Create an index of classes in a lib directory

java_list_classes command

[Stackoverflow attibution](https://stackoverflow.com/questions/15601469/jar-not-loaded-see-servlet-spec-2-3-section-9-7-2-offending-class-javax-serv)

You may find the following windows command line useful in tracking down the offending jar file. 
it creates an index of all the class files in all the jars in the folder. Execute from within the lib folder of your deployed app, 
then search the index.txt file for the offending class.

for /r %X in (*.jar) do (echo %X & jar -tf %X) >> index.txt