new Gson() fails on appengine

What steps will reproduce the problem?
1. Somewhere in program call 
  Gson gson = new Gson();
2. Run this code (using servlet or unit test) on appengine.
3. Nb! this code works in dev server but fails when deoployed on appengine.

What is the expected output? What do you see instead?
 java.lang.VerifyError: Cannot inherit from final class
    at com.google.appengine.runtime.Request.process-aa8514ea8d01585f(Request.java)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:634)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
    at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:266)

What version of the product are you using? On what operating system?
Gson 2.2.2
Appengine Java SDK 1.6.0

Please provide any additional information below.
It worked with older version of Gson (1.7.1) and same Appengine SDK version 
(1.6.0).

Original issue reported on code.google.com by aleksandr.bg on 28 Aug 2012 at 10:28

rohandalvi / google-gson

new Gson() fails on appengine #468