[rules-users] Date arithmetic in when part

[lhorton]

I am getting runtime exception with these temporal operator changes when I
compile the knowledge base using a knowledge agent.  If I compile the drl
using:
		KnowledgeBuilder kb = KnowledgeBuilderFactory.newKnowledgeBuilder();
		kb.add(ResourceFactory.newFileResource(path), ResourceType.DRL); // path
is the .drl file
		if (kb.hasErrors()) {
			System.out.println(kb.getErrors().toString());
		}
		KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
		kbase.addKnowledgePackages(kb.getKnowledgePackages());
and create a stateless knowledge session using the kbase, then at runtime I
do not get any errors.

however, if I build the knowledge base using:
		agent = KnowledgeAgentFactory.newKnowledgeAgent(agentName);
		agent.applyChangeSet(ResourceFactory.newClassPathResource(path)); // path
is to change set including only the above .drl file
                return agent.getKnowledgeBase();

the package compiles, but at runtime, the same tests that worked fine for
the KnowledgeBuilder package instead get a NPE:

java.lang.NullPointerException
        at
org.drools.base.evaluators.BeforeEvaluatorDefinition$BeforeEvaluator.evaluateCachedLeft(BeforeEvaluatorDefinition.java:347)
        at
org.drools.rule.VariableRestriction.isAllowedCachedLeft(VariableRestriction.java:115)
        at
org.drools.rule.VariableConstraint.isAllowedCachedLeft(VariableConstraint.java:115)
        at
org.drools.common.SingleBetaConstraints.isAllowedCachedLeft(SingleBetaConstraints.java:127)
        at
org.drools.reteoo.FromNode.checkConstraintsAndPropagate(FromNode.java:269)
        at org.drools.reteoo.FromNode.assertLeftTuple(FromNode.java:133)
        at
org.drools.reteoo.CompositeLeftTupleSinkAdapter.doPropagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:232)
        at
org.drools.reteoo.CompositeLeftTupleSinkAdapter.propagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:91)
        at
org.drools.reteoo.FromNode.checkConstraintsAndPropagate(FromNode.java:274)
        at org.drools.reteoo.FromNode.assertLeftTuple(FromNode.java:133)
        at
org.drools.reteoo.CompositeLeftTupleSinkAdapter.doPropagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:232)
        at
org.drools.reteoo.CompositeLeftTupleSinkAdapter.createAndPropagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:118)
        at
org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:154)
        at
org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59)
        at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:134)
        at
org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59)
        at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:134)
        at
org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59)
        at
org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:193)
        at
org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:191)
        at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:332)
        at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:293)
        at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:905)
        at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:864)
        at
org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:255)
        at
org.drools.impl.StatelessKnowledgeSessionImpl.execute(StatelessKnowledgeSessionImpl.java:303)
        at
com.abclegal.rules.AbstractRulesUnit.executeWorkflow(AbstractRulesUnit.java:215)
        at
com.abclegal.rules.RulesApplyInstructionUnit.testFileAtCourtCheckpointToWithOldDate(RulesApplyInstructionUnit.java:73)


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