java – Spring MVC中的嵌套异常处理

2019年7月27日 173次阅读

我收到以下错误：

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.NullPointerException

为了在控制器中处理这个问题,我使用了以下代码：

@ExceptionHandler(NestedServletException.class)
public ModelAndView handleServletErrors(){
    System.out.println("Servlet Exception is thrown");
    ModelAndView mv = new ModelAndView("error"); 
    mv.addObject("error", "Error encountered while processing reqeust.");
    return mv;
}

但是这并没有处理上面抛出的异常.如果我使用NullPointerException类而不是NestedServletException,它可以工作.由于Spring在响应NullPointerException时抛出异常,不应该由上面的代码处理吗？

最佳答案 引用
@ExceptionHandler的文档：

Annotation for handling exceptions in specific handler classes and/or handler methods.

此注释将允许方法处理由处理程序方法引发的异常,即使用@RequestMapping注释的方法.引用Spring reference：

You can do that with @ExceptionHandler methods. When declared within a controller such methods apply to exceptions raised by @RequestMapping methods of that contoroller (or any of its sub-classes). You can also declare an @ExceptionHandler method within an @ControllerAdvice class in which case it handles exceptions from @RequestMapping methods from many controllers.

由于处理程序抛出的异常是NullPointerException,因此异常处理程序方法将处理该特定异常.它不会处理Spring用来封装servlet异常的泛型NestedServletException.

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