NullPointerException in LHS constraint in BRMS
Issue
- I get NullPointerException while runnintg rules. The error message doesn't give much idea.
[Error: null pointer: trailer.name]
[Near : {... trailer.name == "John" ....}]
^
[Line: 1, Column: 1]
at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:427)
at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:140)
at org.mvel2.ast.ASTNode.optimize(ASTNode.java:159)
at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:115)
at org.mvel2.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:114)
at org.mvel2.compiler.ExecutableAccessor.getValue(ExecutableAccessor.java:42)
at org.mvel2.MVEL.executeExpression(MVEL.java:930)
at org.drools.core.util.MVELSafeHelper$RawMVELEvaluator.executeExpression(MVELSafeHelper.java:481)
at org.drools.core.rule.constraint.MvelConditionEvaluator.evaluate(MvelConditionEvaluator.java:77)
at org.drools.core.rule.constraint.MvelConditionEvaluator.evaluate(MvelConditionEvaluator.java:62)
at org.drools.core.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:217)
at org.drools.core.rule.constraint.MvelConstraint.isAllowed(MvelConstraint.java:174)
at org.drools.core.reteoo.AlphaNode.assertObject(AlphaNode.java:134)
at org.drools.core.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:60)
at org.drools.core.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:288)
at org.drools.core.reteoo.EntryPointNode.assertObject(EntryPointNode.java:260)
at org.drools.core.common.NamedEntryPoint.insert(NamedEntryPoint.java:368)
at org.drools.core.common.NamedEntryPoint.insert(NamedEntryPoint.java:287)
at org.drools.core.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1143)
at org.drools.core.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1087)
at org.drools.core.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:308)
at com.sample.DroolsTest.main(DroolsTest.java:28)
Caused by: java.lang.NullPointerException
at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:393)
... 21 more
Environment
- Red Hat JBoss BRMS
- 6.0.3
Subscriber exclusive content
A Red Hat subscription provides unlimited access to our knowledgebase of over 48,000 articles and solutions.
Welcome! Check out the Getting Started with Red Hat page for quick tours and guides for common tasks.
