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

[Davide Sottara]

I could not reproduce the issue..
could you submit a self-contained, obfuscated test case (DRL + classes)?
I suspect you are leaving out some detail which is the real cause of the
error
Thanks
Davide

p.s. I used this mock class:

package vrpn;

public class TrackerRemote {

    public TrackerUpdate getUpdate() {

        return new TrackerUpdate();

    }

    public class TrackerUpdate {

    }

}


and your rule, removing the "message" from the RHS



On 07/30/2013 01:51 AM, De Rooms Brecht wrote:
> Op 24/07/2013 14:24, Davide Sottara schreef:
>> Two clarifications first:
>>
>> 1) Which version are you using?
> I am using version 5.5
>> 2) Is TrackerUpdate a static class inside TrackerRemote?
>> In case, could you post the exact "import" statements you are using?
>>
> the TrackerUpdate is not static, but it's a class defined within the
> TrackerUpdate class.
> /public class TrackerRemote
> ....
>  public class TrackerUpdate {
>         public java.util.Date msg_time;
>         public int sensor;
>         public double[] pos;
>         public double[] quat;
>
>         public TrackerUpdate() { /* compiled code */ }
>     }/
>
> The full imports and rule is:
> package derooms.be.testRule
> import derooms.be.server.predefinedtypes.Event;
> import derooms.be.test.Message;
> import vrpn.TrackerRemote;
> /
> rule "TrackerRemote.TrackerUpdate"
>     when
>         message:TrackerRemote.TrackerUpdate()
>     then
>         System.out.println("Tracker: " + message);
> end/
>
> Sorry that I didn't sent it earlier, I actually sent this e-mail
> already but it didn't came through.
>
> B
>
>> 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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>>> rules-users mailing list
>>> rules-users at lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>>
>>
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