EJB3 bean classes are packaged in regular JAR files. The standard configuration files, such as ejb-jar.xml for session beans, and persistence.xml for entity beans, are in the META-INF directory inside the JAR. You can deploy EJB3 beans as standalone services in JBoss AS or as part of an enterprise application (i.e., in an EAR archive). In this section, we discuss those two deployment options.