Live Connect: Javascript-Java comm: java40.jar

Does anybody know where I can get ahold of "java40.jar", or its latest
equivalent?

It contains JSQbject.class and JSException.class, needed for Live Connect
applet-javascript communication.

It used to be distributed with the old Netscape Communicator, with a whole
lot of Netscape Java Classes.

The latest Netscape does not include any such distribution, and, as you
would expect, there is no information whatsoever from Netscape on the
subject.

Thanks in advance,
Laurence