JDK-6499736 : NPE is thrown from XToolkit.getScreenInsets() if no window manager is present
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In XToolkit.getScreenInsets() the first check is that _NET protocol is active, with 'if (!netProto.active())'. However, this check throws NPE is netProto is NULL, that occurs with no WM present in the system.
The bug is introduced with the fix for 4737732 (screen insets).