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

[Hao Chen (JIRA)]

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


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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