OPENJPA-2675 implement null-check for CriteriaQueryImpl#equals

txs to Kaloyan Spiridonov for the catch!


git-svn-id: https://svn.apache.org/repos/asf/openjpa/trunk@1768191 13f79535-47bb-0310-9956-ffa450edef68

openjpa-persistence/src/main/java/org/apache/openjpa/persistence/criteria/CriteriaQueryImpl.java

@@ -736,6 +736,10 @@ class CriteriaQueryImpl<T> implements OpenJPACriteriaQuery<T>, AliasContext {
     }
     
     public boolean equals(Object other) {
+        if(other == null) {
+            return false;
+        }
+        
         if (toString().equals(other.toString()))
             return true;
         return false;