Steps to reproduce

1.Invoke javaws -uninstall to clear cache or clear cache using Java control panel
2. Open http://mossad.us.oracle.com:8080/basicAuth/tests/fxfeaturesTest/fxfeaturesTest/html/ShowDocumAuthSCJNLPTest.html inside new browser window
3.There should be Authenticated pop-up from browser. Enter credentials as User: jituB and password: jitu20
4 Click on "Webstart: click to launch this app as webstart"
5. There should be Authenticated pop-up from Java. Enter credentials as User: jituB and password: jitu20
6. If jituB didn't show up in username field, the bug is reproducible. Press left arrow. The word will show up

Note:
If the jnlp application is launched by javaws, the pop-up field is OK.
If the user started with other character rather than "j", the username field also works fine.