How to solve java.lang.NoClassDefFoundError?

Question

I\'ve tried both the example in Oracle\'s Java Tutorials. They both compile fine, but at run-time, both come up with this error:

Exception in thread \"main\"         


        

Answer 1

After working on a NetBeans project for many months, I suddenly got the NoClassDefFoundError message shortly after getting a "Low Memory" alert. Doing a Clean rebuild didn't help, but closing Netbeans altogether and reopening the project there were no error reports.