[rules-users] issues with parser when using MVEL dialect

[Edson Tirelli]

   Godmar,

   I copied and pasted your rule and run a simple test using the same
version of jars you mentioned bellow, but I can't reproduce the problem you
are having. If it is still a problem for you, can you zip a sample test
showing the problem and send us?

   Thanks,
     Edson

2008/2/13, Godmar Back <godmar at gmail.com>:
>
> Hi,
>
> I've recently upgraded to Drools 4.0.4 with mvel14-1.2.21.jar, and I'm
> having severe issues with its parser.
> For instance, this simple .drl file:
>
> --
> package test;
>
> rule "Rule #1"
> dialect "mvel"
> when
> then
>     /* a single-line comment */
>     System.out.println("hello world");
> end
> --
>
> results in:
> org.mvel.PropertyAccessException: unable to resolve property: ;
>         at
> org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(
> ReflectiveAccessorOptimizer.java:285)
>         at
> org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor
> (ReflectiveAccessorOptimizer.java:107)
>         at org.mvel.ASTNode.getReducedValueAccelerated(ASTNode.java:185)
>         at org.mvel.MVELRuntime.execute(MVELRuntime.java:88)
>         at org.mvel.CompiledExpression.getValue(CompiledExpression.java
> :107)
>         at org.mvel.MVEL.executeExpression(MVEL.java:223)
>         at org.drools.base.mvel.MVELConsequence.evaluate(
> MVELConsequence.java:47)
>         at org.drools.common.DefaultAgenda.fireActivation(
> DefaultAgenda.java:550)
>         at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java
> :514)
>         at org.drools.common.AbstractWorkingMemory.fireAllRules(
> AbstractWorkingMemory.java:471)
>         at org.drools.common.AbstractWorkingMemory.fireAllRules(
> AbstractWorkingMemory.java:433)
>
> --
> Switching to dialect "java," or removing the /* single-line comment
> */, helps. So does replacing the comment with a // style comment.
> There are many more weirdnesses I'm encountering (I've filed a number
> of bugs already), but I'm wondering if something else isn't amiss
> here.  I also tried mvel16-1.2.22.jar, same effect. On the other hand,
> running just the RHS in mvelsh works just fine.
>
> In this context, I'd like to voice the wish that Drools include a
> command-line driver that can load and execute .drl files for testing.
>
> - Godmar
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>



-- 
  Edson Tirelli
  JBoss Drools Core Development
  Office: +55 11 3529-6000
  Mobile: +55 11 9287-5646
  JBoss, a division of Red Hat @ www.jboss.com
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