小结

如果DB不一到，记得要修改两个地方，
default/deploy/xxx-ds.xml
persistence.xml中的hibernate.dialect

Sessionbean的JNDI的名字规则是：EAR_NAME + "/" + BeanName + "/" + local/remote,因此JNDI的名字根据Project是否以EAR方式发布相关。

exception

javax.ejb.EJBException: Invalid invocation of local interface (null container)

Hello,
You're trying to get a local EJB to your client (which is out of the server jvm so not local to the server).
You must use @Remote instead of @Local of your business Interface Calculator.
Good luck !