ActiveMQActivationSpec default maxSessions value reset to 0 by Geronimo
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         Key: GERONIMO-688
         URL: http://issues.apache.org/jira/browse/GERONIMO-688
     Project: Geronimo
        Type: Bug
    Versions: 1.0-M4    
    Reporter: Ivan Dubrov


The org.activemq.ra.ActiveMQActivationSpec  sets its maxSessions property to 
the 10 by default, but during application deployment if maxSessions is not set 
manually, Geronimo GBeans runtime resets this value to the 0, making MDB beans 
not working.

Here is the exception thrown during sending message to the topic:

13:24:04,749 WARN  [TransportChannelSupport] No Packet found to match Receipt 
correlationId: 9
java.util.NoSuchElementException
        at java.util.LinkedList.remove(LinkedList.java:579)
        at java.util.LinkedList.removeFirst(LinkedList.java:131)
        at 
org.activemq.ra.ServerSessionPoolImpl.getExistingServerSession(ServerSessionPoolImpl.java
:116)
        at 
org.activemq.ra.ServerSessionPoolImpl.getServerSession(ServerSessionPoolImpl.java:98)
        at 
org.activemq.ActiveMQConnectionConsumer.dispatchToSession(ActiveMQConnectionConsumer.java
:154)
        at 
org.activemq.ActiveMQConnectionConsumer.dispatch(ActiveMQConnectionConsumer.java:116)
        at org.activemq.ActiveMQConnection.consume(ActiveMQConnection.java:937)
        at 
org.activemq.transport.TransportChannelSupport.doConsumePacket(TransportChannelSupport.ja
va:374)
        at 
org.activemq.transport.TransportChannelSupport.doConsumePacket(TransportChannelSupport.ja
va:368)
        at 
org.activemq.transport.tcp.TcpTransportChannel.run(TcpTransportChannel.java:310)
        at java.lang.Thread.run(Thread.java:534)

The reason is that maxSessions = 0, and sessions list size = 0 too, so it tries 
to get existent session (as maximum size is reached) from the empty list.

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