Question

When I tried to run Java on Linux on the terminal this is what happens:

Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorldApp/class
Caused by: java.lang.ClassNotFoundException: HelloWorldApp.class
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)

Can anyone help me with this?

EDIT: I was in the folder of the bytecode file and ran this on the terminal:

bash-4.1$ java class HelloWorldApp

Source file:

/**
 * The HelloWorldApp class implements an application that
 * simply prints "Hello World!" to standard output.
 */
class HelloWorldApp {
    public static void main(String[] args) {
    System.out.println("Hello World!"); // Display the string.
    }
}

Answer 1

You are executing

java HelloWorldApp.class

but it must be

java HelloWorldApp

You may not append class to your call but name plain the classname.

Also, as others has remarked, it is better to use packages as classes in the default package do not work fine.