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    PojoCacheException when trying to attach a java object (POJO) to the PojoCache.
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    created by <a href="http://community.jboss.org/people/mpark">MeeNam Park</a> in <i>JBoss Cache</i> - <a href="http://community.jboss.org/message/600138#600138">View the full discussion</a>
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<div class="jive-rendered-content"><p>On our project, we are using JBOSS Cache to replicate ~20,000 simple POJO objects among 28 jvm&rsquo;s.&#160;&#160; When attaching a java object (POJO) to the PojoCache, we get &ldquo;PojoCacheException&#8221;.&#160; When this occurs, most of the subsequent attempt to attach additional POJO to the PojoCache result in the same exception.&#160; When the application (Jvm) is restarted, sometime this problem goes away.&#160;&#160;&#160; </p><p style="min-height: 8pt; height: 8pt; padding: 0px;">&#160;</p><p>This PojoCacheException problem does not occur 100% &ndash; however, when it happens, it usually happens when adding the 1<sup>st</sup> POJO to the PojoCache, and usually, all subsequent POJO attachment will fail.</p><p>PojoCacheException logged indicate all exceptions appear to be cause by one of the 2 root causes:</p><ul><li><span style="font-size: 10pt;">-&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </span><span style="font-size: 10pt;">&ldquo;Root cause is Suspected member:&#160; 192.168.209.108:60978&#8221;</span></li><li><span style="font-size: 10pt;">-&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </span><span style="font-size: 10pt;">&ldquo;Root cause is State retrieval timed out waiting for flush unblock.&#160; (timeout = 80000 millis)&#8221;</span></li></ul><p>The port number (60978) sited is different for different runs.&#160; Any idea what&rsquo;s causing either of the problems?&#160;&#160; Would like to know if the ip &amp; port sited as root cause have anything to do with JGroup?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;">&#160;</p><p>Our project has 2 redundant servers that are deployed on <strong>JBOSS-5.0.0 GA</strong>, using <strong>jbosscache-core-3.0.0.GA and jbosscache-pojo-3.0.0.GA </strong>which are included in the JBOSS-5.0.0 GA.&#160; All the POJO attachment is being on the servers deployed on the JBOSS appserver, thereforefore, all of the PojoCacheExceptions are coming from the JBOSS jvm&rsquo;s.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;">&#160;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;">&#160;</p><p>Below is the PojoCacheException stack trace for the 2 types of PojoCacheExceptions we&rsquo;re seeing:</p><p><span style="font-size: 10pt;">Org.jboss.cache.pojo.PojoCacheException:&#160; attach failed &ldquo;OBJECT KEY&#8221;</span></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; At org.jboss.cache.pojo.impl.PojoCacheImpl.attach(PojoCacheImpl.java:111)</span></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; At org.jboss.cache.pojo.impl.PojoCacheImpl.attach(PojoCacheImpl.java:93)</span></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; At org.jboss.cache.pojo.impl.PojoCacheImpl.attach(PojoCacheImpl.java:88)</span></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; At java.lang.Thread.run (Thread.java:619)</span></p><p><strong style="color: red;">Caused by:&#160; org.jboss.cache.SuspectException:&#160; Suspected member:&#160; 192.168.209.108:60978</strong></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; At org.jboss.cache.RPCManagerImpl.callRemoteMethods (RPCManagerImpl.java:472)</span></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; At org.jboss.cache.RPCManagerImpl.callRemoteMethods (RPCManagerImpl.java:432)</span></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; At org.jboss.cache.RPCManagerImpl.callRemoteMethods (RPCManagerImpl.java:437)</span></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; At org.jboss.cache.interceptors.BaseRpcInterceptor.replicateCall (BaseRpcInterceptor.java:161)</span></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; At org.jboss.cache.interceptors.BaseRpcInterceptor.replicateCall (BaseRpcInterceptor.java:135)</span></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; At org.jboss.cache.interceptors.BaseRpcInterceptor.replicateCall (BaseRpcInterceptor.java:107)</span></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; At org.jboss.cache.interceptors.ReplicationInterceptor.handleCrudeMethod (ReplicationInterceptor.java:160)</span></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; at org.jboss.cache.interceptors.ReplicationInterceptor.visitPutKeyValueCommand(ReplicationInterceptor.java:107)</span></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; at org.jboss.cache.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:100)</span></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; at org.jboss.cache.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:116)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.interceptors.base.CommandInterceptor.handleDefault(CommandInterceptor.java:131)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.commands.AbstractVisitor.visitPutKeyValueCommand(AbstractVisitor.java:65)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:100)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.interceptors.based.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:116)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.interceptors.CacheMgmtInterceptor.visitPutKeyValueCommand(CacheMgmtInterceptor.java:119)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:100)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:116)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.interceptors.InvocationContextInterceptor.handleAll(InvocationContextInterceptor.java:178)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.interceptors.InvocationContextInterceptor.visitPutKeyValueCommand(InvocationContextInterceptor.java:82)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:100)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.interceptors.InterceptorChain.invoke(InterceptorChain.java:265)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.interceptors.InterceptorChain.invoke(InterceptorChain.java:560)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.pojo.impl.InternalHelper.lockPojo(InternalHelper.java:342)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.pojo.impl.PojoCacheDelegate.putObject(PojoCacheDelegate.java:101)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.pojo.impl.PojoCacheImpl.attach(PojoCacheImpl.java:102)</span></p><p><strong style="color: red;">Root cause is Suspected member:&#160; 192.168.209.108:60978</strong></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"><span style="font-size: 10pt;"> </span>&#160;</p><p>*************************************************************************</p><p style="min-height: 8pt; height: 8pt; padding: 0px;">&#160;</p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; at org.jboss.cache.pojo.impl.PojoCacheImpl.attach(PojoCacheImpl.java:111)</span></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; at org.jboss.cache.pojo.impl.PojoCacheImpl.attach(PojoCacheImpl.java:93)</span></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; at org.jboss.cache.pojo.impl.PojoCacheImpl.attach(PojoCacheImpl.java:88)</span></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; at java.lang.Thread.run (Thread.java:619)</span></p><p><strong style="color: red;">Caused by:&#160; org.jboss.cache.lock.TimeoutException:&#160; state retrieval timed out waiting for flush unblock.&#160; (timeout = 80000 milis)</strong></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; at org.jboss.cache.RPCManagerImpl.callRemoteMethods(RPCManagerImpl.java:455)</span></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; at org.jboss.cache.RPCManagerImpl.callRemoteMethods(RPCManagerImpl.java:432)</span></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; at org.jboss.cache.RPCManagerImpl.callRemoteMethods(RPCManagerImpl.java:437)</span></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; at org.jboss.cache.interceptors.BaseRpcInterceptor.replicateCall(BaseRpcInterceptor.java:161)</span></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; at org.jboss.cache.interceptors.BaseRpcInterceptor.replicateCall(BaseRpcInterceptor.java:135)</span></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; at org.jboss.cache.interceptors.BaseRpcInterceptor.replicateCall(BaseRpcInterceptor.java:107)</span></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; at org.jboss.cache.interceptors.ReplicationInterceptor.handleCrudeMethod(ReplicationInterceptor.java:160)</span></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; at org.jboss.cache.interceptors.ReplicationInterceptor.visitPutKeyValueCommand(ReplicationInterceptor.java:107)</span></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; at org.jboss.cache.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:100)</span></p><p><span style="font-size: 10pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; at org.jboss.cache.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:116)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.interceptors.base.CommandInterceptor.handleDefault(CommandInterceptor.java:131)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.commands.AbstractVisitor.visitPutKeyValueCommand(AbstractVisitor.java:65)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:100)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.interceptors.based.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:116)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.interceptors.CacheMgmtInterceptor.visitPutKeyValueCommand(CacheMgmtInterceptor.java:119)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:100)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:116)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.interceptors.InvocationContextInterceptor.handleAll(InvocationContextInterceptor.java:178)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.interceptors.InvocationContextInterceptor.visitPutKeyValueCommand(InvocationContextInterceptor.java:82)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:100)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.interceptors.InterceptorChain.invoke(InterceptorChain.java:265)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.interceptors.InterceptorChain.invoke(InterceptorChain.java:560)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.pojo.impl.InternalHelper.lockPojo(InternalHelper.java:342)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.pojo.impl.PojoCacheDelegate.putObject(PojoCacheDelegate.java:101)</span></p><p style="text-indent: 0.5in;"><span style="font-size: 10pt;">at org.jboss.cache.pojo.impl.PojoCacheImpl.attach(PojoCacheImpl.java:102)</span></p><p><strong style="color: red;">Root cause is State retrieval timed out waiting for flush unblock.&#160; (timeout = 80000 millis)</strong></p></div>

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