[rules-users] Drools and Jersey

Wed Mar 14 12:53:59 EDT 2012

If you create an isolated test you can also create a new Jira issue, so
it's easier for every one to reproduce, test and fix the problem.
Cheers

2012/3/14 mike <mikemps at gmail.com>

> Wolfgang,
>
> I am using
>
> <dependency>
>  <groupId>org.drools</groupId>
>  <artifactId>drools-core</artifactId>
> <version>5.3.1.Final</version>
>  <type>jar</type>
> </dependency>
>
> Mauricio:
>
> It is something related to loading classes inside Jersey that brakes if I
> am using mvel. I use mvel always, because java syntax hurts me.
>
> Drools Team:
>
> I think the easier way would be to try this scenario yourself. This is a
> pom for Jersey.
>
> <dependency>
> <groupId>com.sun.jersey</groupId>
>  <artifactId>jersey-client</artifactId>
> <version>1.12</version>
>  </dependency>
>
> Thank you very much
> Cheers
> Mike
>
> 2012/3/14 Mauricio Salatino <salaboy at gmail.com>
>
>> Sure.. we are interested in finding out what is happening. So, you find
>> that when you are using mvel something inside Jersey fails?
>> Did you find what exactly is happening inside Jersey? Probably it's
>> something related with the class loaders, but I never seen an error like
>> that when you specify the mvel dialect.
>> By the way, what exactly are you trying to do with mvel? did you try
>> using the mvel syntax without explicitly specifying the dialect?
>>
>> Cheers
>>
>>
>>
>> 2012/3/14 mike <mikemps at gmail.com>
>>
>>> Wait ... I haven't solved the problem ... I mean, as of now I cannot use
>>> mvel if I want to use Jersey ... and I don't think it's Jersey's fault
>>> because it works in any condition except when using mvel. I thought that
>>> the Drools team follows this list and might be interested in that bug.
>>>
>>> Thank you very much
>>> Mike
>>>
>>> 2012/3/14 Mauricio Salatino <salaboy at gmail.com>
>>>
>>>> Cool that you find that :)
>>>> Cheers
>>>>
>>>>
>>>> 2012/3/14 mike <mikemps at gmail.com>
>>>>
>>>>> Hi Mauricio,
>>>>>
>>>>> I spent like 2 days debugging, before realizing that mvel was the
>>>>> culprit. The error is a Null Exception when resolving some service inside
>>>>> Jersey. I have to check my browser history at home for more details but the
>>>>> exception was happening inside Jersey.
>>>>>
>>>>> Please notice I reduced the code to the minimum. I had 'real' code
>>>>> doing more reasonable things with new Client. Client c = new Client() fails
>>>>> too.
>>>>>
>>>>> Thank you very much
>>>>>  Mike
>>>>>
>>>>>
>>>>> 2012/3/14 Mauricio Salatino <salaboy at gmail.com>
>>>>>
>>>>>> Hi Mike, I've never tried that before (a rule without the when
>>>>>> part..) is good to know that it works :)
>>>>>> Humm that's sounds weird.. why the dialect is affecting your Client
>>>>>> creation.
>>>>>> It could be that there is something wrong with the expression
>>>>>> evaluation.
>>>>>> It looks like MVEL cannot compile the new Client(); expression -> at
>>>>>> java.lang.String.<init>(Unknown Source)
>>>>>> Did you try with something like:
>>>>>> then \n
>>>>>> Client c = new Client();
>>>>>>
>>>>>> I'm just guessing here, because it looks strange
>>>>>>
>>>>>>
>>>>>> 2012/3/14 mike <mikemps at gmail.com>
>>>>>>
>>>>>>> Hi Mauricio,
>>>>>>>
>>>>>>> Thank you for the speedy reply. Ia m making rest call to web
>>>>>>> services using jersey. I simplified the rule to the max. The 'when' is not
>>>>>>> really needed. I get the exception on the call to "new Client()". Please
>>>>>>> keep in mind it works without dialect "mvel".
>>>>>>>
>>>>>>> Thank you very much
>>>>>>> Mike
>>>>>>>
>>>>>>> Here's the stack trace .............
>>>>>>> java.lang.StringIndexOutOfBoundsException: String index out of
>>>>>>> range: -1
>>>>>>> at java.lang.String.<init>(Unknown Source)
>>>>>>>  at
>>>>>>> org.mvel2.CompileException.showCodeNearError(CompileException.java:149)
>>>>>>> at
>>>>>>> org.mvel2.CompileException.generateErrorMessage(CompileException.java:219)
>>>>>>>  at org.mvel2.CompileException.toString(CompileException.java:62)
>>>>>>> at java.lang.Throwable.<init>(Throwable.java:242)
>>>>>>>  at java.lang.Exception.<init>(Unknown Source)
>>>>>>> at java.lang.RuntimeException.<init>(Unknown Source)
>>>>>>>  at
>>>>>>> org.drools.runtime.rule.ConsequenceException.<init>(ConsequenceException.java:31)
>>>>>>> at
>>>>>>> org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
>>>>>>>  at
>>>>>>> org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1101)
>>>>>>> at
>>>>>>> org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1029)
>>>>>>>  at
>>>>>>> org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1251)
>>>>>>> at
>>>>>>> org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:709)
>>>>>>>  at
>>>>>>> org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:673)
>>>>>>> at
>>>>>>> org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:218)
>>>>>>>  at
>>>>>>> com.ultimatesoftware.engine.tests.Wip.drools_new_client(Wip.java:32)
>>>>>>> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>>>>>>  at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
>>>>>>> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
>>>>>>>  at java.lang.reflect.Method.invoke(Unknown Source)
>>>>>>> at
>>>>>>> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
>>>>>>>  at
>>>>>>> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
>>>>>>> at
>>>>>>> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
>>>>>>>  at
>>>>>>> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
>>>>>>> at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
>>>>>>>  at
>>>>>>> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:69)
>>>>>>> at
>>>>>>> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:48)
>>>>>>>  at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
>>>>>>> at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
>>>>>>>  at
>>>>>>> org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
>>>>>>> at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
>>>>>>>  at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
>>>>>>> at org.junit.runners.ParentRunner.run(ParentRunner.java:292)
>>>>>>>  at
>>>>>>> org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
>>>>>>> at
>>>>>>> org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
>>>>>>>  at
>>>>>>> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
>>>>>>> at
>>>>>>> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
>>>>>>>  at
>>>>>>> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
>>>>>>> at
>>>>>>> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> 2012/3/14 Mauricio Salatino <salaboy at gmail.com>
>>>>>>>
>>>>>>>> what are you trying to do?
>>>>>>>> what's the error?
>>>>>>>>
>>>>>>>> the rule should look like
>>>>>>>>
>>>>>>>> rule "create Rest Client"
>>>>>>>>     when
>>>>>>>>     then new Client();
>>>>>>>> end
>>>>>>>>
>>>>>>>> 2012/3/14 mike <mikemps at gmail.com>
>>>>>>>>
>>>>>>>>>  Hi there,
>>>>>>>>>
>>>>>>>>> I am trying to make rest calls from Drools. For that I am using
>>>>>>>>> Jersey http://jersey.java.net/. I cannot no get it to work if I
>>>>>>>>> use mvel, otherwise it works fine.
>>>>>>>>>
>>>>>>>>> Here is a sample rule:
>>>>>>>>> ----------------------------------------------------------
>>>>>>>>> import com.sun.jersey.api.client.Client;
>>>>>>>>>
>>>>>>>>> dialect  "mvel"
>>>>>>>>>
>>>>>>>>> rule "create Rest Client"
>>>>>>>>>     then new Client();
>>>>>>>>> end
>>>>>>>>> ----------------------------------------------------------
>>>>>>>>>
>>>>>>>>> I would love to be able to use mvel since it curves java syntax :)
>>>>>>>>>
>>>>>>>>> Thank you
>>>>>>>>> Mike
>>>>>>>>>
>>>>>>>>> _______________________________________________
>>>>>>>>> rules-users mailing list
>>>>>>>>> rules-users at lists.jboss.org
>>>>>>>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>>  - MyJourney @ http://salaboy.wordpress.com
>>>>>>>>  - Co-Founder @ http://www.jugargentina.org
>>>>>>>>  - Co-Founder @ http://www.jbug.com.ar
>>>>>>>>
>>>>>>>>  - Salatino "Salaboy" Mauricio -
>>>>>>>>
>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> rules-users mailing list
>>>>>>>> rules-users at lists.jboss.org
>>>>>>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> rules-users mailing list
>>>>>>> rules-users at lists.jboss.org
>>>>>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>>  - MyJourney @ http://salaboy.wordpress.com
>>>>>>  - Co-Founder @ http://www.jugargentina.org
>>>>>>  - Co-Founder @ http://www.jbug.com.ar
>>>>>>
>>>>>>  - Salatino "Salaboy" Mauricio -
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> rules-users mailing list
>>>>>> rules-users at lists.jboss.org
>>>>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>>>>
>>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> rules-users mailing list
>>>>> rules-users at lists.jboss.org
>>>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>>  - MyJourney @ http://salaboy.wordpress.com
>>>>  - Co-Founder @ http://www.jugargentina.org
>>>>  - Co-Founder @ http://www.jbug.com.ar
>>>>
>>>>  - Salatino "Salaboy" Mauricio -
>>>>
>>>>
>>>> _______________________________________________
>>>> rules-users mailing list
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>>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>>
>>>>
>>>
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>>>
>>
>>
>> --
>>  - MyJourney @ http://salaboy.wordpress.com
>>  - Co-Founder @ http://www.jugargentina.org
>>  - Co-Founder @ http://www.jbug.com.ar
>>
>>  - Salatino "Salaboy" Mauricio -
>>
>>
>> _______________________________________________
>> rules-users mailing list
>> rules-users at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>>
>
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>

-- 
 - MyJourney @ http://salaboy.wordpress.com
 - Co-Founder @ http://www.jugargentina.org
 - Co-Founder @ http://www.jbug.com.ar

 - Salatino "Salaboy" Mauricio -
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