--- old/src/macosx/native/sun/awt/AWTWindow.m	2012-06-04 18:39:34.197503000 +0400
+++ new/src/macosx/native/sun/awt/AWTWindow.m	2012-06-04 18:39:33.952488900 +0400
@@ -940,14 +940,19 @@
 (JNIEnv *env, jclass clazz, jlong windowPtr)
 {
 JNF_COCOA_ENTER(env);
-AWT_ASSERT_NOT_APPKIT_THREAD;
 
     NSWindow *nsWindow = OBJC(windowPtr);
-    [JNFRunLoop performOnMainThreadWaiting:NO withBlock:^(){
+    if ([NSThread isMainThread]) {
         AWT_ASSERT_APPKIT_THREAD;
-
         [nsWindow invalidateShadow];
-    }];
+    } else {
+        AWT_ASSERT_NOT_APPKIT_THREAD;
+        [JNFRunLoop performOnMainThreadWaiting:NO withBlock:^(){
+            AWT_ASSERT_APPKIT_THREAD;
+
+            [nsWindow invalidateShadow];
+        }];
+    }
 
 JNF_COCOA_EXIT(env);
 }