JDK-6627324 : Alt Graph doesnot generate any key event when pressing in German locale
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This should be fixed in jdk7 with easy backport to jdk6 but not to 5.0.
Fix would be, just adding a line to an internal hashtable tying X keycode XK_ISO_Level3_Shift with Java keycode VK_ALT_GRAPH. I'll fix it as soon as jdk7 will be open for putbacks.