--- old/src/macosx/native/sun/awt/CGraphicsDevice.m	2012-07-18 16:29:46.000000000 +0400
+++ new/src/macosx/native/sun/awt/CGraphicsDevice.m	2012-07-18 16:29:45.000000000 +0400
@@ -68,6 +68,11 @@
             // One of the key parameters does not match
             continue;
         }
+
+        if (refrate == 0) { // REFRESH_RATE_UNKNOWN
+            return cRef;
+        }
+
         // Refresh rate might be 0 in display mode and we ask for specific display rate
         // but if we do not find exact match then 0 refresh rate might be just Ok
         if (CGDisplayModeGetRefreshRate(cRef) == refrate) {
@@ -165,7 +170,10 @@
                 }
             }
         }];
+    } else {
+        [JNFException raise:env as:kIllegalArgumentException reason:"Invalid display mode"];
     }
+    
     CFRelease(allModes);
     JNF_COCOA_EXIT(env);
 }