Hi everybody, It is possible to use a final global variable into the LHS part of a rule? Since the final global variable is in fact a global constant I think it will be ok to use it in some predicate expression or into an eval of a rule. But I get this ugly exception, when I'm trying to use my global in the LHS part of the rule: Exception in thread "main" org.drools.RuntimeDroolsException: java.lang.NullPointerException I mention that when I use the same global variable in the RHS part of the rule, everything works fine, and I'm getting the appropriate results. Best regards, Oana --------------------------------- Looking for earth-friendly autos? Browse Top Cars by "Green Rating" at Yahoo! Autos' Green Center.