注释：这些异常是针对在运行期间使用JNDI的。

Note: These exceptions are specific to using JNDI at run time.

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如何处理运行期间发生的异常？

How to handle any exceptions that occur at run time?

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如果在第二个try语句运行期间抛出异常，那么请注意，result变量被设置为false。

If an exception is thrown during the second try statement, notice that the result variable gets set to false.

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