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

Your code was compiled with Java 1.5 and your trying to run it with Java 1.4 ( or lower )

The solution is

a) Run it with Java1.5 ( perhaps using WAS 6+ ) 
b) Recompile it with Java 1.4

or

c) Recompile it with Java.15 but specifying the -target flag ( javac -target 1.4 .... ) 

The point is, you are trying to run 1.5 bytecode in a 1.4 vm