Occasionally, after a JBoss server restart we get the following exception when we send 
a new message:
  java.sql.SQLException: ORA-00001: unique constraint (JMS_MESSAGES_PK) violated

An investigation of the JBoss source code indicates that the messageIdCounter
is reset to 0 on JMS server restart.  See the following JBoss files in the messaging
component:
  JMSTopic.java
  JMSDestination.java

If there are any persistent unprocessed messages in the queue when the server is 
brought down, there is the possibily of a messageid collision when the server is 
started.  Perhaps the messageIdCounter should be initialized to "select max(messageid) 
from JMS_MESSAGES"?


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