JavaW and Mozilla Firefox 3.6 proxy option conflicts

FULL PRODUCT VERSION :
1.6.0_18

ADDITIONAL OS VERSION INFORMATION :
MS Windows XP Professional SP3

EXTRA RELEVANT SYSTEM CONFIGURATION :
This happened with Mozilla Firefox 3.6

A DESCRIPTION OF THE PROBLEM :
You can't run any javaw aplication when the Mozilla Firefox proxy configuration (about:config > network.proxy.type) is marked as '5'

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Using a Mozilla Firefox browser, type about:config to open the browser configurations. Then search the entry 'network.proxy.type', and choose the value to 5.

Try to run any javaw application and the following error message will appear:

"java.lang.IllegalStateException: DynamicProxyManager: Invalid Proxy Type"

and the application will close.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Were trying to run the application
ACTUAL -
The error message appeared and java didn't run

ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.IllegalStateException: DynamicProxyManager: Invalid Proxy Type

REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER SUBMITTED WORKAROUND :
Changing the forementioned option of Mozilla Firefox the applications run normally