FULL PRODUCT VERSION :
java version "9-ea"
Java(TM) SE Runtime Environment (build 9-ea+161)
Java HotSpot(TM) 64-Bit Server VM (build 9-ea+161, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Windows 7 Enterprise
Serevick Pack 1

A DESCRIPTION OF THE PROBLEM :
 1) Set browser's Proxy server setting to a proxy server that needs an authentication
 2) Java proxy setting is set to 'Use browser settings'
 3) Launch JNLP file. Its codebase should be applicable by the proxy server

Instead of prompting the user/password for proxy server when condition 2) is not met, it always show 'Unable to tunnel through proxy. Proxy returns "HTTP/1.0 407 Unauthorized' error.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
 1) Set browser's Proxy server setting to a proxy server that needs an authentication
 2) Java proxy setting is set to 'Use browser settings'
 3) Launch JNLP file. Its codebase should be applicable by the proxy server


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
It should prompt for user/password for proxy server
ACTUAL -
 it always show 'Unable to tunnel through proxy. Proxy returns "HTTP/1.0 407 Unauthorized' error.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
'Unable to tunnel through proxy. Proxy returns "HTTP/1.0 407 Unauthorized' error.

REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER SUBMITTED WORKAROUND :
Use other mean to set the proxy for Java ( other than 'Use browser setting' )