[rules-users] Drools and Jersey
mike
mikemps at gmail.com
Wed Mar 14 12:12:04 EDT 2012
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
>>>
>>>
>>
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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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> https://lists.jboss.org/mailman/listinfo/rules-users
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