FULL PRODUCT VERSION :
java version "1.6.0-beta2"
Java(TM) SE Runtime Environment (build 1.6.0-beta2-b86)
Java HotSpot(TM) Client VM (build 1.6.0-beta2-b86, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]
Service Pack 2

A DESCRIPTION OF THE PROBLEM :
Java Web Start fails to load the JNLP file located at:
http://www.testmagelo.com/mu/magelo-update.jnlp. It worked fine with Java 5.0_07 and now fails with Java 6 beta2.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Run javaws http://www.testmagelo.com/mu/magelo-update.jnlp from the command line

or

1. Load the URL in the browser, the application starts
2. Reload the same URL in the browser, the application no longer starts and a MissingFieldException is thrown


ERROR MESSAGES/STACK TRACES THAT OCCUR :
MissingFieldException[ The following required field is missing from the launch file: <jnlp>]
at com.sun.javaws.jnl.XMLFormat.parse(Unknown Source)
at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
at com.sun.javaws.Main.launchApp(Unknown Source)
at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
at com.sun.javaws.Main$1.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)


REPRODUCIBILITY :
This bug can be reproduced always.