Why it could not find the main class?

java exception noclassdeffounderror mainclass

Roman · Mar 10, 2010 · Viewed 7.7k times · Source

I have a very simple code:

package mygame;
public class RunGame {
    public static void main(String[] args) {
        System.out.println(args[0]);
    }
}

I can compile that code but I cannot run it. When I type "java RunGame" in the command line I get:

Exception in thread "main" java.lang.NoClassDefFoundError: RunGame (wrong name: mygame/RunGame).
....
Could not find the main class: RunGame. Program will exit.

Answer

java mygame.RunGame

is the java executable syntax. i.e, java classname.qualified.with.full.packaging

Also what is the RunColoredTrails class in the output you have shown?

Why it could not find the main class?

Answer

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