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I tried to compile and run the simple HelloWorld App. in the first example of the IDE tutorial. It compiled fine, but when I tried to run it I received this exception. I'm new to the environment and Java, so I'm afraid I can't offer much help on this one. I've enclosed the log file.
Created attachment 34065 [details] Log file
I am closing all reports in category Java/Unsupported as wontfix. These should be dead issues --- if the reported cases are against some live part of the NetBeans IDE please reopen and we can discuss to which category they belong.