异常类是只能在应用程序执行期间加载的类的另一个例子，因为异常在理想情况下(但不一定会遇到这种情况)很少发生。
Exception classes are another example of classes that may not load until well into an application's execution, because exceptions are ideally (though not always) rare occurrences.
测试应用程序和初始化testclient . jsp时，会发生如下的异常。
When testing the application and initializing the TestClient.jsp, the following exception occurs.
Transaction Demo应用程序中的Add Records with Failure菜单项演示了当操作过程中发生异常时事务将如何处理。
The Add Records with Failure menu item in the transaction demo application demonstrates what happens to a transaction when an exception occurs sometime during the operation.
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