I'm unable to running Java; I get a ClassNotFoundException error.

After updating to the latest version of Java (7.10), I am unable to run Java at all. Upon detection of Java (http://java.com/en/download/testjava.jsp), I get an error message and when I click, it says there is a ClassNotFoundException error. I tried to reinstall Firefox, reinstall this version of Java and some older versions, try Chrome and IE9, and in any case, I met the same problem. On my addons, it appears as usual, and installation works very well. Both:

  • Next-generation Java plug-in for browsers Mozilla 10.10.2
  • Deploy Script NPRuntime plugin Library for Java (TM)

Are enabled, next to the browser settings on the parameters of control of Java, and I cleared the cache as well. I tried all the relevant patches on http://java.com/en/download/testjava.jsp. I have absolutely no idea what to do. I've tried everything. Anyone of you have any suggestions?

Hey all, I just wanted to post the solution I came to. I found another thread which solved my problem (https://forums.oracle.com/thread/2397610), in particular the last post. It boils down to this line:

"I used the tip above to add in the Panel / Java / Java / View / Runtime settings the value - Djava .net .preferIPv4Stack = true for my 2 JRE then saved and restarted my browser and suddenly he worked.*.

It suddenly worked for me also. Good luck!

Tags: Firefox

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