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From alexey <ale...@blueseasoft.co.il>
Subject sometimes java.lang.NullPointerException
Date Sun, 28 Sep 2014 14:18:35 GMT
I'm using activemq 5.9.0 and sometimes get the following exception:

INFO   | jvm 1    | 2014/09/08 13:14:14 | Exception in thread "ActiveMQ
BrokerService[ig2-4] Task-15" java.lang.NullPointerException
INFO   | jvm 1    | 2014/09/08 13:14:14 | 	at
org.apache.activemq.openwire.v5.BaseDataStreamMarshaller.tightMarshalByteSequence2(BaseDataStreamMarshaller.java:431)
INFO   | jvm 1    | 2014/09/08 13:14:14 | 	at
org.apache.activemq.openwire.v5.MessageMarshaller.tightMarshal2(MessageMarshaller.java:181)
INFO   | jvm 1    | 2014/09/08 13:14:14 | 	at
org.apache.activemq.openwire.v5.ActiveMQMessageMarshaller.tightMarshal2(ActiveMQMessageMarshaller.java:89)
INFO   | jvm 1    | 2014/09/08 13:14:14 | 	at
org.apache.activemq.openwire.v5.ActiveMQBytesMessageMarshaller.tightMarshal2(ActiveMQBytesMessageMarshaller.java:89)
INFO   | jvm 1    | 2014/09/08 13:14:14 | 	at
org.apache.activemq.openwire.OpenWireFormat.tightMarshalNestedObject2(OpenWireFormat.java:433)
INFO   | jvm 1    | 2014/09/08 13:14:14 | 	at
org.apache.activemq.openwire.v5.BaseDataStreamMarshaller.tightMarshalNestedObject2(BaseDataStreamMarshaller.java:136)
INFO   | jvm 1    | 2014/09/08 13:14:14 | 	at
org.apache.activemq.openwire.v5.MessageDispatchMarshaller.tightMarshal2(MessageDispatchMarshaller.java:105)
INFO   | jvm 1    | 2014/09/08 13:14:14 | 	at
org.apache.activemq.openwire.OpenWireFormat.marshal(OpenWireFormat.java:243)
INFO   | jvm 1    | 2014/09/08 13:14:14 | 	at
org.apache.activemq.transport.tcp.TcpTransport.oneway(TcpTransport.java:175)
INFO   | jvm 1    | 2014/09/08 13:14:14 | 	at
org.apache.activemq.transport.AbstractInactivityMonitor.doOnewaySend(AbstractInactivityMonitor.java:304)
INFO   | jvm 1    | 2014/09/08 13:14:14 | 	at
org.apache.activemq.transport.AbstractInactivityMonitor.oneway(AbstractInactivityMonitor.java:286)
INFO   | jvm 1    | 2014/09/08 13:14:14 | 	at
org.apache.activemq.transport.TransportFilter.oneway(TransportFilter.java:85)
INFO   | jvm 1    | 2014/09/08 13:14:14 | 	at
org.apache.activemq.transport.WireFormatNegotiator.oneway(WireFormatNegotiator.java:104)
INFO   | jvm 1    | 2014/09/08 13:14:14 | 	at
org.apache.activemq.transport.MutexTransport.oneway(MutexTransport.java:68)
INFO   | jvm 1    | 2014/09/08 13:14:14 | 	at
org.apache.activemq.broker.TransportConnection.dispatch(TransportConnection.java:1339)
INFO   | jvm 1    | 2014/09/08 13:14:14 | 	at
org.apache.activemq.broker.TransportConnection.processDispatch(TransportConnection.java:858)
INFO   | jvm 1    | 2014/09/08 13:14:14 | 	at
org.apache.activemq.broker.TransportConnection.iterate(TransportConnection.java:904)
INFO   | jvm 1    | 2014/09/08 13:14:14 | 	at
org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.java:129)
INFO   | jvm 1    | 2014/09/08 13:14:14 | 	at
org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:47)
INFO   | jvm 1    | 2014/09/08 13:14:14 | 	at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
INFO   | jvm 1    | 2014/09/08 13:14:14 | 	at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
INFO   | jvm 1    | 2014/09/08 13:14:14 | 	at
java.lang.Thread.run(Thread.java:722)



It happens with traffic and without. I have investigated little bit the
source code and found out that it may happen when broker tries to send a
message without header parameters (it checks the length of marshaled
parameters when it is null). The questions are:
Why the broker tries to send a message without header parameters even if
there is no traffic?
Can it harm in any way and if so, then how would it harm?
How can I configure the broker to prevent that exception?

Thank you.



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