Bind global errors to Spring form and throw them to view

[Vyas Sanzgiri]

Is there any best practice when binding global errors to Spring form (say service class throws exceptions)? Do we use reject and spring:errors to deal with such case?

[Hong Anderson]

Errors should be used for displaying validation errors.

[Vyas Sanzgiri]

Can I have any sample code or web site. On the Spring web documentation they have just given field validation errors information.

[Vyas Sanzgiri]

I am trying to handle basic errors in service class (not form validation errors). Below is my controller

	@RequestMapping(value = "/editPidProcessParams.do")
	public ModelMap editPidProcessParams(@ModelAttribute("input") Input input, BindingResult result) {
		try {
			throw new Exception("MyError"); //service class with throw exceptions here 
		} catch (Exception e) {
			result.reject("error.app.binding.webform", "Error!!!");
		}
		ModelMap map = new ModelMap("command", result.getModel());
		return map;
	}

JSP snippet:

				<spring:hasBindErrors name="command">
					<c:forEach items="${status.errorMessages}" var="errorMessage">
						<li>
							<c:out value="${errorMessage}" />
							<br />
						</li>
					</c:forEach>
				</spring:hasBindErrors>

I do not get any result in the JSP snippet. "Input" form binds and gets me the results but I do not see any output for the errors. Is there something obvious that I am missing?

[Hong Anderson]

I have never used ModelMap. But the following code:

new ModelMap("command", result.getModel()); 

It mean you add a map into a map. I doubt it would work.

Where did you get the example code?

[Hong Anderson]

You should ask in Spring Source forum also. I've very little experience in Spring Annotation. I'm afraid I couldn't help you much on this.

[Vyas Sanzgiri]

The code I have provided works. I found it out from various articles.

[Vyas Sanzgiri]

OK I got it. I changed name="input" instead of command and items="${errors.globalErrors}"

		<spring:hasBindErrors name="input">
				<c:forEach items="${errors.globalErrors}" var="errorMessage">
					<div id="errors" class="errors">
							<c:out value="${errorMessage.defaultMessage}" />
					</div>
				</c:forEach>
		</spring:hasBindErrors>

But now I have another issue -

I am trying to use the same page for another controller which is supposed to throw errors and this JSP should catch it. How am I supposed to show these errors?

	@RequestMapping(value = "/getPidProcessParams.do")
	public ModelAndView getPidProcessParams(HttpServletRequest request, HttpServletResponse response) {
		Input input = new Input();
		input.setPid(request.getParameter("pid"));
		request.getSession().removeAttribute("error");
		ModelMap map = new ModelMap("input", input);
		BindingResult errors = new BindException(input, "input");
		try {
			throw new Exception("Custom Error Message"); // service class throws errors
		} catch (Exception e) {
			errors.reject("error", new Object[] { e.getMessage() }, e.getMessage());
			map.put("command", errors.getModel());
			request.getSession().setAttribute("error", e.getMessage());
		}

		return new ModelAndView("editPidProcessParams", map); //same JSP page as discussed above
	}