Abstract Method Error

Question

I am working on a project in netbeans that when I launch it using the glassfish 3.1.2.Everything works fine.But when i call the /invite url which is mapped to following meth

Answer 1

This error occurs because an abstract method is called without actual implementation. It usually happens after some library is upgraded while some is not. The dependencies are missing somehow.

Hence please check whether all library upgrades complete successfully.

Here is a good example and demonstration on how an AbstractMethodError can occur.