The “Realms” section in Chapter 2, “Securing Applications,” in the Sun Java System Application Server Platform Edition 8.2 2006Q1 Developer’s Guide incorrectly refers to extending com.sun.appserv.AbstractLoginModule, however this class is now named com.sun.appserv.AppservLoginModule.
Refer to com.sun.appserv.AppservLoginModule instead of com.sun.appserv.AbstractLoginModule.