HarvestJobManager produces duplicate jobs

20:04:10.560 INFO  d.n.h.datamodel.HeritrixTemplate - Inserting 1 crawlertraps for domain 'jugendvertretung.at' into the template
20:04:10.560 INFO  d.n.h.datamodel.H3HeritrixTemplate - Inserting 1 crawlertraps into the template
20:04:10.560 WARN  d.n.h.datamodel.HeritrixTemplate - Found empty trap for domain
20:04:10.561 WARN  d.n.h.datamodel.HeritrixTemplate - Found empty trap for domain
20:04:10.561 WARN  d.n.h.datamodel.HeritrixTemplate - Found empty trap for domain
20:04:10.561 WARN  d.n.h.datamodel.HeritrixTemplate - Found empty trap for domain
20:04:10.562 WARN  d.n.h.datamodel.HeritrixTemplate - Found empty trap for domain
20:04:10.562 WARN  d.n.h.datamodel.HeritrixTemplate - Found empty trap for domain
20:04:10.562 WARN  d.n.h.datamodel.HeritrixTemplate - Found empty trap for domain
20:04:10.562 WARN  d.n.h.datamodel.HeritrixTemplate - Found empty trap for domain
20:04:10.563 WARN  d.n.h.datamodel.HeritrixTemplate - Found empty trap for domain
20:04:10.563 WARN  d.n.h.datamodel.HeritrixTemplate - Found empty trap for domain
20:04:10.563 WARN  d.n.h.datamodel.HeritrixTemplate - Found empty trap for domain
20:04:10.563 WARN  d.n.h.datamodel.HeritrixTemplate - Found empty trap for domain
20:04:10.564 WARN  d.n.h.datamodel.HeritrixTemplate - Found empty trap for domain
20:04:10.564 WARN  d.n.h.datamodel.HeritrixTemplate - Found empty trap for domain
20:09:56.376 WARN  c.m.v.a.ThreadPoolAsynchronousRunner - com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@211fe5a0 -- APPARENT DEADLOCK!!! Creating emergency threads for unassigned pending tasks!
20:22:48.342 WARN  c.m.v.a.ThreadPoolAsynchronousRunner - com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@211fe5a0 -- APPARENT DEADLOCK!!! Complete Status: 
	Managed Threads: 3
	Active Threads: 3
	Active Tasks: 
		com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@43280a8
			on thread: C3P0PooledConnectionPoolManager[identityToken->1bqopiq9r1bcn63ri3oags|197d671]-HelperThread-#0
		com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@2860d2b8
			on thread: C3P0PooledConnectionPoolManager[identityToken->1bqopiq9r1bcn63ri3oags|197d671]-HelperThread-#2
		com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@62d551cd
			on thread: C3P0PooledConnectionPoolManager[identityToken->1bqopiq9r1bcn63ri3oags|197d671]-HelperThread-#1
	Pending Tasks: 
		com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@10db0d58
		com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@7cf82b
		com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@2ea70f8e
		com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@66b478ae
Pool thread stack traces:
	Thread[C3P0PooledConnectionPoolManager[identityToken->1bqopiq9r1bcn63ri3oags|197d671]-HelperThread-#0,5,main]
		com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:672)
	Thread[C3P0PooledConnectionPoolManager[identityToken->1bqopiq9r1bcn63ri3oags|197d671]-HelperThread-#2,5,main]
		com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:672)
	Thread[C3P0PooledConnectionPoolManager[identityToken->1bqopiq9r1bcn63ri3oags|197d671]-HelperThread-#1,5,main]
		com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:672)