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

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...]