[jboss-jira] [JBoss JIRA] Updated: (JBRULES-506) Exception thrown when retract, reassert and retract again

[Leo Liang (JIRA)]

     [ http://jira.jboss.com/jira/browse/JBRULES-506?page=all ]

Leo Liang updated JBRULES-506:
------------------------------

    Attachment: Fact.java
                test.drl

> Exception thrown when retract, reassert and retract again
> ---------------------------------------------------------
>
>                 Key: JBRULES-506
>                 URL: http://jira.jboss.com/jira/browse/JBRULES-506
>             Project: JBoss Rules
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>    Affects Versions: 3.0.4, 3.0.1
>            Reporter: Leo Liang
>         Assigned To: Mark Proctor
>         Attachments: Fact.java, test.drl, TestDriver.java
>
>
> In one rule retract the object and re-assert it, then retract the object again in the following activated rule. A null pointer exception will occur at this time.
> java.lang.NullPointerException
> 	at org.drools.reteoo.TerminalNode.retractTuple(TerminalNode.java:216)
> 	at org.drools.reteoo.LeftInputAdapterNode.retractObject(LeftInputAdapterNode.java:207)
> 	at org.drools.reteoo.ObjectSource.propagateRetractObject(ObjectSource.java:141)
> 	at org.drools.reteoo.ObjectTypeNode.retractObject(ObjectTypeNode.java:180)
> 	at org.drools.reteoo.Rete.retractObject(Rete.java:150)
> 	at org.drools.reteoo.ReteooRuleBase.retractObject(ReteooRuleBase.java:207)
> 	at org.drools.reteoo.ReteooWorkingMemory.doRetract(ReteooWorkingMemory.java:77)
> 	at org.drools.common.AbstractWorkingMemory.retractObject(AbstractWorkingMemory.java:668)
> 	at org.drools.base.DefaultKnowledgeHelper.retractObject(DefaultKnowledgeHelper.java:86)
> 	at com.ericsson.ruletest.debug.Rule_test2_0.consequence(Rule_test2_0.java:8)
> 	at com.ericsson.ruletest.debug.Rule_test2_0ConsequenceInvoker.evaluate(Rule_test2_0ConsequenceInvoker.java:22)
> 	at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:437)
> 	at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:407)
> 	at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:269)
> 	at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:256)
> 	at com.ericsson.ruletest.TestDriver.main(TestDriver.java:26)
> The given test case is the the simplified from my production code.
> --------------- test.drl ------------------------
> package com.ericsson.ruletest.debug
> import com.ericsson.ruletest.Fact;
> rule "test1"
> 	salience 10
> 	no-loop true
>     when
>         input:Fact();
>     then
>     	retract(input);
> 	assert(input);
> end;
> rule "test2"
> 	salience 0
> 	no-loop true
>     when
>         input:Fact();
>     then
> 	retract(input);
> end;

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