[rules-users] uninformative rule parsing/compiling error -> org.drools.rule.Rule cannot be cast to org.drools.rule.Query

[Davide Sottara]

Two clarifications first:

1) Which version are you using?

2) Is TrackerUpdate a static class inside TrackerRemote?
In case, could you post the exact "import" statements you are using?

Thanks
Davide

On 07/24/2013 02:14 PM, De Rooms Brecht wrote:
> Dear rules users,
>
> I am currently writing my own Drools-server since I wanted more
> control than the drools-execution server (and it never worked very
> well here) where I can send rules/facts over JMS/AQMP/STOMP. Rules
> which are sent are saved on the server-side in DRL files that are
> monitored. That way, I can debug easily by changing the sent files.
> However, when I sent the following code, the agent does not provide me
> with an error message at all and hangs:
> /
> //rule "TrackerRemote.TrackerUpdate"//
> //    when//
> //        message:TrackerRemote.TrackerUpdate()//
> //    then//
> //        System.out.println("Tracker: " + message);//
> //end/
>
> at first I thought it was because TrackerRemote.TrackerUpdate is not
> in that package anymore and thus unknown so I tried to send the rule
> listed below which gives me the nice and expected error:
>     Unable to resolve ObjectType 'NotExistingType' : [Rule name='Foo']
>
> /rule "Foo"//
> //    when //
> //        NotExistingType( bloe == "test")//
> //    then//
> //        System.out.println("this should not work");//
> //end/
>
> when I compile the rule myself with a KnowledgeBuilder:
>
> KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
> InputStream is = new ByteArrayInputStream(drlstring.getBytes());
> kbuilder.add(
> ResourceFactory.newInputStreamResource(is),ResourceType.DRL );
>
> I receive the error:
> org.drools.rule.Rule cannot be cast to org.drools.rule.Query
> which I think doesn't tell me anything about the mistake I made in my
> rule, is this a Drools bug and should I post this somewhere?
>
> Kind Regards,
> De Rooms Brecht
>
>
> Full Stack:
> java.lang.ClassCastException: org.drools.rule.Rule cannot be cast to
> org.drools.rule.Query
>     at
> org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:175)
>     at
> org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:118)
>     at
> org.drools.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:67)
>     at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:84)
>     at
> org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:2706)
>     at
> org.drools.compiler.PackageBuilder.compileRules(PackageBuilder.java:930)
>     at
> org.drools.compiler.PackageBuilder.compileAllRules(PackageBuilder.java:839)
>     at
> org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:831)
>     at
> org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:467)
>     at
> org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:673)
>     at
> org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:45)
>     at
> org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:34)
>     at
> derooms.be.server.listeners.RulesListener.processMessage(RulesListener.java:33)
>     at
> derooms.be.server.listeners.AbstractListener.onMessage(AbstractListener.java:35)
>     at
> org.apache.activemq.ActiveMQMessageConsumer.dispatch(ActiveMQMessageConsumer.java:1321)
>     at
> org.apache.activemq.ActiveMQSessionExecutor.dispatch(ActiveMQSessionExecutor.java:131)
>     at
> org.apache.activemq.ActiveMQSessionExecutor.iterate(ActiveMQSessionExecutor.java:202)
>     at
> org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.java:129)
>     at
> org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:47)
>     at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>     at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>     at java.lang.Thread.run(Thread.java:722)
>
>
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