I need to create a JAR file of my java project. In my project I have added 3 additional jar files - jython-2.5.4-rc1.jar,netty-3.9.0.Final.jar and commons-codec-1.9.jar. I have created JAR file of my project from Eclipse. But when I try to run that jar file from command promt (java -jar myjar.jar) I get NoClassFoundException for one of my additional jar files. Any idea why I am getting this error.