src/share/classes/com/sun/tools/jdi/SDE.java

@@ -180,10 +180,15 @@
             } else {
                 return false;
             }
         }
 
+        @Override
+        public int hashCode() {
+            return (lineNumber() * 17) ^ refType.hashCode();
+        }
+
         int lineNumber() {
             return stiLineNumber(sti, lti, jplsLine);
         }
 
         /**