java preferences fails to launch

I can no longer run JavaPreferences, it fails to launch with the message

"A static initializer of the main class threw an exception: java.lang.NullPointerException..

a while ago

StergUK gave this anwer, :

OK, after panicking a bit I have found the solution to this.

Go to /System/Library/Frameworks/JavaVM.framework/Versions/ and delete 1.6.0 folder and 1.6.

Then download this file:

http://www.cs.washington.edu/homes/isdal/snowleopardworkaround/java.1.5.0-leopard.tar.gz

Decompress the file and you should have a folder named 1.5.0.

Copy that folder to the /System/Library/Frameworks/JavaVM.framework/Versions/ replacing the old one. A window will pop up for version authentication. Click "Authenticate" and replace the old folder with the one from the java.1.5.0-leopard.tar.gz.

Run Java Preferences from Utilities and you are good to go.

I have tried, but I still cannot run Java preference and get the same answer : "A static initializer of the main class threw an exception: java.lang.NullPointerException..

can anyone help?