[infinispan-issues] [JBoss JIRA] Commented: (ISPN-1038) NullPointerException in L1ManagerImpl during IllegalMonitorTest

NullPointerException in L1ManagerImpl during IllegalMonitorTest --------------------------------------------------------------- Key: ISPN-1038 URL: https://issues.jboss.org/browse/ISPN-1038 Project: Infinispan Issue Type: Bug Components: Core API Affects Versions: 5.0.0.BETA1 Reporter: Dan Berindei Assignee: Pete Muir Fix For: 5.0.0.CR1 I have seen NPEs with two different stack traces during tests: 1) java.lang.NullPointerException at java.util.AbstractCollection.addAll(AbstractCollection.java:320) at org.infinispan.distribution.L1ManagerImpl.buildInvalidationAddressList(L1ManagerImpl.java:100) at org.infinispan.distribution.L1ManagerImpl.flushCache(L1ManagerImpl.java:56) at org.infinispan.interceptors.DistributionInterceptor.handleWriteCommand(DistributionInterceptor.java:390) at org.infinispan.interceptors.DistributionInterceptor.visitRemoveCommand(DistributionInterceptor.java:218) at org.infinispan.commands.write.RemoveCommand.acceptVisitor(RemoveCommand.java:70) at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:118) at org.infinispan.interceptors.LockingInterceptor.visitRemoveCommand(LockingInterceptor.java:325) at org.infinispan.commands.write.RemoveCommand.acceptVisitor(RemoveCommand.java:70) at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:118) at org.infinispan.interceptors.base.CommandInterceptor.handleDefault(CommandInterceptor.java:132) at org.infinispan.commands.AbstractVisitor.visitRemoveCommand(AbstractVisitor.java:63) at org.infinispan.commands.write.RemoveCommand.acceptVisitor(RemoveCommand.java:70) at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:118) at org.infinispan.interceptors.TxInterceptor.enlistWriteAndInvokeNext(TxInterceptor.java:186) at org.infinispan.interceptors.TxInterceptor.visitRemoveCommand(TxInterceptor.java:139) at org.infinispan.interceptors.DistTxInterceptor.visitRemoveCommand(DistTxInterceptor.java:86) at org.infinispan.commands.write.RemoveCommand.acceptVisitor(RemoveCommand.java:70) at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:118) at org.infinispan.interceptors.InvocationContextInterceptor.handleAll(InvocationContextInterceptor.java:95) at org.infinispan.interceptors.InvocationContextInterceptor.handleDefault(InvocationContextInterceptor.java:62) at org.infinispan.commands.AbstractVisitor.visitRemoveCommand(AbstractVisitor.java:63) at org.infinispan.commands.write.RemoveCommand.acceptVisitor(RemoveCommand.java:70) at org.infinispan.interceptors.InterceptorChain.invoke(InterceptorChain.java:273) at org.infinispan.CacheDelegate.remove(CacheDelegate.java:226) at org.infinispan.distribution.IllegalMonitorTest.testScenario(IllegalMonitorTest.java:64) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:636)... Removed 11 stack frames 2) org.infinispan.CacheException: java.lang.NullPointerException at org.infinispan.remoting.rpc.RpcManagerImpl.invokeRemotely(RpcManagerImpl.java:116) ... at org.infinispan.distribution.IllegalMonitorTest.testScenario(IllegalMonitorTest.java:63) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:636) Caused by: java.lang.NullPointerException at org.infinispan.distribution.L1ManagerImpl.addRequestor(L1ManagerImpl.java:47) at org.infinispan.interceptors.DistributionInterceptor.visitPutKeyValueCommand(DistributionInterceptor.java:203) at org.infinispan.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:76) at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:118) at org.infinispan.interceptors.LockingInterceptor.visitPutKeyValueCommand(LockingInterceptor.java:297) at org.infinispan.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:76) at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:118) at org.infinispan.interceptors.base.CommandInterceptor.handleDefault(CommandInterceptor.java:132) at org.infinispan.commands.AbstractVisitor.visitPutKeyValueCommand(AbstractVisitor.java:59) at org.infinispan.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:76) at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:118) at org.infinispan.interceptors.TxInterceptor.enlistWriteAndInvokeNext(TxInterceptor.java:186) at org.infinispan.interceptors.TxInterceptor.visitPutKeyValueCommand(TxInterceptor.java:134) at org.infinispan.interceptors.DistTxInterceptor.visitPutKeyValueCommand(DistTxInterceptor.java:79) at org.infinispan.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:76) at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:118) at org.infinispan.interceptors.InvocationContextInterceptor.handleAll(InvocationContextInterceptor.java:95) at org.infinispan.interceptors.InvocationContextInterceptor.handleDefault(InvocationContextInterceptor.java:62) at org.infinispan.commands.AbstractVisitor.visitPutKeyValueCommand(AbstractVisitor.java:59) at org.infinispan.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:76) ... Looks like cleanupRequestors() should also use synchronization. It might also be better to lock on the requestors map values instead of the keys, as the keys can be also locked by user code.