When trying to clear JPI cache using "CLEAR" action while applet is running,
the JPI removes entries from cache table (idx files) but does not remove JAR
files. There is no error message. When trying to remove indivisual archives
from the list brought up from VIEW there is error message that the file is
in use and the cache entry does not disappear.

Three issues:
a. If there is a cache sise limit and its reached - the plug-in does not
allow to download more archives since there are still JARs (zips) on the
hard drive.

b. Clearing cache when the JARs are in use must display same error message
and there must be no removal of the idx files.

c. The user sees empty cache list although there are physical files on the
hard drive.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Download jars to cache and try to clear it using the Clear button from JPI
control panel. No error message will be shown. The View cache will be empty.
But phiysical files (zips) will still be present on your hard drive.

EXPECTED VERSUS ACTUAL BEHAVIOR :

EXPECTED -

The error message should apper to notify the user that archives are in use.
The archives should remain in the cache table. No deletion of idx files
should take place.
ACTUAL -
No error messages, idx files are removed, but jars aren't

REPRODUCIBILITY
This bug can be reproduced always.
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