EJB 备忘录

熟读三个spec就行了：
ejb-3_0-fr-spec-ejbcore.pdf
ejb-3_0-fr-spec-simplified.pdf
ejb-3_0-fr-spec-persistence.pdf

spec摘录：
The Enterprise JavaBeans architecture defines the following types of enterprise bean objects:
* A session object.
* A message-driven object.
* An entity object.

Session Bean：
The EJB specification defines both stateful and stateless session beans.There are differences in the API
between stateful session beans and stateless session beans.



Session bean的三种访问客户端：
Remote clients
Local clients
Web Service clients（ Only Stateless session beans may have web service clients.）

怎样区分客户端的访问是Remote还是Local的？
看是否在同一个jvm中。
访问方式Remote和Local的区别：
参数传递不一样。Remote传值，Loca传址（引用）