configured with the thread's context
-        class loader set to the web application class loader which in turn will
-        trigger a memory leak on reload. Defaults to <code>true</code>.</p>
-      </attribute>
-
       <attribute name="ldapPoolProtection" required="false">
         <p>Enables protection so that the PoolCleaner thread started by
         <code>com.sun.jndi.ldap.LdapPoolManager</code> does not result in a 



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