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Support Article

StaticContentResolver IllegalMonitorStateException

SA-30098

Summary



System administrators have noted a frequently occurring exception in the log, with no user impact.


Error Messages



2016-09-18 16:54:27,284 [ WebContainer : 1] [ ] [ ] (tent.StaticContentResolverImpl) ERROR - Caught unhandled error in StaticContentResolver handling request aInput = {}
java.lang.IllegalMonitorStateException
at com.pega.jsr166backport.java.util.concurrent.locks.ReentrantReadWriteLock$Sync.tryReleaseShared(ReentrantReadWriteLock.java:323)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.releaseShared(AbstractQueuedSynchronizer.java:1352)
at com.pega.jsr166backport.java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.unlock(ReentrantReadWriteLock.java:709)
at com.pega.pegarules.priv.FileLockManager$PRFileLock.readUnlock(FileLockManager.java:267)
at com.pega.pegarules.priv.FileLockManager.readUnlock(FileLockManager.java:86)
at com.pega.pegarules.exec.internal.basic.staticcontent.StaticContentResolverImpl.processRequest(StaticContentResolverImpl.java:617)
at com.pega.pegarules.exec.internal.basic.staticcontent.StaticContentResolverImpl.processRequest(StaticContentResolverImpl.java:497)
at com.pega.pegarules.exec.internal.basic.staticcontent.StaticContentResolverImpl.processRequest(StaticContentResolverImpl.java:493)
at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl._getStaticContent_privact(EngineImpl.java:236)
at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl.getStaticContent(EngineImpl.java:205)
at com.pega.pegarules.session.internal.engineinterface.etier.ejb.EngineBean.getStaticContent(EngineBean.java:180)
at sun.reflect.GeneratedMethodAccessor135.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:56)
at java.lang.reflect.Method.invoke(Method.java:620)
at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethod(PRBootstrap.java:338)
at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethodPropagatingThrowable(PRBootstrap.java:379)
at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingThrowable(AppServerBridgeToPega.java:216)
at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingException(AppServerBridgeToPega.java:238)
at com.pega.pegarules.internal.etier.ejb.EngineBeanBoot.getStaticContent(EngineBeanBoot.java:154)
at com.pega.pegarules.internal.etier.interfaces.EJSLocalStatelessEngineBMT_f2439d86.getStaticContent(Unknown Source)
at com.pega.pegarules.web.impl.WebStandardImpl.sendOutput(WebStandardImpl.java:1116)
at com.pega.pegarules.web.impl.WebStandardImpl.doPost(WebStandardImpl.java:315)
at sun.reflect.GeneratedMethodAccessor110.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:56)
at java.lang.reflect.Method.invoke(Method.java:620)
at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethod(PRBootstrap.java:338)
at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethodPropagatingThrowable(PRBootstrap.java:379)
at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingThrowable(AppServerBridgeToPega.java:216)
at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethod(AppServerBridgeToPega.java:265)
at com.pega.pegarules.internal.web.servlet.WebStandardBoot.doPost(WebStandardBoot.java:118)
at com.pega.pegarules.internal.web.servlet.WebStandardBoot.doGet(WebStandardBoot.java:89)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:575)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1230)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:779)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:478)
at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:178)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager.invokeFilters(WebAppFilterManager.java:1071)
at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:87)
at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:914)
at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1662)
at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:200)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:459)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:526)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:312)
at com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpICLReadCallback.java:88)
at com.ibm.ws.ssl.channel.impl.SSLReadServiceContext$SSLReadCompletedCallback.complete(SSLReadServiceContext.java:1818)
at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:175)
at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138)
at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204)
at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775)
at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1864)


Steps to Reproduce



Not applicable


Root Cause



An issue in the custom application code or rules.  

Application uses a custom built attachment display feature that pulls attachments from an archive and streams them to the browser using Pega Engine API call to tools.sendFile() method.


Resolution



Perform the following local-change:

Adjust sendFile() call to send "false" as the parameter that controls whether the file should be deleted from the StaticContent directory.  

Since the file content is getting streamed from memory (coming from the external storage app), there is no content in ServiceExport to delete - and this was causing the exception shown above.

 

 

Suggest Edit

Published November 18, 2016 - Updated October 8, 2020

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