The new test case:
http://comanche.eng.sun.com/jawstest/update/

has test procedure to test version control of application. Suppose there are
multiple versions of the application cached, say V1.0, V2.0, V2.1, if jnlp
file specify the jar version should be used is 1.0+, javaws should launch
the latest version, i.e., 2.1. However, this is broken.

Check the web page of above link, the red blinking 'Bug here' indicates the
step where you will see the reproduced bug.