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Because of a limitation in the Java Runtime Environment (JRE), Fedora, Linux, and Solaris clients receive an invalid response from Alt Gr on UK English and US International language keyboards. Fedora, Linux, and Solaris do not pick up events for the Alt Gr key combination for Java 1.5. Java 1.6 appears to improve on this, although the keyPressed and keyReleased events for Alt Gr still identify it as an "unknown key code".
Also, a key pressed in combination with Alt Gr (such as on the UK keyboard Alt Gr-4, which is the Euro symbol), will only generate a keyTyped followed by a keyReleased event for that value without a keyPressed event. Java 1.6 improves upon this by filling in the keyPressed event as well.