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

If your project is in a package like com.blahcode and your class is called Main, the compiled files may be output in a directory structure like ./out/com/blahcode/Main.class. This is especially true for IntelliJ IDEA.

When trying to run from a shell or cmd, you need to cd to that which contains com as a sub-directory.

cd out
java -classpath . com.blahcode.Main