EJB

JBossのEJBコンテナも相当洗練されたアーキテクチャのようです．

AdminDevelより引用（P.249）：

The JBoss 3.2.x EJB container architecture is fourth generation design that emphasizes a modular plug-in approach. All key aspects of EJB container may be replaced by custom versions of a plug-in and/or an interceptor by a developer. This approach allows for fine tuned customization of the EJB container behavior to optimally suite your needs. Most of the EJB container behavior is configurable through the EJB jar META-INF/jboss.xml descriptor and the default server-wide equivalent standardjboss.xml descriptor. We will look at various configuration capabilities throughout this chapter as we explore the container architecture.

期待が膨らみます．