LinuxQuestions.org - Jar file running problem

Hi!! Trying to run a .jar file by typing

Code:

java file.jar

and returns this back:

Code:

Exception in thread "main" java.lang.NoClassDefFoundError: file/jar

Caused by: java.lang.ClassNotFoundException: file.jar

        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)

And if i type this :

java file.jar it returns this :

Code:

Unable to access jarfile

Does anyone know why this prog can not run ? :s Thanx for your any answers...