[rules-users] NPE in LeftTupleSetsImpl.removeUpdate

[David Zeigler]

Hi,
I'm using drools 6.0.1.Final.  I received a NPE in the
org.drools.core.common.LeftTupleSetsImpl.removeUpdate() method on line
172, which
corresponds to this line for 6.0.1.Final:
previous.setStagedNext( next );

I see 2 commits in 6.1.0 to address NPEs in this class but I'm not sure if
either of those cover this particular NPE.  I'm unable to reproduce this
issue with my code after the first occurrence.  Does anyone know if this
has been fixed in 6.1.0? Please let me know if I can provide additional
info or if I should open a defect in Jira.

Thanks,
David

Here is the stack trace:
java.lang.NullPointerException
        at
org.drools.core.common.LeftTupleSetsImpl.removeUpdate(
LeftTupleSetsImpl.java:172)
        at
org.drools.core.common.LeftTupleSetsImpl.addDelete(
LeftTupleSetsImpl.java:84)
        at
org.drools.core.common.SynchronizedLeftTupleSets.addDelete(
SynchronizedLeftTupleSets.java:20)
        at
org.drools.core.reteoo.LeftInputAdapterNode.doDeleteSegmentMemory(
LeftInputAdapterNode.java:339)
        at
org.drools.core.reteoo.LeftInputAdapterNode.doDeleteObject(
LeftInputAdapterNode.java:301)
        at
org.drools.core.reteoo.LeftInputAdapterNode.retractLeftTuple(
LeftInputAdapterNode.java:417)
        at
org.drools.core.reteoo.ObjectTypeNode.doRetractObject(
ObjectTypeNode.java:352)
        at
org.drools.core.reteoo.ObjectTypeNode.retractObject(ObjectTypeNode.java:335)
        at
org.drools.core.reteoo.EntryPointNode.retractObject(EntryPointNode.java:395)
        at
org.drools.core.common.NamedEntryPoint.delete(NamedEntryPoint.java:605)
        at
org.drools.core.common.AbstractWorkingMemory.delete(
AbstractWorkingMemory.java:1184)
        at
org.drools.core.common.AbstractWorkingMemory.delete(
AbstractWorkingMemory.java:1176)
        at
org.drools.core.impl.StatefulKnowledgeSessionImpl.delete(
StatefulKnowledgeSessionImpl.java:316)
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