Under some scenarios applet are not launched properly from desktop shortcut and following exception is getting thrown.
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 sun.plugin2.applet.JNLP2Manager.initialize(Unknown Source)
at sun.plugin2.applet.viewer.JNLP2Viewer$1.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Error while initializing manager: MissingFieldException[ The following required field is missing from the launch file: <jnlp>], bail out

Steps to reproduce:
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1) Install 6u12
2) Lauch an applets from following page
https://jdk6.dev.java.net/plugin2/

3)Under Experimental Functionality , try to drag the applet out of browser and click reload
4) Propmt to create desktop shortcut should be there.
5) "Yes" to shortcut creation , shorccut "Simple Draggable Applet Example" should get created on desktop.
6) Try to click on shortcut and if above mentioned exception is thrown and applets fails to launch then bug is reproduced