Static State Shared from Libs Shared Among Webapps

One of the disadvantages of placing application libraries in the Tomcat lib folder is thread safety issues.

... if any of the classes has static state, you will find that the state is now shared across all webapps. This can cause the objects / types from one webapp to be seen by another, which can cause problems.

Stephen C http://stackoverflow.com/questions/12162654/how-to-make-war-file-take-up-less-memory