[rules-users] Drools and Jersey

Wed Mar 14 12:14:59 EDT 2012

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 -
>>>>
>>>>
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>>>>
>>>>
>>>
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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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>>
>
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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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