Defines a new package by name in this URLClassLoader. The attributes contained in the specified Manifest will be used to obtain package version and sealing information. For sealed packages, the additional URL specifies the code source URL from which the package was loaded.

Parameters:

name		the package name
man		the Manifest containing package version and sealing information
url		the code source url for the package, or null if none

Returns:  the newly defined Package object

Exceptions:

IllegalArgumentException

if the package name is already defined by this class loader

@revised 9
@spec JPMS