FULL PRODUCT VERSION :
java version " 1.7.0_40-ea "
Java(TM) SE Runtime Environment (build 1.7.0_40-ea-b35)
Java HotSpot(TM) 64-Bit Server VM (build 24.0-b54, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
1. Run http://jenkins-ci.org/jenkins.jnlp (by clicking in a browser, or download and run with "javaws jenkins.jnlp")
2. You will get:

java.lang.NullPointerException
at com.sun.javaws.Launcher.prepareToLaunch(Unknown Source)
at com.sun.javaws.Launcher.prepareToLaunch(Unknown Source)
at com.sun.javaws.Launcher.launch(Unknown Source)
at com.sun.javaws.Main.launchApp(Unknown Source)
at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
at com.sun.javaws.Main.access$000(Unknown Source)
at com.sun.javaws.Main$1.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

Expected behavior: A user-friendly error message of what went wrong


REPRODUCIBILITY :
This bug can be reproduced always.