未检查异常作为运行时exception类是理想的异常侯选处理不可恢复性出错，如资源不可用或者空指针。

Unchecked exceptions which are descendents of RuntimeException class are the ideal candidate exceptions handle non-recoverable errors such as resource non-availability or some null Pointers.

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您不必在这个级别上处理异常，因为 Spring 将它们转换为一套通用的未检查异常（unchecked exceptions）。

You don't have to handle exceptions at this level because Spring translates them to a common set of unchecked exceptions.

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使用引入(Introduction)，Aspect可以向类中添加新的方法和变量、声明一个类实现一个接口或将检查异常转换为未检查异常(unchecked exception)。

Using introduction, aspects can add new methods and variables to a class, declare that a class implements an interface, or convert checked to unchecked exceptions.

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