断点(Breakpoint):CPU执行到某位置的时候，停止执行被调试程序，中断到调试器(break into debugger)，让调试者分析调试。调试者分析完后，可以让被调试程序恢复执行。
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当发生该异常时，在任何错误处理器被激活之前目标立即中断到调试器中。这种处理类型称为第一次处理机会。
When this exception occurs, the target immediately breaks into the debugger before any other error handlers are activated. This kind of handling is called first chance handling.
新建的JSP文件会被编译，应用程序会重新部署到服务器上，而调试器会停在设置中断点的位置。
Your newly created JSP is compiled, the application is redeployed to the server, and the debugger stops at the line you put the breakpoint on.
使用调试器，可以执行下列操作：开始(或继续)执行、中断执行、停止执行、逐句通过应用程序、运行到指定位置以及设置执行点。
Using the debugger, you can start, or continue, execution, break execution, stop execution, step through your application, run to a specified location, and set the execution point.
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