NoClassDefFoundError

[Ramm Kummar]

Getting this error while running java. Please suggest. I have defined required things in the classpath

  C:\MyProject\classes\com\wickedlysmart>java CmdArgs
Exception in thread "main" java.lang.NoClassDefFoundError: CmdArgs (wrong name:
com/wickedlysmart/CmdArgs)
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(Unknown Source)
        at java.security.SecureClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.access$000(Unknown Source)
        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)
        at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Could not find the main class: CmdArgs.  Program will exit.  

[Ulf Dittmer]

You always need to give the fully qualified classname: "java com.wickedlysmart.CmdArgs". This should work assuming that the "classes" directory is in the classpath.

[Eric Larsen]

From what I can see, you are currently in the same directory as your .class file. Instead of running the class from here, you should run it from the /classes directory, like this:

C:\MyProject\classes\>java com.wickedlysmart.CmdArgs

That is, assuming that the class includes a package statement at the beginning of the file:

package com.wickedlysmart;