access classes in nested jar

Jar tutorial:
http://java.sun.com/docs/books/tutorial/jar
says "To load classes in JAR files within a
JAR file into the class path, you must write
custom code to load those classes."

The number of search result on cljp for
'nested jar' is overwhelming but I just
want an instantly usable/adaptable and
standard or canonical example code
for using classes in a jar in another,
outermost, jar from application code.

If you know the pointers for them, will
you please give.
TIA

.

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