You cannot include jars in a jar. The classloaders will not find classes inside of multiple jars. To do this, you'll need to write ( or find) a custom classloader or better add classes to your JAR File's Classpath according to
"Warning: The text file from which you are creating the manifest must end with a new line or carriage return. The last line will not be parsed properly if it does not end with a new line or carriage return."