Please see bug 5055861... (use the sample code provided in this bug)

platform: win 2000;
locale: english;
enable russian keyboard layout;
java: 1.5.0-beta b51

After compiling and runing the sample code once, it often becomes imposible to re-run the code w/o recompiling it again. Java throws the following exeption when re-runing the code:

Exception in thread "main" java.lang.IllegalArgumentException: Invalid key code
        at sun.awt.windows.WRobotPeer.keyPress(Native Method)
        at java.awt.Robot.keyPress(Unknown Source)
        at KeyTest.performTest(KeyTest.java:88)
        at KeyTest.<init>(KeyTest.java:30)
        at KeyTest.main(KeyTest.java:34)

I.e. javac KeyTest.java
java KeyTest
java KeyTest (repeat a few times)