Handling Controller Exceptions in a JSP

[KBThakur]

What is the best way to send information about an exception back to a JSP from a SimpleFormController.

For instance, I have the following code in the onSubmit(..,..) of my SimpleFormController :

public ModelAndView onSubmit(Object command, BindException arg1){
String resultView = "success";
try {
doSomething();
} catch (AppSecurityException e) {
arg1.reject("message.key.from.properties");
resultView = "failure";
}
ModelAndView mav = new ModelAndView(resultView);
return mav;
}

I did try adding the errors into a list and sending it as a model object but I don't see it as the best approach.

Thanks in advance for the help .

[katentim]

Why not use a separate page. For example:

	<bean id="exceptionResolver" class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
		<property name="exceptionMappings">
			<props>
				<prop key="org.springframework.dao.DataAccessException">dataAccessFailure</prop>
				<prop key="orgmycompany.AppSecurityException">securityAccessFailure</prop>
		</property>
	</bean>

securityAccessFailure.class=org.springframework.web.servlet.view.JstlView
securityAccessFailure.url=/WEB-INF/jsp/securityAccessFailure.jsp

[KBThakur]

For instance, if the user had entered an invalid password on a login screen. he/she should be taken back to the same screen with the appropriate error message instead of to a different screen.

[mrcrazy]

I was just having a similiar issue and this is the onSubmit I made up for the logon page

    public ModelAndView onSubmit(HttpServletRequest request, HttpServletResponse response, Object command, BindException errors) throws Exception {
        Logon logon = (Logon)command;
        // Check password
        User user = getArchive().loadUser(logon.getHandle());
        if (user == null)
            errors.rejectValue("handle", "logon.error.bad.handle");
        else if (logon.getPassword().compareTo(user.getPassword()) != 0)
            errors.rejectValue("password", "logon.error.bad.password");
        if (errors.getErrorCount() != 0) {
            return showForm(request, response, errors);
        }
        // Create login Cookie
        javax.servlet.http.Cookie cookie = new javax.servlet.http.Cookie("handleMilage", user.getId().toString() );
        cookie.setMaxAge(60*60*24*365);// sets age to one year
        response.addCookie(cookie);//        String handle = web.util.Cookies.getCookieValue(request.getCookies(), "handleMilage");
        //
        return new ModelAndView(getSuccessView(), "userId", user.getId());
    }

[KBThakur]

Thanks a lot, this helped