Bad package name of main-class, javafx 1.3, java 7u15

Hello,
I'm facing the same problem as what I read in this previous thread from someone else:
Bad package name of main-class
I originally tried to hijack it and rip ownership of that thread away for my own issue but a kind forum moderator has split my post away to let it stand on its own, as I should have done to begin with.
My question is ...
... and I don't have any solution. I am using a javaFX app (1.3) which works perfectly with jre 1.6_11 and 1.7_11, but not with 1.7_15. The exception "Bad package name of main-class" is logged in the console.
I read on the Internet that fixes in java 1.7_13 cause problems to all self-signed applet. So I signed mine with a trusted certificate delivered by my company, and I checked what pmgrundy said 2 posts before, but it didn't solve the problem.
My jnlp file is corresponding to the example given in the official tutorial for applet deployment (http://docs.oracle.com/javafx/1.3/tutorials/deploy-applet/#configure), so the main targeted class is "com.sun.javafx.runtime.adapter.Applet".
Do you have information that can help me in solving this problem ?
Thanks in advance,
Sébastien.

Some additional information to the problem, if it can help :
With JRE 6u43 : the applet is initialized and working properly. So the problem might not be due to the security fixes, as this version is including them.
With JRE 7u15 & 7u17 : I tried to run the applet with the runtime v1.3.0_b412, then v1.3.1_b101a, but the problem is the same.
When tracing is enabled through the Java Control Panel, the following lines are displayed at the end of the log :
basic: passing security checks; secureArgs:true, allSigned:false
basic: continuing launch in this VM
preloader: Delivering: DownloadEvent[type=verify,loaded=1, total=1, percent=100]
preloader: Start progressCheck thread
basic: exception: Bad package name of main-class.
ExitException[ 3]java.lang.SecurityException: Bad package name of main-class
     at sun.plugin2.applet.Plugin2Manager.initAppletAdapter(Unknown Source)
     at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
preloader: Delivering: ErrorEvent[url=null label=Bad package name of main-class cause=Bad package name of main-class
preloader: Stop progressCheck thread
ui: Show default error panel
security: Reset deny session certificate storeI think that the lines preceding those lines are about the validation of the different jars included, using the certificates. When the certificates are not installed on the user workstation, 2 dialog boxes are displayed during the applet validation, so as to ask the users if the applet should be run (and the JavaFX runtime). The certificates are well displayed as trusted. Then, after acceptance, the error occurs.
Edited by: sebadavi on Mar 13, 2013 5:07 AM

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