If I set up TRANSACTION_LOCAL as transaction-type (or simply I do not specify JTA), I have this error:

ERROR SingleSessionCommandService - Could not commit session
java.lang.NullPointerException
at org.drools.persistence.jta.JtaTransactionManager.getStatus(JtaTransactionManager.java:197)
at org.drools.persistence.jta.JtaTransactionManager.begin(JtaTransactionManager.java:150)
at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:120)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommanService(KnowledgeStoreServiceImpl.java:116)
at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.newStatefulKnowledgeSession(KnowledgeStoreServiceImpl.java:54)
at org.drools.persistence.jpa.JPAKnowledgeService.newStatefulKnowledgeSession(JPAKnowledgeService.java:122)

(...)