[jboss-jira] [JBoss JIRA] Created: (JBRULES-2734) NPE loading changeset

[Tommy Odom (JIRA)]

NPE loading changeset
---------------------

                 Key: JBRULES-2734
                 URL: https://jira.jboss.org/browse/JBRULES-2734
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: drools-core  (expert)
    Affects Versions: 5.1.1.FINAL
            Reporter: Tommy Odom
            Assignee: Mark Proctor


We are receiving a NPE when drools is attempting to load the deltas from guvnor in our webapp.  This used to work fine in 5.0 but we recently upgraded to 5.1 and started receiving this error after we create a new snapshot in guvnor.

The output from our application server log is:

KnowledgeAgent applying ChangeSet
KnowledgeAgent performing an incremental build of the ChangeSet

no visitor implementation for : class org.drools.ruleflow.core.RuleFlowProcess : org.drools.ruleflow.core.RuleFlowProcess at 30012e
Exception in thread "Thread-36" 
org.drools.RuntimeDroolsException: java.lang.reflect.InvocationTargetException : [R
ule name=Project Part Custom Finishing Cost, agendaGroup=MAIN, salience=0, no-loop=false]        at org.drools.core.util.ReflectiveVisitor.visit(ReflectiveVisitor.java:56)
        at org.drools.agent.impl.BinaryResourceDiffProducerImpl.diff(BinaryResourceDiffProducerImpl.java:63)
        at org.drools.agent.impl.KnowledgeAgentImpl.incrementalBuildResources(KnowledgeAgentImpl.java:785)        at org.drools.agent.impl.KnowledgeAgentImpl.buildKnowledgeBase(KnowledgeAgentImpl.java:586)
        at org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:185)
        at org.drools.agent.impl.KnowledgeAgentImpl$ChangeSetNotificationDetector.run(KnowledgeAgentImpl.java:1106)        at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)        at org.drools.core.util.ReflectiveVisitor.visit(ReflectiveVisitor.java:47)
        ... 6 more
Caused by: java.lang.NullPointerException        at org.drools.rule.EvalCondition.equals(EvalCondition.java:169)
        at org.drools.rule.GroupElement.equals(GroupElement.java:273)
        at org.drools.agent.impl.BinaryResourceDiffProducerImpl.compareRules(BinaryResourceDiffProducerImpl.java:258)
        at org.drools.agent.impl.BinaryResourceDiffProducerImpl.visitRule(BinaryResourceDiffProducerImpl.java:117)
        ... 11 more

The rule that it mentions in the error is:

dialect "java"
ruleflow-group "finishing-price"
when
  $pp : ProjectPart(finishTime > 0)
  eval(salesChannelId != 4 && includeFinishing)
then
  double finishingRate = 1;
  double customFinishingCost = $pp.getQuantity() * $pp.getFinishTime() * finishingRate;
  addToProjectFinishingCost($pp.getProject(), customFinishingCost);


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