[jboss-jira] [JBoss JIRA] Created: (JBRULES-2975) Cannot use constant from Enum declared in class any more

[Wolfgang Laun (JIRA)]

Cannot use constant from Enum declared in class any more 
---------------------------------------------------------

                 Key: JBRULES-2975
                 URL: https://issues.jboss.org/browse/JBRULES-2975
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: drools-compiler
    Affects Versions: 5.2.0.M2
            Reporter: Wolfgang Laun
            Assignee: Mark Proctor
            Priority: Critical


Note that this was running with a build made around 2011-02-10!

Given the class 

public class Triangle {
    public enum Type {
        INCOMPLETE, UNCLASSIFIED,
        EQUILATERAL, ISOSCELES, RECTANGLED, ISOSCELES_RECTANGLED, ACUTE, OBTUSE;
    }
    private int alpha;
    private int beta;
    private int gamma;
    private Type type;
    public Triangle( int alpha, int beta ) {
        this.alpha = alpha;
        this.beta = beta;
        this.type = Type.UNCLASSIFIED;
    }
     // getters, setter,...
}

and the rule

rule equilateral
when
    $t: Triangle( type == Triangle.Type.UNCLASSIFIED,
                  alpha == beta && == gamma )
then
    modify( $t ){ setType( Triangle.Type.EQUILATERAL ) }
end

this fails with

Exception in thread "main" org.drools.RuntimeDroolsException: [Error: object is not an instance of declaring class]
[Near : {... Triangle.Type.UNCLASSIFIED ....}]
             ^
[Line: 1, Column: 1]
	at org.drools.rule.ReturnValueRestriction.isAllowed(ReturnValueRestriction.java:258)
	at org.drools.rule.VariableConstraint.isAllowed(VariableConstraint.java:103)
	at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:134)
	at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:450)
	at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:378)
	at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:185)
	at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:143)
	at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:332)
	at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:293)
	at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:905)
	at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:864)
	at org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:251)
	at rss.drools.setup.Application.insert(Application.java:141)
	at ex4.Main.makeFacts(Main.java:35)
	at rss.drools.setup.Application.execute(Application.java:83)
	at ex4.Main.main(Main.java:40)
Caused by: [Error: object is not an instance of declaring class]
[Near : {... Triangle.Type.UNCLASSIFIED ....}]
             ^
[Line: 1, Column: 1]
	at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:427)
	at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:140)
	at org.mvel2.ast.ASTNode.optimize(ASTNode.java:158)
	at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:115)
	at org.mvel2.MVELRuntime.execute(MVELRuntime.java:87)
	at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:125)
	at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:118)
	at org.mvel2.MVEL.executeExpression(MVEL.java:954)
	at org.drools.base.mvel.MVELReturnValueExpression.evaluate(MVELReturnValueExpression.java:88)
	at org.drools.rule.ReturnValueRestriction.isAllowed(ReturnValueRestriction.java:247)
	... 15 more
Caused by: java.lang.IllegalArgumentException: object is not an instance of declaring class
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:616)
	at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getBeanProperty(ReflectiveAccessorOptimizer.java:514)
	at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:335)
	... 24 more



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