DragExample.jnlp won't run in 6u10 plugin release notes

FULL PRODUCT VERSION :
java version "1.6.0_10-beta"
Java(TM) SE Runtime Environment (build 1.6.0_10-beta-b24)
Java HotSpot(TM) Client VM (build 11.0-b12, mixed mode, sharing)


ADDITIONAL OS VERSION INFORMATION :
Ubuntu 8.04 (hardy) x86 desktop

A DESCRIPTION OF THE PROBLEM :
draggable applet (jnlp) won't relaunch from desktop icon

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Install demo applet from https://jdk6.dev.java.net/plugin2/#EXPERIMENTAL_FUNCTIONALITY, then drag applet from browser, then close original browser page to trigger creation of desktop icon (jnlp).

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Same applet running standalone as that runs with browser (Firefox 3)
ACTUAL -
Desktop jnlp won't run, see error below:

ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.NoClassDefFoundError: netscape/javascript/JSException
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
at java.lang.Class.getConstructor0(Class.java:2699)
at java.lang.Class.newInstance0(Class.java:326)
at java.lang.Class.newInstance(Class.java:308)
at com.sun.javaws.Launcher.executeApplet(Launcher.java:1182)
at com.sun.javaws.Launcher.executeMainClass(Launcher.java:1114)
at com.sun.javaws.Launcher.doLaunchApp(Launcher.java:965)
at com.sun.javaws.Launcher.run(Launcher.java:121)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.ClassNotFoundException: netscape.javascript.JSException
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at com.sun.jnlp.JNLPClassLoader.findClass(JNLPClassLoader.java:257)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
... 10 more

REPRODUCIBILITY :
This bug can be reproduced always.