[jboss-jira] [JBoss JIRA] (DROOLS-1742) NPE in RuleNEtworkEvaluator after incremental compilation

[Théophane Charbonnier (JIRA)]

Théophane Charbonnier created DROOLS-1742:
---------------------------------------------

             Summary: NPE in RuleNEtworkEvaluator after incremental compilation
                 Key: DROOLS-1742
                 URL: https://issues.jboss.org/browse/DROOLS-1742
             Project: Drools
          Issue Type: Bug
          Components: core engine
    Affects Versions: 7.3.0.Final
            Reporter: Théophane Charbonnier
            Assignee: Mario Fusco
         Attachments: drools-path-memory-reproducer.zip

Having the following drl files :

{code:drl}
package org.hightea.a
import org.drools.compiler.Message
import org.drools.compiler.FirstClass

rule "RG_1"
when
	$event : Message()
	FirstClass(item1 == $event.message1)
then
	System.out.println("RG_1");
end
{code}

and

{code:drl}
package org.hightea.b

import org.drools.compiler.Message
import org.drools.compiler.SecondClass

rule "RG_2"
when
	$event: Message()
	SecondClass(item1 == $event.message1)
then
   System.out.println("RG_2");
end
{code}

We create a module containing the two packages in two drl files and insert a `SecondClass` fact in the WM.
Then we want to incrementally update to a new module containing only the second DRL.
At first fireAllrules after update, we encounter a NPE in RuleNetwork evaluator (a Segment memory is not defined in the path memory)

{code:java}
java.lang.NullPointerException
	at org.drools.core.phreak.RuleNetworkEvaluator.evaluateNetwork(RuleNetworkEvaluator.java:114)
	at org.drools.core.phreak.RuleExecutor.reEvaluateNetwork(RuleExecutor.java:212)
	at org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:87)
	at org.drools.core.concurrent.AbstractRuleEvaluator.internalEvaluateAndFire(AbstractRuleEvaluator.java:34)
	at org.drools.core.concurrent.SequentialRuleEvaluator.evaluateAndFire(SequentialRuleEvaluator.java:43)
	at org.drools.core.common.DefaultAgenda.fireLoop(DefaultAgenda.java:1067)
	at org.drools.core.common.DefaultAgenda.internalFireAllRules(DefaultAgenda.java:1014)
	at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1006)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.internalFireAllRules(StatefulKnowledgeSessionImpl.java:1320)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1311)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1295)
	at org.hightea.IncrementalRemoveRuleTest.testNpeInRuleNetworkEvaluator(IncrementalRemoveRuleTest.java:66)
{code}

Note that we don't encounter this issue when the packages names are the same, or if we exchange the order of drl file name in the first module.

A reproducer is attached with its source code at [https://github.com/hightea/drools-reproducer/tree/path-memory-issue|https://github.com/hightea/drools-reproducer/tree/path-memory-issue]




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