--- old/test/jdk/java/awt/Toolkit/RealSync/Test.java	2018-02-21 06:54:13.000000000 -0800
+++ new/test/jdk/java/awt/Toolkit/RealSync/Test.java	2018-02-21 06:54:12.000000000 -0800
@@ -24,6 +24,7 @@
 /*
   @test
   @bug 6252005
+  @key headful
   @summary Tests that realSync feature works
   @author denis.mikhalkin: area=awt.toolkit
   @modules java.desktop/sun.awt
@@ -150,7 +151,7 @@
             }
         }
         errors.clear();
-        System.exit(1);
+        throw new Error();
     }
 
     public static void asser(boolean value) {