[rules-users] No ClassLoaders found for: String

Paul Sentosa psentosa at yahoo.com
Tue Jan 13 11:32:09 EST 2009 

Yes, it works with 2.0.6. Otherwise I should define the String separately (String abc = "a string"; list.add(abc); in order for the consequence to be executed correctly)

Thanks Edson!
Regards
Paul




________________________________
From: Edson Tirelli <tirelli at post.com>
To: Rules Users List <rules-users at lists.jboss.org>
Sent: Tuesday, January 13, 2009 5:03:32 PM
Subject: Re: [rules-users] No ClassLoaders found for: String


   Yes, I see. Can you please manually update your local mvel jar to version 2.0.6 (latest) and try again? I am talking to the MVEL author to make sure the problem is fixed in the latest version, but of course, if you can confirm this on your side, it would be best.

   []s
   Edson


2009/1/13 psentosa <psentosa at yahoo.com>


I'm using maven to manage my libraries, thus I add these line in my pom.xml:
               <dependency>
                       <groupId>org.drools</groupId>
                       <artifactId>drools-api</artifactId>
                       <version>5.0.0.M4</version>
               </dependency>
               <dependency>
                       <groupId>org.drools</groupId>
                       <artifactId>drools-core</artifactId>
                       <version>5.0.0.M4</version>
               </dependency>

And I can see that mvel2-2.0.4 has been added, besides drools-api and core
5.0.0.M4
Thanks for the reply




Edson Tirelli-3 wrote:
>
>     What MVEL version are you using?
>
>     []s
>     Edson
>
> 2009/1/13 psentosa <psentosa at yahoo.com>
>
>>
>> Hallo,
>>
>> I have a rule like this, defined in Guvnor:
>> when
>>     Activity ( $date : date, workingTime > 240)
>>
>> then
>>    System.out.println("Working time limit has been reached");
>>    violatedRegulation.add(new String("regulation.general.working1"));
>>
>>
>> violatedRegulation is a List<String> which I set as a global because
>> later
>> on I will extract the content of that list which is a key defined in a
>> properties file
>>
>> ksession.setGlobal("violatedRegulation", violatedRegulation);
>> ksession.executeObject(activity);
>>
>>
>> but then I got the following exception:
>> 15:52:59,687 INFO  [STDOUT] Working time limit has been reached
>> 15:52:59,687 ERROR [MyExceptionInterceptor] [Error: could not create
>> constructor: No ClassLoaders found for: String ]
>> [Near : {... Unknown ....}]
>>             ^
>> org.drools.runtime.rule.ConsequenceException: [Error: could not create
>> constructor: No ClassLoaders found for: String ]
>> [Near : {... Unknown ....}]
>>             ^
>>        at
>>
>> org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:23)
>>        at
>> org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:918)
>>        at
>> org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:871)
>>        at
>> org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1035)
>>        at
>>
>> org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:612)
>>        at
>>
>> org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:589)
>>        at
>>
>> org.drools.impl.StatelessKnowledgeSessionImpl.executeObject(StatelessKnowledgeSessionImpl.java:158)
>> ..................
>>
>> Caused by: [Error: could not create constructor: No ClassLoaders found
>> for:
>> String ]
>> [Near : {... Unknown ....}]
>>             ^
>>        at
>>
>> org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeObjectCreation(ReflectiveAccessorOptimizer.java:805)
>>        at
>>
>> org.mvel2.optimizers.dynamic.DynamicOptimizer.optimizeObjectCreation(DynamicOptimizer.java:80)
>>        at
>>
>> org.mvel2.ast.NewObjectNode.getReducedValueAccelerated(NewObjectNode.java:148)
>>        at
>> org.mvel2.compiler.ExecutableAccessor.getValue(ExecutableAccessor.java:37)
>>        at
>>
>> org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:590)
>>        at
>>
>> org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:285)
>>        at
>>
>> org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:134)
>>        at
>>
>> org.mvel2.optimizers.dynamic.DynamicOptimizer.optimizeAccessor(DynamicOptimizer.java:61)
>>        at
>> org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:127)
>>        at org.mvel2.MVELRuntime.execute(MVELRuntime.java:91)
>>        at
>> org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:101)
>>        at org.mvel2.MVEL.executeExpression(MVEL.java:1025)
>>        at
>> org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:89)
>>        at
>> org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:909)
>>        ... 97 more
>> Caused by: java.lang.ClassNotFoundException: No ClassLoaders found for:
>> String
>>        at org.jboss.mx.loading.LoadMgr3.beginLoadTask(LoadMgr3.java:306)
>>        at
>>
>> org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:521)
>>        at
>>
>> org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:415)
>>        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
>>        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
>>        at java.lang.Class.forName0(Native Method)
>>        at java.lang.Class.forName(Class.java:164)
>>        at org.mvel2.util.ParseTools.createClass(ParseTools.java:458)
>>        at org.mvel2.util.ParseTools.findClass(ParseTools.java:796)
>>        at
>>
>> org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileConstructor(ReflectiveAccessorOptimizer.java:832)
>>        at
>>
>> org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeObjectCreation(ReflectiveAccessorOptimizer.java:799)
>>        ... 110 more
>>
>> Any help would be very appreciated
>>
>> ps: the very same rule worked with drools 4.0.7
>>
>> Regards
>>
>>
>>
>>
>> --
>> View this message in context:
>> http://www.nabble.com/No-ClassLoaders-found-for%3A-String-tp21437370p21437370.html
>> Sent from the drools - user mailing list archive at Nabble.com.
>>
>> _______________________________________________
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>> rules-users at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>
>
>
> --
>  Edson Tirelli
>  JBoss Drools Core Development
>  JBoss, a division of Red Hat @ www.jboss.com
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>

--
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-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss, a division of Red Hat @ www.jboss.com



      
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