我们可以使用参数绑定来绑定方法参数，返回类型和异常，以及我们希望的目标。

We can use argument binding to bind method parameters, return types and exceptions as well as targets if we wish.

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务必知道，服务接口的方法参数、返回类型和异常必须符合JAX - WS和EJB规范。

It is important to know that the service interface's method arguments, return types, and exceptions must conform to JAX-WS and EJB specifications.

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当带一个值类型调用UniqueResult()和查询返回null时抛出更有意义的异常

Throws a more meaningful exception when calling UniqueResult() with a value type and the query returns null.

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