Spring MVC Hibernate Validator TypeMismatch Exception

I'm using Spring MVC with Hibernate validator 4.2.0. have a ValidationMessages.properties on my class path in /WEB-INF/classes/ValidationMessages.properties:

typeMismatch.java.lang.Integer=Must specify an integer value.
typeMismatch.int=Invalid number entered
typeMismatch=Invalid type entered

This is made available as a bean in javaconfig:

@Configuration
@EnableWebMvc
public class WebApplicationConfiguration extends WebMvcConfigurerAdapter {
...

@Bean
public ReloadableResourceBundleMessageSource messageSource() {
    ReloadableResourceBundleMessageSource resourceBundleMessageSource = new ReloadableResourceBundleMessageSource();
    resourceBundleMessageSource.setBasename("ValidationMessages");
    return resourceBundleMessageSource;
}
...

which is loading ValidationMessages.properties from the class path fine. My Controller:

@Controller
public class myController {
...

@InitBinder("myForm")
protected void initUserBinder(WebDataBinder binder) {
    binder.setValidator(new CustomValidator());
}
...

@ResponseBody
@RequestMapping(value = "/ajax/myRequest", method = RequestMethod.POST)
public CustomResponse ProcessAjaxRequest(
        @Valid @ModelAttribute final MyForm myForm,
        final BindingResult bindingResult)
                throws Exception {

    if (bindingResult.hasErrors()) {
        return new CustomResponse(bindingResult.getAllErrors());
    } else {
        ..
    }
}
...

And a custom validator:

public class CustomValidator implements Validator {

@Override
public boolean supports(Class c) {
    return MyForm.class.equals(c);
}

@Override
public void validate(Object obj, Errors errors) {
..

Validation with my CustomValidator works fine (I insert the error messages manually, not using the message source), however for binding typeMismatch errors I get the exception:

Failed to convert property value of type 'java.lang.String' to required type 'java.lang.Integer' for property 'myField'; nested exception is java.lang.NumberFormatException: For input string: "A"

rather than the code from ValidationMessages.properties, so it looks as though the DataBinder (?) is not using my messageSource. I want the typeMismatch codes from my properties file rather than the exception message. I have also tried with ResourceBundleMessageSource instead of ReloadableResourceBundleMessageSource but that didn't make any difference. Any ideas?

How do you get the error message? Is this work for you?

@Autowired
private MessageSource messageSource;
...

FieldError error = bindingResult.getFieldError("fieldName");
String errorMessage = messageSource.getMessage(error, Locale.getDefault());