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If you get a stack trace like this when you try to publish, then you may have typo'd the exchange type in your queue or topic declaration. Open your virtualhosts.xml and check that the

No Format
<exchange>amq.direct</exchange>

is set to amq.direct for the /<queue///> element you're trying to publish to.

No Format
2009-01-12 15:26:27,957 ERROR [pool-11-thread-2] protocol.AMQMinaProtocolSession (AMQMinaProtocolSession.java:365) - Unexpected exception while processing frame. Closing connection. 
java.lang.NullPointerException 
        at org.apache.qpid.server.security.access.PrincipalPermissions.authorise(PrincipalPermissions.java:398) 
        at org.apache.qpid.server.security.access.plugins.SimpleXML.authorise(SimpleXML.java:302) 
        at org.apache.qpid.server.handler.QueueBindHandler.methodReceived(QueueBindHandler.java:111) 
        at org.apache.qpid.server.handler.ServerMethodDispatcherImpl.dispatchQueueBind(ServerMethodDispatcherImpl.java:498) 
        at org.apache.qpid.framing.amqp_8_0.QueueBindBodyImpl.execute(QueueBindBodyImpl.java:167) 
        at org.apache.qpid.server.state.AMQStateManager.methodReceived(AMQStateManager.java:204) 
        at org.apache.qpid.server.protocol.AMQMinaProtocolSession.methodFrameReceived(AMQMinaProtocolSession.java:295) 
        at org.apache.qpid.framing.AMQMethodBodyImpl.handle(AMQMethodBodyImpl.java:93) 
        at org.apache.qpid.server.protocol.AMQMinaProtocolSession.frameReceived(AMQMinaProtocolSession.java:235) 
        at org.apache.qpid.server.protocol.AMQMinaProtocolSession.dataBlockReceived(AMQMinaProtocolSession.java:191) 
        at org.apache.qpid.server.protocol.AMQPFastProtocolHandler.messageReceived(AMQPFastProtocolHandler.java:244) 
        at com.jpmorgan.qpid.org.apache.mina.common.support.AbstractIoFilterChain$TailFilter.messageReceived(AbstractIoFilterChain.java:703) 
        at com.jpmorgan.qpid.org.apache.mina.common.support.AbstractIoFilterChain.callNextMessageReceived(AbstractIoFilterChain.java:362) 
        at com.jpmorgan.qpid.org.apache.mina.common.support.AbstractIoFilterChain.access$1200(AbstractIoFilterChain.java:54) 
        at com.jpmorgan.qpid.org.apache.mina.common.support.AbstractIoFilterChain$EntryImpl$1.messageReceived(AbstractIoFilterChain.java:800) 
        at org.apache.qpid.pool.PoolingFilter.messageReceived(PoolingFilter.java:371) 
        at com.jpmorgan.qpid.org.apache.mina.filter.ReferenceCountingIoFilter.messageReceived(ReferenceCountingIoFilter.java:96) 
        at com.jpmorgan.qpid.org.apache.mina.common.support.AbstractIoFilterChain.callNextMessageReceived(AbstractIoFilterChain.java:362) 
        at com.jpmorgan.qpid.org.apache.mina.common.support.AbstractIoFilterChain.access$1200(AbstractIoFilterChain.java:54) 
        at com.jpmorgan.qpid.org.apache.mina.common.support.AbstractIoFilterChain$EntryImpl$1.messageReceived(AbstractIoFilterChain.java:800) 
        at com.jpmorgan.qpid.org.apache.mina.filter.codec.support.SimpleProtocolDecoderOutput.flush(SimpleProtocolDecoderOutput.java:60) 
        at com.jpmorgan.qpid.org.apache.mina.filter.codec.QpidProtocolCodecFilter.messageReceived(QpidProtocolCodecFilter.java:174) 
        at com.jpmorgan.qpid.org.apache.mina.common.support.AbstractIoFilterChain.callNextMessageReceived(AbstractIoFilterChain.java:362) 
        at com.jpmorgan.qpid.org.apache.mina.common.support.AbstractIoFilterChain.access$1200(AbstractIoFilterChain.java:54) 
        at com.jpmorgan.qpid.org.apache.mina.common.support.AbstractIoFilterChain$EntryImpl$1.messageReceived(AbstractIoFilterChain.java:800) 
        at org.apache.qpid.pool.Event$ReceivedEvent.process(Event.java:86) 
        at org.apache.qpid.pool.Job.processAll(Job.java:110) 
        at org.apache.qpid.pool.Job.run(Job.java:149) 
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885) 
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907) 
        at java.lang.Thread.run(Thread.java:619)

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