Description of problem:

There is a deadlock condition in the Qpid JCA adapter. For inbound messaging, endpoint activation is handled by the QpidActivation.SetupActivation class. This class is a Work instance and is submitted to the JCA WorkManager, as such it is run in a separate thread. 

In the case where the initial activation call blocks (invalid durable subscription names), the IOReceiver thread receives an exception prior to the QpidActivation class every being property initialized. On an exception we attempt to teardown and setup the activation again. However, at this point the QpidActivation instance is locked by the JCA Work manager, as such, the IOReceiver thread (or any other that received the exception first), can't make forward progress because the QpidActivation class has been locked. Both the setup() and teardown() methods are synchronized and prohibit  forward progress since the JCA Work Manager already has a lock on the instance.

How reproducible:
Immediate

Steps to Reproduce:
1. Deploy the Qpid JCA adapter
2. Create a Topic Destination via *-ds.xml file.
3. Deploy an MDB, using a durable subscription with a name that does not exist.
  
Actual results:
JBoss EAP locks up and as such, does not allow a graceful shutdown without resorting to kill - <pid> or other extraordinary measures. Run jstack <pid> to review the deadlock condition.


The QpidActivation class contains a a SetupActivation class that is only responsible for setting up the initial connection/session etc. It shares the same code with the QpidActivation as a whole most notably the onException(), handleFailure() code. If the initial setup fails, or blocks, other threads receive the onException() invocation and attempt to teardown() and setup() the activation again. Since the instance is blocked, a deadlock occurs.