This exception, if not handled, often causes a run time failure.
如果不处理这个异常,常常会导致运行时故障。
If the server-side code fails, the failure method is called with the thrown exception as its argument.
如果服务器端代码失败,则将调用失败的方法,并用抛出的异常作为参数。
If an exception is thrown, then the exception indicates the cause of the failure.
如果抛出了异常,那么这个异常会指出失败的原因。
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