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

[De Rooms Brecht]

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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