I have an controller that returns JSON. It takes a form, which validates itself via spring annotations. I can get FieldError list from BindingResult, but they don't contain the text that a JSP would display in the tag. How can I get the error text to send back in JSON?
@RequestMapping(method = RequestMethod.POST)
public
@ResponseBody
JSONResponse submit(@Valid AnswerForm answerForm, BindingResult result, Model model, HttpServletRequest request, HttpServletResponse response) {
if (result.hasErrors()) {
response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
JSONResponse r = new JSONResponse();
r.setStatus(JSONResponseStatus.ERROR);
//HOW DO I GET ERROR MESSAGES OUT OF BindingResult???
} else {
JSONResponse r = new JSONResponse();
r.setStatus(JSONResponseStatus.OK);
return r;
}
}
JSONREsponse class is just a POJO
public class JSONResponse implements Serializable {
private JSONResponseStatus status;
private String error;
private Map<String,String> errors;
private Map<String,Object> data;
...getters and setters...
}
Calling BindingResult.getAllErrors() returns an array of FieldError objects, but it doesn't have the actual errors.
Disclaimer: I still do not use Spring-MVC 3.0
But i think the same approach used by Spring 2.5 can fullfil your needs
for (Object object : bindingResult.getAllErrors()) {
if(object instanceof FieldError) {
FieldError fieldError = (FieldError) object;
System.out.println(fieldError.getCode());
}
if(object instanceof ObjectError) {
ObjectError objectError = (ObjectError) object;
System.out.println(objectError.getCode());
}
}
I hope it can be useful to you
UPDATE
If you want to get the message provided by your resource bundle, you need a registered messageSource instance (It must be called messageSource)
<bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
<property name="basenames" value="ValidationMessages"/>
</bean>
Inject your MessageSource instance inside your View
@Autowired
private MessageSource messageSource;
And to get your message, do as follows
for (Object object : bindingResult.getAllErrors()) {
if(object instanceof FieldError) {
FieldError fieldError = (FieldError) object;
/**
* Use null as second parameter if you do not use i18n (internationalization)
*/
String message = messageSource.getMessage(fieldError, null);
}
}
Your Validator should looks like
/**
* Use null as fourth parameter if you do not want a default message
*/
errors.rejectValue("<FIELD_NAME_GOES_HERE>", "answerform.questionId.invalid", new Object [] {"123"}, null);