Debugging Netbeans J2SE application

I am trying to debug in Netbeans for the first time. When using F7 to step into my app it doesnt do much of anything besides open the debug window. Under Local Variables, the message:
"Variable information is not available, source compiled without -g option."
Does anyone have any idea of what may be the problem?
thanks

The source was compile without using the option that adds debugging information to the resulting .class file. Either:
- You're trying to debug some JRE library code, not your own. Just step over instead of into. Or,
- it's your code, recompile with the -g option.

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Debugging Netbeans J2SE application

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