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It seems the IDE locks the class files at Excecution. To test it write a simple Hello World program then try it with 'F6'. Change the source, and try to compuile it you will get a message similar to the following in the compiler output. TestBug.java [11:1] Error: Unable to write file "C:/develop/TestBug.class".
[200301020100] [JDK1.4.1] Leslie, it works for me. What compiler did you use?
??? issue 27383 ???
Restarting the computer solved the problem. It seems to be an OS bug.
Marking as CLOSED, last comment is 3 years old and it is not valid issue.