Question

I’m using NetBeans IDE to code a java program. When I run the program from NetBeans it works perfectly but when I run it from command prompt I get the following:

Exception in thread "main" java.lang.NoClassDefFoundError: javaapplication/Main
Caused by: java.lang.ClassNotFoundException: javaapplication.Main
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
Could not find the main class: javaapplication.Main. Program will exit.

I used another program (myEclipse) to build the program but the exact thing happened, I’m only able to run the program from the IDE and not command prompt.

Answer 1

Well, is javaapplication.Main meant to be the main class? If not, it’s probably a mistake in the manifest file.

If it is meant to be the main class, look inside the jar file (e.g. by extracting it). Look for a directory called javaapplication which should have a file called Main.class in.

One of those two things is wrong, but we can’t really tell what it is from here – only you can.