Although some of the above questions seem to clearly lean to one technology over the other, many stateful scenarios actually call for the use of both servlets and EJB components.

尽管上述一些问题似乎明显地倾向于其中一种技术，但是许多有状态方案实际上既需要使用 servlet 又需要使用 EJB 组件。

youdao

Stateful Web services do not fail over in a clustered Lotus Domino environment because Lotus Domino does not offer asynchronous replication among nodes to replicate sessions and states.

有状态的Web服务在集群的Lotus Domino环境下不能进行故障恢复，因为Lotus Domino没有提供在节点间异步复制会话和状态的功能。

youdao

EJB stateful session bean fail over.

EJB状态会话bean故障转移。

youdao

This says something: even though a stateless network cannot absolutely make guarantees on delivery or completion of its task or even the path it may take, this downside is overcome by the sheer scalability and flexibility of this model over stateful systems.

FORBES: Is Your Employment Model Too Stateful?