On 10 February 2012 20:08, womuji
<cmregister@gmail.com> wrote:
Hi,
I kept getting NPE for the following MVEL express in Drools rule:
---------------------------------------
rule "my Rule"
ruleflow-group "myGroup"
no-loop true
when
not Field(id=="meetingNotes")
$student : Student()
$homeAddress : Address() from
addressManager.findFirstAddressByTypeByPerson( new ReferenceCode("xyz"),
$student )
then
eventFields.put("meetingNotes",new
Field("meetingNotes",AbstractFieldConverter.formatFullAddress($homeAddress)));
end
---------------------------------------
the stack trace is:
---------------------------------------
[Error: null pointer: addressManager.findFirstAddressByTypeByPerson( new
ReferenceCode("xyz"), $student )]
[Near : {... addressManager.findFirstAddres ....}]
^
[Line: 1, Column: 1]
at
org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:434)
at
org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:141)
at org.mvel2.ast.ASTNode.optimize(ASTNode.java:157)
at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:113)
at org.mvel2.MVELRuntime.execute(MVELRuntime.java:87)
at
org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:122)
at
org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:115)
at org.mvel2.MVEL.executeExpression(MVEL.java:942)
at
org.drools.base.dataproviders.MVELDataProvider.getResults(MVELDataProvider.java:111)
at org.drools.reteoo.FromNode.assertLeftTuple(FromNode.java:140)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:197)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:72)
at org.drools.reteoo.JoinNode.assertObject(JoinNode.java:161)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:458)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:386)
at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:215)
at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:244)
at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:330)
at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:291)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:886)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:845)
at
org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:255)
at
org.drools.command.runtime.rule.InsertObjectCommand.execute(InsertObjectCommand.java:84)
at
org.drools.command.runtime.rule.InsertObjectCommand.execute(InsertObjectCommand.java:38)
at
org.drools.command.runtime.BatchExecutionCommandImpl.execute(BatchExecutionCommandImpl.java:155)
at
org.drools.command.runtime.BatchExecutionCommandImpl.execute(BatchExecutionCommandImpl.java:76)
at
org.drools.impl.StatelessKnowledgeSessionImpl.execute(StatelessKnowledgeSessionImpl.java:264)
---------------------------------------
I'm using Drools5.3.0.Final, which in turn depends on MVEL2.1.0
Anything wrong with my MVEL expression?
Thanks in advance.
--
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