jar files

[RAHUL]

should a jar file include a main class name in it manifest file.
and whether jar file can execute without this

[Petrus Pelser]

You do not need to supply the main class' name in the manifest, but then you will not be able to execute it, unless you supply the fully qualified name with the jar in your classpath.

Most of the packages are packaged in this way - i.e. try and execute javaee.jar ...