This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
I'm not familiar with Orion Server, but if it follows the Servlet 2.2 specification, then all classes should be in a standard package tree in a WEB-INF/classes directory below the root for your web application. Depending on your server and its configuration, it may auto-compile java source files if placed in the same directory.