Unsupported major.minor version 49.0

Question

I am getting the following exception whenever I login to my application ...

javax.servlet.ServletException: com/sun/org/apache/xalan/internal/xsltc/

Answer 1

This happens when you have compiled your code in a machine that uses a different JDK version to the one you end up running the code in. Make sure you use the same JDK version in these different boxes.