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From Celso Pinto <cpi...@yimports.com>
Subject Jackrabbit 1.6.1: deadlocks on add/delete files
Date Mon, 25 Jul 2011 19:07:08 GMT
Hi everyone,

in a Liferay cluster setup (Jackrabbit is also configured to work in
cluster mode), users were banging away, happily adding files to the
content repository until it came to a point where the servers started
denying service. A bit of digging revealed some deadlock issues
(thread dumps after the break). I checked out Jackrabbit's JIRA and
found a few issues related to deadlocks but nothing that appeared to
be related with this specific issue. I understand that 1.6.1 is a bit
old and upgrading to 1.6.4 could be an option if it fixes this issue
(couldn't figure it out from reading the release notes or 1.6.2 and
1.6.4).

As anyone experienced something like this as well? How did you go
about fixing it?

TIA.

Regards,
Celso

===== Thread dumps =====

( **** deadlock detected by jstack ***** )


Java stack information for the threads listed above:
===================================================
"httpSSLWorkerThread-48080-21":
        at org.apache.jackrabbit.core.state.NodeState.getChildNodeEntry(NodeState.java:300)
        - waiting to lock <0xffffffff502af0f0> (a
org.apache.jackrabbit.core.state.NodeState)
        at org.apache.jackrabbit.core.CachingHierarchyManager.nodeModified(CachingHierarchyManager.java:316)
        - locked <0xffffffff4fbc75e8> (a java.lang.Object)
        at org.apache.jackrabbit.core.CachingHierarchyManager.stateModified(CachingHierarchyManager.java:293)
        at org.apache.jackrabbit.core.state.StateChangeDispatcher.notifyStateModified(StateChangeDispatcher.java:111)
        at org.apache.jackrabbit.core.state.SessionItemStateManager.stateModified(SessionItemStateManager.java:889)
        at org.apache.jackrabbit.core.state.StateChangeDispatcher.notifyStateModified(StateChangeDispatcher.java:111)
        at org.apache.jackrabbit.core.state.LocalItemStateManager.stateModified(LocalItemStateManager.java:452)
        at org.apache.jackrabbit.core.state.XAItemStateManager.stateModified(XAItemStateManager.java:602)
        at org.apache.jackrabbit.core.state.StateChangeDispatcher.notifyStateModified(StateChangeDispatcher.java:111)
        at org.apache.jackrabbit.core.state.SharedItemStateManager.stateModified(SharedItemStateManager.java:400)
        at org.apache.jackrabbit.core.state.ItemState.notifyStateUpdated(ItemState.java:244)
        at org.apache.jackrabbit.core.state.ChangeLog.persisted(ChangeLog.java:297)
        at org.apache.jackrabbit.core.state.SharedItemStateManager$Update.end(SharedItemStateManager.java:749)
        at org.apache.jackrabbit.core.state.SharedItemStateManager.update(SharedItemStateManager.java:1115)
        at org.apache.jackrabbit.core.state.LocalItemStateManager.update(LocalItemStateManager.java:351)
        at org.apache.jackrabbit.core.state.XAItemStateManager.update(XAItemStateManager.java:354)
        at org.apache.jackrabbit.core.state.LocalItemStateManager.update(LocalItemStateManager.java:326)
        at org.apache.jackrabbit.core.state.XAItemStateManager.update(XAItemStateManager.java:354)
        at org.apache.jackrabbit.core.state.LocalItemStateManager.update(LocalItemStateManager.java:326)
        at org.apache.jackrabbit.core.state.SessionItemStateManager.update(SessionItemStateManager.java:325)
        at org.apache.jackrabbit.core.ItemImpl.save(ItemImpl.java:1111)
        - locked <0xffffffff501962d8> (a
org.apache.jackrabbit.core.XASessionImpl)
        at org.apache.jackrabbit.core.SessionImpl.save(SessionImpl.java:915)
        at com.liferay.documentlibrary.util.JCRHook.deleteFile(JCRHook.java:351)
        at com.liferay.documentlibrary.util.HookProxyImpl.deleteFile(HookProxyImpl.java:101)
        at com.liferay.documentlibrary.util.SafeFileNameHookWrapper.deleteFile(SafeFileNameHookWrapper.java:146)
        at com.liferay.documentlibrary.service.impl.DLServiceImpl.deleteFile(DLServiceImpl.java:105)
        at sun.reflect.GeneratedMethodAccessor2144.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
        at com.liferay.portal.dao.jdbc.aop.DynamicDataSourceTransactionInterceptor.invoke(DynamicDataSourceTransactionInterceptor.java:44)
        at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:58)
        at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:58)
        at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:58)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
        at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
        at $Proxy163.deleteFile(Unknown Source)
        at com.liferay.documentlibrary.service.DLServiceUtil.deleteFile(DLServiceUtil.java:73)
        at com.liferay.portal.image.DLHook.updateImage(DLHook.java:93)
        at com.liferay.portal.service.impl.ImageLocalServiceImpl.updateImage(ImageLocalServiceImpl.java:315)
        at com.liferay.portal.service.impl.ImageLocalServiceImpl.updateImage(ImageLocalServiceImpl.java:271)
        at sun.reflect.GeneratedMethodAccessor2141.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
        at com.liferay.portal.dao.jdbc.aop.DynamicDataSourceTransactionInterceptor.invoke(DynamicDataSourceTransactionInterceptor.java:44)
        at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:58)
        at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:58)
        at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:58)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
        at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
        at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
        at $Proxy38.updateImage(Unknown Source)
        at com.liferay.portlet.imagegallery.service.impl.IGImageLocalServiceImpl.saveScaledImage(IGImageLocalServiceImpl.java:689)
        at com.liferay.portlet.imagegallery.service.impl.IGImageLocalServiceImpl.updateSmallImage(IGImageLocalServiceImpl.java:615)
        at sun.reflect.GeneratedMethodAccessor2143.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
        at com.liferay.portal.dao.jdbc.aop.DynamicDataSourceTransactionInterceptor.invoke(DynamicDataSourceTransactionInterceptor.java:44)
        at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:58)
        at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:58)
        at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:58)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
        at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
        at $Proxy214.updateSmallImage(Unknown Source)
        at com.liferay.portlet.imagegallery.service.IGImageLocalServiceUtil.updateSmallImage(IGImageLocalServiceUtil.java:495)
        at com.liferay.portal.servlet.ImageServlet.checkIGImageThumbnailMaxDimensions(ImageServlet.java:145)
        at com.liferay.portal.servlet.ImageServlet.getImage(ImageServlet.java:223)
        at com.liferay.portal.servlet.ImageServlet.writeImage(ImageServlet.java:353)
        at com.liferay.portal.servlet.ImageServlet.service(ImageServlet.java:121)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
        at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:427)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:333)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
        at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:196)
        at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:126)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
        at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:196)
        at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:126)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
        at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:196)
        at com.liferay.portal.servlet.filters.header.HeaderFilter.processFilter(HeaderFilter.java:129)
        at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:123)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
        at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:196)
        at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:126)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
        at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:196)
        at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:126)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
        at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:196)
        at com.liferay.portal.servlet.filters.virtualhost.VirtualHostFilter.processFilter(VirtualHostFilter.java:239)
        at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:123)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
        at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:196)
        at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:126)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
        at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:196)
        at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:126)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
        at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:738)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
        at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:196)
        at com.liferay.portal.servlet.filters.threadlocal.ThreadLocalFilter.processFilter(ThreadLocalFilter.java:35)
        at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:123)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
        at pt.segsocial.npss2.filtros.Npss2EncodingFilter.doFilter(Npss2EncodingFilter.java:47)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:313)
        at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:287)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:218)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
        at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:94)
        at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:98)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:222)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1093)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:166)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1093)
        at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:291)
        at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:676)
        at com.sun.enterprise.web.connector.grizzly.comet.CometEngine.executeServlet(CometEngine.java:664)
        at com.sun.enterprise.web.connector.grizzly.comet.CometEngine.handle(CometEngine.java:409)
        at com.sun.enterprise.web.connector.grizzly.comet.CometAsyncFilter.doFilter(CometAsyncFilter.java:86)
        at com.sun.enterprise.web.connector.grizzly.async.DefaultAsyncExecutor.invokeFilters(DefaultAsyncExecutor.java:196)
        at com.sun.enterprise.web.connector.grizzly.async.DefaultAsyncExecutor.interrupt(DefaultAsyncExecutor.java:171)
        at com.sun.enterprise.web.connector.grizzly.async.AsyncProcessorTask.doTask(AsyncProcessorTask.java:96)
        at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:269)
        at com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWorkerThread.java:111)
"httpSSLWorkerThread-48080-12":
        at org.apache.jackrabbit.core.CachingHierarchyManager.nodeRemoved(CachingHierarchyManager.java:452)
        - waiting to lock <0xffffffff4fbc75e8> (a java.lang.Object)
        at org.apache.jackrabbit.core.state.StateChangeDispatcher.notifyNodeRemoved(StateChangeDispatcher.java:207)
        at org.apache.jackrabbit.core.state.SessionItemStateManager.nodeRemoved(SessionItemStateManager.java:983)
        at org.apache.jackrabbit.core.state.NodeState.notifyNodeRemoved(NodeState.java:901)
        at org.apache.jackrabbit.core.state.NodeState.removeChildNodeEntry(NodeState.java:388)
        - locked <0xffffffff502af0f0> (a
org.apache.jackrabbit.core.state.NodeState)
        at org.apache.jackrabbit.core.NodeImpl.removeChildNode(NodeImpl.java:615)
        at org.apache.jackrabbit.core.ItemImpl.internalRemove(ItemImpl.java:847)
        at org.apache.jackrabbit.core.ItemImpl.remove(ItemImpl.java:919)
        at com.liferay.documentlibrary.util.JCRHook.deleteFile(JCRHook.java:349)
        at com.liferay.documentlibrary.util.HookProxyImpl.deleteFile(HookProxyImpl.java:101)
        at com.liferay.documentlibrary.util.SafeFileNameHookWrapper.deleteFile(SafeFileNameHookWrapper.java:146)
        at com.liferay.documentlibrary.service.impl.DLServiceImpl.deleteFile(DLServiceImpl.java:105)
        at sun.reflect.GeneratedMethodAccessor2144.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
        at com.liferay.portal.dao.jdbc.aop.DynamicDataSourceTransactionInterceptor.invoke(DynamicDataSourceTransactionInterceptor.java:44)
        at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:58)
        at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:58)


( **** another deadlock that causes resource exhaustion ***** )

"httpSSLWorkerThread-48080-7" daemon prio=3 tid=0x0000000101820800
nid=0x2eb in Object.wait() [0xfffffffe413f7000]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0xffffffff195cc290> (a
EDU.oswego.cs.dl.util.concurrent.WriterPreferenceReadWriteLock$WriterLock)
        at java.lang.Object.wait(Object.java:485)
        at EDU.oswego.cs.dl.util.concurrent.WriterPreferenceReadWriteLock$WriterLock.acquire(Unknown
Source)
        - locked <0xffffffff195cc290> (a
EDU.oswego.cs.dl.util.concurrent.WriterPreferenceReadWriteLock$WriterLock)
        at org.apache.jackrabbit.core.journal.AbstractJournal.lockAndSync(AbstractJournal.java:245)
        at org.apache.jackrabbit.core.journal.DefaultRecordProducer.append(DefaultRecordProducer.java:51)
        at org.apache.jackrabbit.core.cluster.ClusterNode$WorkspaceUpdateChannel.updateCreated(ClusterNode.java:602)
        at org.apache.jackrabbit.core.state.SharedItemStateManager$Update.begin(SharedItemStateManager.java:554)
        at org.apache.jackrabbit.core.state.SharedItemStateManager.beginUpdate(SharedItemStateManager.java:1085)
        at org.apache.jackrabbit.core.state.SharedItemStateManager.update(SharedItemStateManager.java:1115)
        at org.apache.jackrabbit.core.state.LocalItemStateManager.update(LocalItemStateManager.java:351)
        at org.apache.jackrabbit.core.state.LocalItemStateManager.update(LocalItemStateManager.java:326)
        at org.apache.jackrabbit.core.version.AbstractVersionManager$WriteOperation.save(AbstractVersionManager.java:189)
        at org.apache.jackrabbit.core.version.AbstractVersionManager.createVersionHistory(AbstractVersionManager.java:369)
        at org.apache.jackrabbit.core.version.VersionManagerImpl$1.run(VersionManagerImpl.java:221)
        at org.apache.jackrabbit.core.version.VersionManagerImpl$DynamicESCFactory.doSourced(VersionManagerImpl.java:586)
        - locked <0xffffffff4f386e70> (a
org.apache.jackrabbit.core.version.VersionManagerImpl$DynamicESCFactory)
        at org.apache.jackrabbit.core.version.VersionManagerImpl.createVersionHistory(VersionManagerImpl.java:218)
        at org.apache.jackrabbit.core.version.XAVersionManager.createVersionHistory(XAVersionManager.java:157)
        at org.apache.jackrabbit.core.version.AbstractVersionManager.getVersionHistory(AbstractVersionManager.java:273)
        at org.apache.jackrabbit.core.ItemImpl.initVersionHistories(ItemImpl.java:738)
        at org.apache.jackrabbit.core.ItemImpl.save(ItemImpl.java:1088)
        - locked <0xffffffff501961f8> (a
org.apache.jackrabbit.core.XASessionImpl)
        at org.apache.jackrabbit.core.SessionImpl.save(SessionImpl.java:915)
        at com.liferay.documentlibrary.util.JCRHook.addFile(JCRHook.java:143)
        at com.liferay.documentlibrary.util.HookProxyImpl.addFile(HookProxyImpl.java:74)
        at com.liferay.documentlibrary.util.SafeFileNameHookWrapper.addFile(SafeFileNameHookWrapper.java:100)
        at com.liferay.documentlibrary.service.impl.DLLocalServiceImpl.addFile(DLLocalServiceImpl.java:71)
        at sun.reflect.GeneratedMethodAccessor1419.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
        at com.liferay.portal.dao.jdbc.aop.DynamicDataSourceTransactionInterceptor.invoke(DynamicDataSourceTransactionInterceptor.java:44)
        at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:58)
        at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:58)
        at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:58)

( ****** sample thread that is holding on to database resources ******** )

"httpSSLWorkerThread-48080-180" daemon prio=3 tid=0x0000000103246000
nid=0x58aad waiting for monitor entry [0xfffffffe197f3000]
   java.lang.Thread.State: BLOCKED (on object monitor)
        at org.apache.jackrabbit.core.version.VersionManagerImpl$DynamicESCFactory.doSourced(VersionManagerImpl.java:584)
        - waiting to lock <0xffffffff4f386e70> (a
org.apache.jackrabbit.core.version.VersionManagerImpl$DynamicESCFactory)
        at org.apache.jackrabbit.core.version.VersionManagerImpl.createVersionHistory(VersionManagerImpl.java:218)
        at org.apache.jackrabbit.core.version.XAVersionManager.createVersionHistory(XAVersionManager.java:157)
        at org.apache.jackrabbit.core.version.AbstractVersionManager.getVersionHistory(AbstractVersionManager.java:273)
        at org.apache.jackrabbit.core.ItemImpl.initVersionHistories(ItemImpl.java:738)
        at org.apache.jackrabbit.core.ItemImpl.save(ItemImpl.java:1088)
        - locked <0xffffffff5f247110> (a
org.apache.jackrabbit.core.XASessionImpl)
        at org.apache.jackrabbit.core.SessionImpl.save(SessionImpl.java:915)
        at com.liferay.documentlibrary.util.JCRHook.addFile(JCRHook.java:143)

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