Firefox & openJDK && applets problem

Latest Firefox & latest openJDK7 & icedtea-web-java7
Starting Firefox form console and open URL with java applet in console appears errors:
java version "1.7.0_07"
OpenJDK Runtime Environment (IcedTea7 2.3.2) (ArchLinux build 7.u7_2.3.2-2-i686)
OpenJDK Client VM (build 23.2-b09, mixed mode)
File cannot be launched because offline-allowed tag not specified and system currently offline.
java.lang.NullPointerException
at net.sourceforge.jnlp.NetxPanel.runLoader(NetxPanel.java:154)
at sun.applet.AppletPanel.run(AppletPanel.java:379)
at java.lang.Thread.run(Thread.java:722)
java.lang.NullPointerException
at sun.applet.AppletPanel.run(AppletPanel.java:429)
at java.lang.Thread.run(Thread.java:722)
and applet won't run with error in Firefox's status bar: "start: applet not initialized"
If replace openJDK7 & icedtea-web-java7 to openJDK6 & icedtea-web still errors:
java version "1.6.0_24"
OpenJDK Runtime Environment (IcedTea6 1.11.4) (ArchLinux-6.b24_1.11.4-1-i686)
OpenJDK Client VM (build 20.0-b12, mixed mode)
File cannot be launched because offline-allowed tag not specified and system currently offline.
java.lang.NullPointerException
at net.sourceforge.jnlp.NetxPanel.runLoader(NetxPanel.java:154)
at sun.applet.AppletPanel.run(AppletPanel.java:380)
at java.lang.Thread.run(Thread.java:679)
java.lang.NullPointerException
at sun.applet.AppletPanel.run(AppletPanel.java:430)
at java.lang.Thread.run(Thread.java:679)
With jre-7.7 from AUR everything works ok.
Whats wrong with openJDK and icedtea-web ?

Try to disable hardware acceleration.
*Edit > Preferences > Advanced > General > Browsing: "Use hardware acceleration when available"
Create a new profile as a test to check if your current profile is causing the problems.
See Basic Troubleshooting: Make a new profile:
*https://support.mozilla.com/kb/Basic+Troubleshooting#w_8-make-a-new-profile
There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins" in case there are still problems.
If that new profile works then you can transfer some files from the old profile to that new profile (be careful not to copy corrupted files)
See:
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

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