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

[Michael Neale (JIRA)]

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

Michael Neale reassigned JBRULES-506:
-------------------------------------

    Assignee: Edson Tirelli  (was: Mark Proctor)

take a look if you can. Not sure how the fix will translate to trunk now though, but we can at least push the test across to make sure it is also fixed there eventually.

> 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: 3.0.1, 3.0.4
>            Reporter: Leo Liang
>         Assigned To: Edson Tirelli
>         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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