I was working with a Twitter Java app in NetBeans, and suddenly I couldn't run my project from NetBeans 6.8. The strange thing was that I could compile it on NetBeans and then run the jar file on a terminal window! After two stinking hours of struggling with my project configuration, I found out it was a problem with the classpath, thanks to the tips I found on http://en.allexperts.com/q/Java-1046/main-class.htm.
So, basically, if suddenly you cannot run projects on NetBeans, try fixing up your classpath, and maybe your problem will be solved.
On Windows, type
set CLASSPATH=.;%CLASSPATH%
on a Command Prompt window.
On Linux, type
CLASSPATH=.:$CLASSPATH
export CLASSPATH
export CLASSPATH
On a terminal window.
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