[jboss-jira] [JBoss JIRA] (DROOLS-1135) NullPointerExceptions when using multiple concurrent KieSessions

[Mario Fusco (JIRA)]

Mario Fusco created DROOLS-1135:
-----------------------------------

             Summary: NullPointerExceptions when using multiple concurrent KieSessions
                 Key: DROOLS-1135
                 URL: https://issues.jboss.org/browse/DROOLS-1135
             Project: Drools
          Issue Type: Bug
          Components: core engine
            Reporter: Mario Fusco
            Assignee: Mario Fusco


A number of worker threads is running simultaneously in a thread pool. Each thread is initialised with the same KieContainer from which they extract a KieBase using KieContainer.getKieBase("name"). Each worker thread obtains a KieSession from its KieBase, and then executes a simple loop, taking instructions from a queue, inserting and removing facts based on those instructions, and then firing all rules:

{code}
kieSession = kieBase.newKieSession();
try {
  while (true) {
    work = getItemsFromQueue();
    addAndRemoveFacts(kieSession, work);
    kieSession.fireAllRules();
  }
} finally {
  kieSession.dispose();
}
{code}

This causes the following exceptions:

{code}
Exception in thread "Worker-1" java.lang.NullPointerException	at org.drools.core.reteoo.NodeTypeEnums.isLeftTupleSource(NodeTypeEnums.java:84)
	at org.drools.core.phreak.SegmentUtilities.updateRiaAndTerminalMemory(SegmentUtilities.java:380)
	at org.drools.core.phreak.SegmentUtilities.createSegmentMemory(SegmentUtilities.java:171)
	at org.drools.core.phreak.SegmentUtilities.getQuerySegmentMemory(SegmentUtilities.java:205)
	at org.drools.core.phreak.SegmentUtilities.processQueryNode(SegmentUtilities.java:192)
	at org.drools.core.phreak.SegmentUtilities.createSegmentMemory(SegmentUtilities.java:115)
	at org.drools.core.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:166)
	at org.drools.core.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:63)
	at org.drools.core.reteoo.ObjectTypeNode.propagateAssert(ObjectTypeNode.java:300)
	at org.drools.core.phreak.PropagationEntry$Insert.execute(PropagationEntry.java:93)
	at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:78)
	at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:73)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.flushPropagations(StatefulKnowledgeSessionImpl.java:2017)
	at org.drools.core.common.DefaultAgenda.fireLoop(DefaultAgenda.java:1334)
	at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1288)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.internalFireAllRules(StatefulKnowledgeSessionImpl.java:1306)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1297)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1278)
	at com.X.processRequests(X.java:86)
	at com.X$$Lambda$104/975722152.run(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
{code}

{code}
Exception in thread "Worker-6" java.lang.NullPointerException	at org.drools.core.reteoo.ObjectTypeNode.updateTupleSinkId(ObjectTypeNode.java:410)
	at org.drools.core.reteoo.ObjectTypeNode.updateTupleSinkId(ObjectTypeNode.java:416)
	at org.drools.core.reteoo.ObjectTypeNode.updateTupleSinkId(ObjectTypeNode.java:416)
	at org.drools.core.reteoo.ObjectTypeNode.checkDirty(ObjectTypeNode.java:274)
	at org.drools.core.reteoo.ObjectTypeNode.propagateAssert(ObjectTypeNode.java:294)
	at org.drools.core.phreak.PropagationEntry$Insert.execute(PropagationEntry.java:93)
	at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:78)
	at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:73)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.flushPropagations(StatefulKnowledgeSessionImpl.java:2017)
	at org.drools.core.common.DefaultAgenda.fireLoop(DefaultAgenda.java:1334)
	at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1288)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.internalFireAllRules(StatefulKnowledgeSessionImpl.java:1306)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1297)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1278)
	at com.X.processRequests(X.java:86)
	at com.X$$Lambda$162/1410998625.run(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
{code}

{code}
Exception in thread "Worker-7" java.lang.NullPointerException	at org.drools.core.reteoo.ObjectTypeNode.updateTupleSinkId(ObjectTypeNode.java:410)
	at org.drools.core.reteoo.ObjectTypeNode.checkDirty(ObjectTypeNode.java:274)
	at org.drools.core.reteoo.ObjectTypeNode.propagateAssert(ObjectTypeNode.java:294)
	at org.drools.core.phreak.PropagationEntry$Insert.execute(PropagationEntry.java:93)
	at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:78)
	at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:73)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.flushPropagations(StatefulKnowledgeSessionImpl.java:2017)
	at org.drools.core.common.DefaultAgenda.fireLoop(DefaultAgenda.java:1334)
	at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1288)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.internalFireAllRules(StatefulKnowledgeSessionImpl.java:1306)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1297)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1278)
	at com.X.processRequests(X.java:86)
	at com.X$$Lambda$99/1591140286.run(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
{code}



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