exception in thread 'main' java.lang.NoClassDefFoundError:

Question

The following program is throwing error:

public class HelloWorld {
    public static void main(String args[]) {
        System.out.println(\"Hello World!\");         


        

Answer 1

I finally found this as a bug with Apache Netbeans editor:

Below steps will remove the error:

1. Rename the filename & class to Abc
2. Close the editor
3. Reopen the editor
4. Rename the filename & class, from Abc, back to the previous name
5. Now debug project (Ctrl+F5) works fine

Hope that helps, if you are using new Apache Netbeans (not old Netbeans)