摘录自：http://stackoverflow.com/questions/1630002/java-lang-noclassdeffounderror-javax-mail-authenticator-whats-wrong
You need to add two jars into the WEB-INF/lib directory or your webapp (or lib directory of the server):
java.lang.NoClassDefFoundError: javax/mail/Authenticator
原文：http://www.cnblogs.com/haimishasha/p/6067633.html
