[jboss-jira] [JBoss JIRA] (DROOLS-420) Incorrect resolution of global symbols in LHS rule constraint (Java dialect)

[Mike Rodriguez (JIRA)]

Mike Rodriguez created DROOLS-420:
-------------------------------------

             Summary: Incorrect resolution of global symbols in LHS rule constraint (Java dialect)
                 Key: DROOLS-420
                 URL: https://issues.jboss.org/browse/DROOLS-420
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
            Reporter: Mike Rodriguez
            Assignee: Mark Proctor
            Priority: Minor


As described @ [http://drools.46999.n3.nabble.com/Incorrect-resolution-of-global-symbols-in-LHS-rule-constraint-Java-dialect-tp4027921.html].

I upgraded from 5.5.0.Final of Drools (rule engine) to 5.6.0.Final and I am now seeing errors with globals.   

We have rule constraints that access globals in a DRL; like this:   
{code}some.classpath.package2.MyType ( global_instance.invoke(this) == true ) {code}

I have {code}some.classpath.package.SomeType global_instance;{code} declared at the top of the DRL, but it doesn't seem to be interpreting it as a global in the rule's restriction. 

So, putting this into context within, I have a DRL such as: 

package my.package.example; 

global some.classpath.package.SomeType global_instance; 
{code}

rule "Example rule" 
when 
   some.classpath.package2.MyType ( global_instance.invoke(this) == true ) 
then 
   // do something 
end 

{code}

I am getting an error from the package builder originating from the "Example rule" specifying something like: 
"can't find method MyType.global_instance()" 

Once, again this did work in 5.5.0.Final, but in 5.6.0.Final I am getting a failure trying to build the knowledge package. 
It looks to me like the {{global_instance}} symbol is not being recognized as a global in the DRL and is trying to be 
resolved as a method of the MyType class.   
So I guess it would be trying to do a "MyType.global_instance().invoke(this)" or something. 

The intent is that {{global_instance}} will be set for a session with an immutable function-type of class 
(invoke is an instance method though; not static).  The rule restriction uses this function/predicate to determine if some 
complex criteria is true for `this` MyType instance. 

I would appreciate any insight into what the issue might be.  I haven't been able to find any threads out there on a similar issue. 

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