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https://issues.apache.org/jira/browse/XALANJ-2533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12990563#comment-12990563
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Christophe DUVAL commented on XALANJ-2533:
------------------------------------------
Hi,
I am currently tuning a Java multithreated application which uses intensively
XALAN/Xpath. I have a performance issue. I analyzed many java core dump during
a test, and I saw a problem related to DTMManager.newInstance. All new thread
executing DTMManager.newInstance try to load again the associated class, and
causes many thread lock wait.
Class loader issue:
at java/lang/ClassLoader.loadClass(ClassLoader.java:573(Compiled Code))
at
org/apache/xml/dtm/ObjectFactory.findProviderClass(ObjectFactory.java:506(Compiled
Code))
at
org/apache/xml/dtm/ObjectFactory.lookUpFactoryClass(ObjectFactory.java:217(Compiled
Code))
at
org/apache/xml/dtm/ObjectFactory.createObject(ObjectFactory.java:131(Compiled
Code))
at
org/apache/xml/dtm/ObjectFactory.createObject(ObjectFactory.java:101(Compiled
Code))
at org/apache/xml/dtm/DTMManager.newInstance(DTMManager.java:135(Compiled Code))
at org/apache/xpath/XPathContext.(XPathContext.java:100(Compiled Code))
at com/aaa/bbb/util/xml/XMLUtil.getXObject(XMLUtil.java:1039(Compiled Code))
at com/aaa/bbb/xpathutil/XPathHelper.executeXPath(XPathHelper.java:454(Compiled
Code))
at com/aaa/bbb/xpathutil/XPathHelper.executeXPath(XPathHelper.java:150(Compiled
Code))
at
com/aaa/bbb/xpathutil/XPathHelper.getNodeListFromXPath(XPathHelper.java:889(Compiled
Code))
at
com/aaa/bbb/xpathutil/XPathHelper.getNodeListFromXPath(XPathHelper.java:883(Compiled
Code))
at com/aaa/bbb/workflow/WFCUtil.getDataFromTree(WFCUtil.java:1119(Compiled
Code))
at
com/aaa/bbb/workflow/WorkFlowContext.getDataFromTree(WorkFlowContext.java:2692(Compiled
Code))
at
com/aaa/bbb/workflow/WorkFlowContext.getWFContent(WorkFlowContext.java:2573(Compiled
Code))
at
com/aaa/bbb/workflow/WorkFlowContext.getWFContent(WorkFlowContext.java:2565(Compiled
Code))
at
com/aaa/bbb/workflow/WorkFlowContext.getWFContent(WorkFlowContext.java:2476(Compiled
Code))
at
com/swg/services/SWG_CREMSG_ServiceImpl.processData(SWG_CREMSG_ServiceImpl.java:348(Compiled
Code))
at
com/aaa/bbb/workflow/activity/engine/ActivityEngineHelper.invokeService(ActivityEngineHelper.java:1774(Compiled
Code))
at
com/aaa/bbb/workflow/activity/engine/ActivityEngineHelper.nextMainLogic(ActivityEngineHelper.java:644(Compiled
Code))
at
com/aaa/bbb/workflow/activity/engine/ActivityEngineHelper.next(ActivityEngineHelper.java:371(Compiled
Code))
at
com/aaa/bbb/workflow/queue/WorkFlowQueueListener.doWork(WorkFlowQueueListener.java:328(Compiled
Code))
at
com/aaa/bbb/workflow/queue/WorkFlowQueueListener.run(WorkFlowQueueListener.java:202(Compiled
Code))
at
com/aaa/bbb/workflow/queue/WorkFlowQueueListener.onMessage(WorkFlowQueueListener.java:163(Compiled
Code))
at
com/aaa/bbb/workflow/queue/WorkFlowQueueListener.onMessage(WorkFlowQueueListener.java:149(Compiled
Code))
at com/aaa/bbb/workflow/queue/wfTransporter.run(wfTransporter.java:354(Compiled
Code))
at
com/aaa/bbb/workflow/queue/BasicExecutor$Worker.run(BasicExecutor.java:517(Compiled
Code))
at java/lang/Thread.run(Thread.java:801(Compiled Code))
Waiting for Monitor Lock on
com/aaa/bbb/ldr/DynamicClassLoader@700F5470/700F547C issue (one example):
HAR.2035844.Thread (com/aaa/bbb/ldr/DynamicClassLoader@700F5470/700F547C)
HAR.2035834.Thread (com/aaa/bbb/ldr/DynamicClassLoader@700F5470/700F547C)
HAR.2036928.Thread (com/aaa/bbb/ldr/DynamicClassLoader@700F5470/700F547C)
WFE.2036925.Thread (com/aaa/bbb/ldr/DynamicClassLoader@700F5470/700F547C)
HAR.2036915.Thread (com/aaa/bbb/ldr/DynamicClassLoader@700F5470/700F547C)
WFE.2036475.Thread (com/aaa/bbb/ldr/DynamicClassLoader@700F5470/700F547C)
HAR.2036473.Thread (com/aaa/bbb/ldr/DynamicClassLoader@700F5470/700F547C)
WFE.2036466.Thread (com/aaa/bbb/ldr/DynamicClassLoader@700F5470/700F547C)
HAR.2035843.Thread (com/aaa/bbb/ldr/DynamicClassLoader@700F5470/700F547C)
HAR.2036471.Thread (com/aaa/bbb/ldr/DynamicClassLoader@700F5470/700F547C)
WFE.2036474.Thread (com/aaa/bbb/ldr/DynamicClassLoader@700F5470/700F547C)
WFE.2036467.Thread (com/aaa/bbb/ldr/DynamicClassLoader@700F5470/700F547C)
WFE.2036431.Thread (com/aaa/bbb/ldr/DynamicClassLoader@700F5470/700F547C)
WFE.2035835.Thread (com/aaa/bbb/ldr/DynamicClassLoader@700F5470/700F547C)
HAR.2035837.Thread (com/aaa/bbb/ldr/DynamicClassLoader@700F5470/700F547C)
WFE.2035831.Thread (com/aaa/bbb/ldr/DynamicClassLoader@700F5470/700F547C)
HAR.2035839.Thread (com/aaa/bbb/ldr/DynamicClassLoader@700F5470/700F547C)
HAR.2036929.Thread (com/aaa/bbb/ldr/DynamicClassLoader@700F5470/700F547C)
WFE.2035854.Thread (com/aaa/bbb/ldr/DynamicClassLoader@700F5470/700F547C)
HAR.2035838.Thread (com/aaa/bbb/ldr/DynamicClassLoader@700F5470/700F547C)
WFE.2036408.Thread (com/aaa/bbb/ldr/DynamicClassLoader@700F5470/700F547C)
Could you please help me? Why DTMManager class is not cached for all threads?
Have you got a solution regarding XALAN setting or code?
> DTMManager.newInstance issue in a java multithreaded application: excessive
> ClassLoader, threads lock wait, no cache
> --------------------------------------------------------------------------------------------------------------------
>
> Key: XALANJ-2533
> URL: https://issues.apache.org/jira/browse/XALANJ-2533
> Project: XalanJ2
> Issue Type: Bug
> Security Level: No security risk; visible to anyone(Ordinary problems in
> Xalan projects. Anybody can view the issue.)
> Components: DTM
> Environment: AIX 5.3, JDK 1.5 (last fix), XALAN 2.7.0
> Reporter: Christophe DUVAL
>
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