[jboss-jira] [JBoss JIRA] Created: (JBRULES-1461) comment leads to org.mvel.PropertyAccessException

[Godmar Back (JIRA)]

comment leads to org.mvel.PropertyAccessException
-------------------------------------------------

                 Key: JBRULES-1461
                 URL: http://jira.jboss.com/jira/browse/JBRULES-1461
             Project: JBoss Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
    Affects Versions: 4.0.4
            Reporter: Godmar Back


I'm still fighting with Drools's parser.

This code:
package test;

import java.util.ArrayList;
import java.util.HashMap;

dialect "mvel"

rule "Rule #1"
when
then
    /* a comment */
    System.out.println("hello world");
end

produces:

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)
        at org.libx.autodetect.DroolsDriver$Host.fireAllRules(DroolsDriver.java:63)
        at org.libx.autodetect.DroolsDriver.main(DroolsDriver.java:135)
Caused by: org.mvel.PropertyAccessException: unable to resolve property: ;
        at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.getBeanProperty(ReflectiveAccessorOptimizer.java:373)
        at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:254)
        ... 12 more

but this works:
package test;

import java.util.ArrayList;
import java.util.HashMap;

dialect "mvel"

rule "Rule #1"
when
then
    // a single-line comment
    System.out.println("hello world");
end

It makes it *very* difficult to use Drools if one has to work around such silly bugs.
As a matter of fact, Drools does not seem to handle the presence of multi-line comments in a RHS well.
(Even though the documentation says they're ok:
http://downloads.jboss.com/drools/docs/4.0.4.17825.GA/html_single/index.html#d0e2807

Not sure what is going on. I looked at:
http://viewvc.jboss.org/cgi-bin/viewvc.cgi/labs/labs/jbossrules/branches/4.0.x/drools-compiler/src/main/resources/org/drools/lang/DRL.g?view=markup

which appears to be correct and sends multiline comments to ANTLR's hidden channel.


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