[rfc][icedtea-web] PR1251: Hack for appcontext & event-queue classloaders

[Adam Domurad]

This puts a bandaid over 
http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=1251. 'Fix' is 
probably too generous.
With this, the SweetHome3D JNLP [1] runs again. The applet version had 
worked before.

This is explicitly *not* wanted for HEAD. I am posting this for review 
now to be considered for any release branches where a proper fix is not 
found. (1.4 definitely, who knows maybe even previous & future releases. 
But such hackery should not be in HEAD.)

2013-XX-XX  Adam Domurad  <adomurad at redhat.com>

         Hack to ensure AppContext is set correctly.
         * netx/net/sourceforge/jnlp/Launcher.java
         (forceContextClassLoaderHack): Force stored class-loader for
         thread-group's AppContext and EventQueue to be our JNLPClassLoader.
         (createApplet): Call forceContextClassLoaderHack.
         (createAppletObject): Call forceContextClassLoaderHack.
         (createApplication): Call forceContextClassLoaderHack.

I have not found any potential problems this may cause (and I've digged 
quite deep). Let me know of any concerns.

[1] www.sweethome3d.com/SweetHome3D.jnlp

Happy hacking,
-Adam
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