[rules-users] Exception using persistence

[Robert]

Hi, I followed the instructions on setting up the persistence in the  
drools flow doc, but I get the following exception:


Exception in thread "main" java.lang.RuntimeException: Could not commit  
session
	at  
org.drools.persistence.session.SingleSessionCommandService.<init>(SingleSessionCommandService.java:133)
	at  
org.drools.persistence.jpa.impl.JPAKnowledgeServiceProviderImpl.newStatefulKnowledgeSession(JPAKnowledgeServiceProviderImpl.java:44)
	at  
org.drools.persistence.jpa.JPAKnowledgeService.newStatefulKnowledgeSession(JPAKnowledgeService.java:93)
	at  
com.rob.server.core.process.drools.tasks.DroolsProcessHandler.<init>(DroolsProcessHandler.scala:130)
	at  
com.rob.server.core.process.drools.tasks.StartDroolsProcessHandler$.main(DroolsProcessHandler.scala:33)
	at  
com.rob.server.core.process.drools.tasks.StartDroolsProcessHandler.main(DroolsProcessHandler.scala)
Caused by: javax.naming.NameNotFoundException; remaining name  
'UserTransaction'
	at org.eclipse.jetty.jndi.NamingContext.lookup(NamingContext.java:576)
	at org.eclipse.jetty.jndi.NamingContext.lookup(NamingContext.java:663)
	at org.eclipse.jetty.jndi.NamingContext.lookup(NamingContext.java:678)
	at  
org.eclipse.jetty.jndi.java.javaRootURLContext.lookup(javaRootURLContext.java:110)
	at javax.naming.InitialContext.lookup(InitialContext.java:392)
	at  
org.drools.persistence.session.SingleSessionCommandService.<init>(SingleSessionCommandService.java:109)
	... 5 more


I have no idea what this means. I guess SingleSessionCommandService is  
looking up for "UserTransaction", but whats the "UserTransaction" ?

Cheers, Rob.

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