Installer Extension (update problem)

Hi,
I tried a little example with the installer extension of JWS. For the first time visit all is fine. The installer is starting and installs something (stupid :-).
Also the second and third time visit all is running fine.
So, I'm happy and try to modify my application. I expect that the installer will called to uninstall and then make a new install with the modified application.
But when I try to call my new application I get an error.
The application hangs during the initialisation process
(downloading installer-descriptor).
In the log I get the following error:
java.lang.NullPointerException
     at com.sun.javaws.LaunchDownload$2.visitExtensionDesc(Unknown Source)
     at com.sun.javaws.jnl.ExtensionDesc.visit(Unknown Source)
     at com.sun.javaws.jnl.ResourcesDesc.visit(Unknown Source)
     at com.sun.javaws.LaunchDownload.checkJNLPSecurityHelper(Unknown Source)
     at com.sun.javaws.LaunchDownload.checkJNLPSecurity(Unknown Source)
     at com.sun.javaws.Launcher.downloadResources(Unknown Source)
     at com.sun.javaws.Launcher.handleApplicationDesc(Unknown Source)
     at com.sun.javaws.Launcher.handleLaunchFile(Unknown Source)
     at com.sun.javaws.Launcher.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Any idea?

I've put my example in the web, see
http://www.mpi.nl/world/tg/j2se/jnlp/test/installer/
Main and Installer are opening exit-buttons each.
I saw the Installer button once, but failed to see him again. Any hint appreciated.
I get the same Exception as in the initial posting:
as soon as any jar or jnlp file is updated (touched)
JWS hangs and must be aborted. Log says NullPointerException at
com.sun.javaws.LaunchDownload$2.visitExtensionDesc
I can confirm what dmullens describes:
setting _default.locallyInstalled=false
in file ELinstaller.jnlp will allow you do get a new update.
But this is no good! It will work only one time
because the next update will set
_default.locallyInstalled=true back which reveals the bug again.
I have two questions:
1) Why don't I see the JFrame of the Installer?
2) Can I change the source code in order to prevent the
visitExtensionDesc Exception?

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ctrl-click on the easyshare installer, choose 'get info' , in the 'Kind' section it will likely say "Application - Universal" If so, then that explains why 1: Installer won't open it, and 2: why there's no 'open with' dialogue for it.
The previous system should be ( just as your Console message said...) in HD/Previous Systems.localized/Previous System 1/ It's not normally invisible.
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Hi,
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