There are very few cases where you need to create or edit the MANIFEST for a Java EE
module.The most common case is for an Application Client module, where the
Main-Class attribute is required to define the main class for the component.
In J2EE 1.4 and earlier, the Class-Path attribute can be used in
.wars, application-client .jars, and ejb-jars packaged within an .ear to refer
to library .jars at the .ear level.However, this isn't necessary in Java EE 5,
since any .jars placed in an .ear-level "lib" directory are guaranteed to be
visible to all modules in the .ear.
--ken