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The control class OrderBean has all of the methods using these objects for the view side. Finally the view side is the interface for the user, calling the methods from the OrderBean. The GetWorkerInfo ...

至于这个OrderBean是从哪个机器来的，作为应用层的我根本不关心，只要我能找到一个这样的EJB对象， 我就可以工作了。 你可能还会问： 难道真的要把OrderBean对象从另外一个机器Copy的你的机器上吗? No No， 根本不是， 这背后的魔法其实是远程方法调用 (RMI),当我去查找对象的时候，看起来应用服务器 ...

This is a one-to-many relationship. Similarly, an OrderBean can have multiple LineItemBean s, but a LineItemBean can have only one OrderBean.