why wrong name with NoClassDefFoundError

Question

I created a List.java file in folder UtilityPack which contains this code

package Utilities;
public class List
{
    private class          


        

Answer 1

You need the fully qualified name e.g.

java -cp . Utilities.List

i.e. you're telling the JVM to look from the current direct (-cp .) for a class Utilities.List, which it will expect in the file Utilities\List.class.

To be more consistent you should put the .java file under a Utilities directory (yes - this is tautologous - the package specifies this, but it's consistent practise).

I would also avoid calling your class List. At some stage you're going to import a java.util.List and it'll all get very confusing!

Finally, as soon as you get more than a couple of classes, investigate ant or another build tool, and separate your source and target directories.