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I just downloaded the Oracle distribution of Java 7u5 for OS X: http://www.oracle.com/technetwork/java/javase/downloads/index.html When I start NetBeans using this version of Java and go into fullscreen mode, the system menu bar at the top disappears and leaves a light gray colour. If I mouse near the menu, it appears again. The expected behaviour in OS X is that the menu bar disappears, but the area it leaves behind is collapsed and filled by the application. This is what happens with the Apple Java 6 distribution. Workaround: use Java 6.
Reproduced with JDK 7 updates 4, 5 and 6
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8003173