[rules-users] NullPointerException in SessionConfiguration

[Jared Davis]

Any advice on this NPE?  (March 20th snapshot of 5.00)

It occurs when a second thread attempts to create a session using a static
KnowledgeBase.

java.lang.NullPointerException
at org.drools.SessionConfiguration.initProcessInstanceManagerFactory
(SessionConfiguration.java:260)
at org.drools.SessionConfiguration.getProcessInstanceManagerFactory
(SessionConfiguration.java:249)
at org.drools.common.AbstractWorkingMemory.<init>(AbstractWorkingMemory.java:295)
at org.drools.common.AbstractWorkingMemory.<init>(AbstractWorkingMemory.java:239)
at org.drools.reteoo.ReteooWorkingMemory.<init>(ReteooWorkingMemory.java:85)
at org.drools.reteoo.ReteooStatefulSession.<init>(ReteooStatefulSession.java:67)
at org.drools.reteoo.ReteooRuleBase.newStatefulSession(ReteooRuleBase.java:325)
at org.drools.reteoo.ReteooRuleBase.newStatefulSession(ReteooRuleBase.java:310)
at org.drools.impl.KnowledgeBaseImpl.newStatefulKnowledgeSession
(KnowledgeBaseImpl.java:151)
at org.drools.impl.KnowledgeBaseImpl.newStatefulKnowledgeSession
(KnowledgeBaseImpl.java:134)