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

[De Rooms Brecht]

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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>
>
>
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