Validator in spring MVC without configuration message properties file

Question

I have scenario like that.

1. I have jsp file, there are two field: toDate and fromDate:

<form:form id="testForm" modelAttribute="testForm" action="testAction">
    Name: <form:input path="name" />
    From date: <form:input path="fromDate" id="fromDate" />
    <form:errors path="fromDate" class="control-label" />
    To date: <form:input path="toDate" id="toDate" />
    <input id="mySubmitButton" type="submit" value="HELLO">
</form:form>

2. I have a Controller to handle request from my page as below:

@Autowired
   TestFormValidator validator;

@InitBinder
protected void initBinder(WebDataBinder binder) {
    binder.setValidator(validator);
}
@RequestMapping(value = "/testAction", method = RequestMethod.POST)
public String doSomeThing(ModelMap model,
        @ModelAttribute @Validated TestForm testForm, BindingResult result,
        RedirectAttributes redirectAttrs) {
    if (result != null && result.hasErrors()) {
        return "hello";
    }

3. I have Validator class to validate the TestForm:

@Component
public class TestFormValidator implements Validator {

@Override
public boolean supports(Class<?> clazz) {
    return TestForm.class.equals(clazz);
}

@Override
public void validate(Object arg0, Errors errors) {
    TestForm testForm = (TestForm) arg0;
    if (testForm.getFromDate() != null
            && testForm.getFromDate().after(testForm.toDate)) {
        errors.rejectValue("fromDate", "From date must not be after to date.");
    }

}

4. Yep, the following code is correct what I want. But I always meet the Exception:

org.springframework.context.NoSuchMessageException: No message found under code 'From date must not be after to date..testForm.fromDate' for locale...

5. I know that I miss declaration the bean: messageSource

My question:

I question whether are there any methods to return an error message without declaring message properties file?

Thanks in advance!!!

Answer 1

You can try Errors.rejectValue(String field, String errorCode, String defaultMessage) method. So your code must change as following.

errors.rejectValue("fromDate", "error.invalidFromDate", "From date must not be after to date.");

This should ideal use the defaultMessage in the scenario where it can't find the error code from message source.

Answer 2

You can also use this alternative.. The error message can be specified in the validation annotation, for example: @NotEmpty(message = "Please enter your email addresss.") private String email;

And for integer values @NotNull(message = "...".) Private Integer contactNumber

By doing this u can display error messages on your jsp page