在spring mvc 3.0中如何在同一jsp中显示运行时错误消息或sql错误消息

Question

When any exception occured in catch block then how can we show the error message in the same jsp i.e employee.jsp and how to jsp should look like?
am getting this error message in the console;what is the meaning of this error?
ERROR: org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver - Failed to invoke @ExceptionHandler method: public org.springframework.web.servlet.ModelAndView com.kesava.tutorial.controller.HomeController.addEmployee(com.kesava.tutorial.dto.EmployeeDTO,org.springframework.validation.BindingResult) throws com.kesava.tutorial.util.SpringUtilException
java.lang.IllegalStateException: No suitable resolver for argument [0] [type=com.kesava.tutorial.dto.EmployeeDTO]
@RequestMapping(value = "/addEmployee", method = RequestMethod.POST)
    @ExceptionHandler({ SpringUtilException.class })
    public ModelAndView addEmployee(@Valid EmployeeDTO employeeDTO,
            BindingResult result) throws SpringUtilException {
        ModelAndView mav = new ModelAndView("employee");
        if (result.hasErrors()) {
            List employees = employeeDao.getAllEmployees();
            return new ModelAndView("employee", "employeeList", employees);
        } else {
            BeanUtils.copyProperties(employeeDTO, employees);
            System.out.println("addEmployee employees! " + employees);
            try {
                employeeDao.persist(employees);
            } catch (EntityExistsException e) {
                throw new SpringUtilException(e, "Employee Duplicate");
            } catch (Exception ex) {
                throw new SpringUtilException(ex, "Failed to add Employee");
            }
            // after inserting show the employees
            List employees1 = employeeDao.getAllEmployees();


            mav.addObject("isDataSaved" , "Data saved Successfully");
            mav.addObject("employeeList" , employees1);

            return mav;

        }
        }

Answer 1

如果希望看到JSP输出中的错误，请不要使用System.out.println。相反，将异常堆栈跟踪添加到您在JSP中打印出来的模型对象中。

类似于：

try { 
   employeeDao.persist(employees); 
} 
catch (EntityExistsException e) { 
   model.addAttribute("error", e.getMessage()); 
}

这样您就可以在JSP中看到异常并打印它。您可以通过属性键访问它，如下所示:${error}