[jboss-jira] [JBoss JIRA] (DROOLS-323) Incremental Builds Result in ClassCastExceptions

[David Templin (JIRA)]

     [ https://issues.jboss.org/browse/DROOLS-323?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Templin updated DROOLS-323:
---------------------------------

    Attachment: drools-bug.tar.gz

    
> Incremental Builds Result in ClassCastExceptions
> ------------------------------------------------
>
>                 Key: DROOLS-323
>                 URL: https://issues.jboss.org/browse/DROOLS-323
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>    Affects Versions: 5.5.0.Final
>            Reporter: David Templin
>            Assignee: Mark Proctor
>         Attachments: drools-bug.tar.gz
>
>
> Incremental builds via the {{KnowledgeAgent}} occasionally result in a {{ClassCastException}}, such as the following:
> {noformat}
> java.lang.ClassCastException: org.drools.reteoo.AlphaNode$AlphaMemory cannot be cast to org.drools.reteoo.BetaMemory
> 	at org.drools.reteoo.JoinNode.updateSink(JoinNode.java:398)
> 	at org.drools.reteoo.RuleTerminalNode.attach(RuleTerminalNode.java:346)
> 	at org.drools.reteoo.builder.ReteooRuleBuilder.addSubRule(ReteooRuleBuilder.java:174)
> 	at org.drools.reteoo.builder.ReteooRuleBuilder.addRule(ReteooRuleBuilder.java:134)
> 	at org.drools.reteoo.ReteooBuilder.addRule(ReteooBuilder.java:113)
> 	at org.drools.reteoo.ReteooRuleBase.addRule(ReteooRuleBase.java:445)
> 	at org.drools.common.AbstractRuleBase.addRule(AbstractRuleBase.java:952)
> 	at org.drools.common.AbstractRuleBase.addPackages(AbstractRuleBase.java:629)
> 	at org.drools.reteoo.ReteooRuleBase.addPackages(ReteooRuleBase.java:472)
> 	at org.drools.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:149)
> 	at org.drools.agent.impl.KnowledgeAgentImpl.addResourcesToKnowledgeBase(KnowledgeAgentImpl.java:1117)
> 	at org.drools.agent.impl.KnowledgeAgentImpl.incrementalBuildResources(KnowledgeAgentImpl.java:1003)
> 	at org.drools.agent.impl.KnowledgeAgentImpl.buildKnowledgeBase(KnowledgeAgentImpl.java:686)
> 	at org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:207)
> 	at org.drools.agent.impl.KnowledgeAgentImpl$ChangeSetNotificationDetector.run_aroundBody0(KnowledgeAgentImpl.java:1301)
> 	at org.drools.agent.impl.KnowledgeAgentImpl$ChangeSetNotificationDetector$AjcClosure1.run(KnowledgeAgentImpl.java:1)
> 	at com.foo.DroolsBugAspect.ajc$around$com_foo_DroolsBugAspect$1$b7e32854proceed(DroolsBugAspect.aj:8)
> 	at com.foo.DroolsBugAspect.ajc$around$com_foo_DroolsBugAspect$1$b7e32854(DroolsBugAspect.aj:10)
> 	at org.drools.agent.impl.KnowledgeAgentImpl$ChangeSetNotificationDetector.run(KnowledgeAgentImpl.java:1295)
> 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
> 	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> 	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
> 	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> 	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
> 	at java.lang.Thread.run(Thread.java:695)
> {noformat}
> Steps to reproduce:
> # Download the attached zip file ({{drools-bug.zip}})
> # Unzip the contents into a directory
> # {{cd <directory>}}
> # {{mvn install}}
> # Unix/Linux users: type {{sh target/classes/run.sh}}, or else type {{java -classpath target/classes:target/lib/* -javaagent:target/lib/aspectjweaver-1.7.3.jar com.foo.Main}}
> # Wait for the following sequence of log messages to begin to print to the console:
>   {noformat}
> [2013-11-06 11:05:33,742:debug] ResourceChangeScanner attempt to scan 1 resources
> [2013-11-06 11:05:33,743:debug] ResourceChangeScanner thread is waiting for 2 seconds.
> {noformat}
> # Edit {{target/classes/recommendations.drl}} in some trivial manner; for instance, I have found that editing the RHS of rule "Initialize Recommendations" by adding a print statement {{e.g. System.out.println("test");}} and editing the print statement a few times will reliably reproduce the problem; occasionally, merely touching the file will cause the problem to manifest.
> # Wait for the exception to print to the console; it will look like the exception above
> Note that the exception is suppressed by the executor architecture in Drools. Thus, I had to weave an aspect that catches the exception and prints it.
> This bug also results in a memory leak, since the {{ResourceChangeNotifier}} continues to produce {{ChangeSet}} objects, but there are no consumers after the {{ChangeSetNotificationDetector}} thread terminates, resulting in an unbounded queue.

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