java.lang.IncompatibleClassChangeError: Implementing class deploying to app engine

Question

I wrote a couple of REST services using Jersey 1.13 on JRE 1.6. Everything runs fine locally, but after I deploy to GAE I get this error:

****Uncaught excep         


        

Answer 1

Did you update your App engine's SDK? (Recently the App engine SDK was updated from 1.7.0 to 1.7.1.)

Try to revert your app engine's SDK to 1.7.0. I have tried many solutions that I found on the Internet, none of them worked for me, but this one worked.

I have no idea how I can safely change my app engine project's sdk version for now. If anyone knows how to change the SDK version of the app, please let me know.