Found one Java-level deadlock:
=============================
"pool-4-thread-2":
  waiting for ownable synchronizer 0x00000007b0bb32c8, (a java.util.concurrent.locks.ReentrantLock$NonfairSync),
  which is held by "pool-4-thread-1"
"pool-4-thread-1":
  waiting to lock monitor 0x00007f9598b1e9f8 (object 0x00000007af6ffad0, a org.drools.persistence.SingleSessionCommandService),
  which is held by "pool-4-thread-2"

Java stack information for the threads listed above:
===================================================
"pool-4-thread-2":
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000007b0bb32c8> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:867)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1197)
	at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:214)
	at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:290)
	at org.drools.persistence.jta.TransactionLockInterceptor.execute(TransactionLockInterceptor.java:81)
	at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:377)
	- locked <0x00000007af6ffad0> (a org.drools.persistence.SingleSessionCommandService)
	at org.drools.core.command.impl.CommandBasedStatefulKnowledgeSession.getProcessInstance(CommandBasedStatefulKnowledgeSession.java:120)
	at com.sample.ProcessJPATest$1.run(ProcessJPATest.java:124)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
"pool-4-thread-1":
	at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:377)
	- waiting to lock <0x00000007af6ffad0> (a org.drools.persistence.SingleSessionCommandService)
	at org.drools.core.command.impl.CommandBasedStatefulKnowledgeSession.getProcessInstance(CommandBasedStatefulKnowledgeSession.java:120)
	at com.sample.ProcessJPATest$1.run(ProcessJPATest.java:130)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)

Found 1 deadlock.