事务问题：EJB 服务端点在部署描述符规定的事务上下文中运行。

Transaction considerations: An EJB service endpoint runs in a transaction context specified in the deployment descriptor.

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由于需要管理缓存着的状态，有状态的组件可能会在Web上下文中出现问题，比如，发生回滚时许多应用都会出问题，因为状态并没有和事务绑定起来。

Stateful components can be problematic in a web context because of managing cached state for example - many applications break when a rollback occurs because the state isn't tied to the transaction.

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