Class org.drools.core.util.MVELSafeHelper, obsolete and thread-blocking "synchronized" keyword in static getter of a static final field:

public class MVELSafeHelper {
private static final MVELEvaluator evaluator;
static

{ evaluator = KiePolicyHelper.isPolicyEnabled() ? new SafeMVELEvaluator() : new RawMVELEvaluator(); }

public static synchronized MVELEvaluator getEvaluator()

{ return evaluator; }

//
}