Stop applying the Times in TOMCAT7 error: created a ThreadLocal with key of type

stop applying the Times error under TOMCAT7: Created a ThreadLocal with key of type [com.opensymphony.xwork2.inject.containerimpl$10]

Info:a valid Shutdown command was received via the shutdown port. Stopping the Server instance. APR 10:36:52 AM org.apache.coyote.AbstractProtocol pauseinfo:pausing protocolhandler ["http-bio-8080"]apr 02, 2 015 10:36:52 AM org.apache.coyote.AbstractProtocol pauseinfo:pausing protocolhandler ["ajp-bio-8009"]apr 02, 2015 10:36 : Org.apache.catalina.core.StandardService stopinternalinfo:stopping Service CATALINAAPR, 10:36:52 am ORG.A Pache.catalina.core.ApplicationContext loginfo:closing Spring Root webapplicationcontextapr, 10:36:52 AM Org.apache.catalina.loader.WebappClassLoader checkthreadlocalmapforleaks<span style= "color: #ff0000;" >severe:the Web application [/TECHREVMANAGER5] created a ThreadLocal with key of type [Com.opensymphony.xwork2.inject. CONTAINERIMPL$3] (value [[email protected]]) and a value of type [java.lang.object[]] (value [[ljava.lang.object;@ 7F5846D0] Failed to remove it when the Web application is stopped. Threads is Going to is renewed over time to try and avoid a probable memory leak.</span>apr, 10:36:52 AM org.apache.co Yote. Abstractprotocol stopinfo:stopping Protocolhandler ["http-bio-8080"]APR, 10:36:52 AM Org.apache.coyote.AbstractProtocol stopinfo:stopping Protocolhandler ["ajp-bio-8009"]APR, 10:36:52 AM Org.apache.coyote.AbstractProtocol destroyinfo:destroying Protocolhandler ["http-bio-8080"]APR, 10:36:52 AM Org.apache.coyote.AbstractProtocol destroyinfo:destroying Protocolhandler ["ajp-bio-8009"]

let's start with the development environment checklist.：
Tomcat-7.0.59
xwork-core-2.2.1
struts2-core-2.2.1


Analysis Process：
From the error situation, there is a problem with the class Com.opensymphony.xwork2.inject.ContainerImpl in Xwork.
Download xwork-core-2.2.1 source, open the Containerimpl file, see the code in line 557-583, there is a problem with memory not released:

Here, a one-dimensional array is initialized in the thread variable threadlocal<object[]> localcontext =  new threadlocal<object[]> () {@ overrideprotected object[] InitialValue () {  return new object[1];}  };/ Looks up thread local context. Creates (and removes) a new context if* necessary.*/<t> T Callincontext (contextualcallable<t> callable) {Obje ct[] Reference = Localcontext.get (), if (reference[0] = = null) {  reference[0] = new Internalcontext (this);  try {return Callable.call ((Internalcontext) reference[0]);  } finally {//only remove the context if this call created I T.reference[0] = null;//Only the elements in the array are freed, and the array object of the thread variable is not freed  }} else {  //Someone else will clean up the this context.  Return Callable.call ((Internalcontext) reference[0]);}}

Workaround：
Problems and causes are found, then the solution is simple, there are two options to choose:

1. Upgrade the version of the jar file for xwork, according to my check, this problem does not exist from the xwork-core-2.3.3 and later versions. Accordingly, you may need to upgrade your struts2-core-2.3.3 above.
2. Modify the Com.opensymphony.xwork2.inject.ContainerImpl file in the xwork-core-2.2.1, and then put it in the Classpath path (to replace the class in the Jar file)

<T> T Callincontext (contextualcallable<t> callable) {object[] reference = Localcontext.get (); if (reference [0] = = null) {  reference[0] = new Internalcontext (this);  try {return Callable.call ((Internalcontext) reference[0]);  } finally {//only remove the context if this call created I T.reference[0] = null;//to release the array object of the thread variable This.localContext.remove ();}  } else {  //Someone else would clean up this context.  Return Callable.call ((Internalcontext) reference[0]);}}

Stop applying the Times in TOMCAT7 error: created a ThreadLocal with key of type