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From npenkov <nick.pen...@gmail.com>
Subject NullPointerException in DemandForwarding
Date Tue, 23 May 2006 14:08:18 GMT

In SVN HEAD:

Suppose we have 2 routers - AMQ1 and AMQ2
We use persitent storage.

1. We post messages on AMQ1
2. We consume messages on AMQ2 (Queue is bridged from AMQ1)

Everithing is fine till restarting routers:

Problem:

1. We start AMQ2
2. Post messages
3. Stop AMQ2

4. Start AMQ1
5. Start consumer on AMQ1 (If we don't start it - it will not break)
6. Start AMQ2 (We have already posted 10 test messages and expect to consume
them on AMQ1)

java.lang.NullPointerException
        at
org.apache.activemq.network.DemandForwardingBridgeSupport.doCreateDemandSubscription(DemandForwardingBridgeSupport.java:763)
        at
org.apache.activemq.network.DemandForwardingBridgeSupport.createDemandSubscription(DemandForwardingBridgeSupport.java:754)
        at
org.apache.activemq.network.DemandForwardingBridgeSupport.serviceRemoteConsumerAdvisory(DemandForwardingBridgeSupport.java:355)
        at
org.apache.activemq.network.DemandForwardingBridgeSupport.serviceRemoteCommand(DemandForwardingBridgeSupport.java:307)
        at
org.apache.activemq.network.DemandForwardingBridgeSupport$2.onCommand(DemandForwardingBridgeSupport.java:124)
        at
org.apache.activemq.transport.ResponseCorrelator.onCommand(ResponseCorrelator.java:97)
        at
org.apache.activemq.transport.TransportFilter.onCommand(TransportFilter.java:63)
        at
org.apache.activemq.transport.failover.FailoverTransport$1.onCommand(FailoverTransport.java:105)
        at
org.apache.activemq.transport.WireFormatNegotiator.onCommand(WireFormatNegotiator.java:114)
        at
org.apache.activemq.transport.InactivityMonitor.onCommand(InactivityMonitor.java:122)
        at
org.apache.activemq.transport.TransportSupport.doConsume(TransportSupport.java:87)
        at
org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:143)
        at java.lang.Thread.run(Thread.java:534)
        
NullPointerException is fired because localSessionInfo in
DemandForwardingBridgeSupport was not created yet. So my sollution is on
line 763 - before:

result.getLocalInfo().setConsumerId(new
ConsumerId(localSessionInfo.getSessionId(),consumerIdGenerator
                        .getNextSequenceId()));

add:
if(localSessionInfo == null) startLocalBridge();                        
--
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