[jboss-jira] [JBoss JIRA] Assigned: (JBRULES-1388) Eval error when using multiple declarations

[Edson Tirelli (JIRA)]

     [ http://jira.jboss.com/jira/browse/JBRULES-1388?page=all ]

Edson Tirelli reassigned JBRULES-1388:
--------------------------------------

    Assignee: Edson Tirelli

> Eval error when using multiple declarations
> -------------------------------------------
>
>                 Key: JBRULES-1388
>                 URL: http://jira.jboss.com/jira/browse/JBRULES-1388
>             Project: JBoss Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>    Affects Versions: 4.0.3
>            Reporter: Hao Chen
>         Assigned To: Edson Tirelli
>
> Just started testing Drools 4.0.3, and found rules like the following will cause ClassCastException when invoked
> when 
>    t1 : T1()
>    t2 : T2()
>    eval(t2.f1>0)
> then
>    ...
> end
> Looked into the source code and found that: in JavaEvalBuilder.java 
>         final Declaration[] declarations = new Declaration[usedIdentifiers[0].size()];
>         for ( int i = 0, size = usedIdentifiers[0].size(); i < size; i++ ) {
>             declarations[i] = context.getDeclarationResolver().getDeclaration( (String) usedIdentifiers[0].get( i ) );
>         }
> This only retrieves the declarations used in the eval, which in the example include only t2.  So the Drools generated code for the eval is like: 
> ...
>        T2  t2 = (T2) declarations[0].getValue( (org.drools.common.InternalWorkingMemory) workingMemory, ( (org.drools.common.InternalFactHandle) tuple.get( declarations[0] ) ).getObject() );
> ...
> which cause ClassCastException at runtime because the declarations[0] passed in is actually t1.

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