Validation Error format in spring boot with Message Resource

Question

i'm trying to get a well-formatted validation error message from message resource.

Expected: username can't be empty What I get: can't be empty. validation_en.properties :

NotEmpty=can't be empty

messages_en.properties

username=Username

My Class

    @Value
public class LoginForm{
    @NotEmpty
    private final String username;
...

Configuration Class:

    @Configuration
public class WebAdaptorConfiguration implements WebMvcConfigurer {
    @Bean
    public MessageSource messageSource() {
        ResourceBundleMessageSource resource =
                new ResourceBundleMessageSource();
        resource.setBasenames("messages","validation");
        resource.setDefaultEncoding("utf-8");
        return resource;
    }

    @Bean
    public LocaleResolver localeResolver() {
        SessionLocaleResolver sessionLocaleResolver = new SessionLocaleResolver();
        sessionLocaleResolver.setDefaultLocale(new Locale("fa"));
        return sessionLocaleResolver;
    }
    @Bean
    public LocalValidatorFactoryBean getValidator() {
        LocalValidatorFactoryBean bean = new LocalValidatorFactoryBean();
        bean.setValidationMessageSource(messageSource());
        return bean;
    }

}

View:

<label th:if="${#fields.hasErrors('username')}" th:errors="*{username}"
                        class="validation-message"></label>

drumonii · Accepted Answer · 2020-03-29 03:17:04Z

0

You've specified the default message for the @NotEmpty constraint to always be 'can't be empty'.

In order to use your custom message for the @NotEmpty constraint specifically validating the username field in your LoginForm, you need to follow the message property naming convention:

Constraint.formName.propertyName

So in your case, the message property for your username property becomes NotEmpty.loginForm.username=username can't be empty

I couldn't find any reference to that convention in the Hibernate validator docs or Spring docs but this article also explains it - https://www.codejava.net/frameworks/spring/spring-mvc-form-validation-example-with-bean-validation-api

answered Mar 29, 2020 at 3:17

drumonii

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2 Comments

I'mDoneOK Over a year ago

I want to avoid this kind of redundancy,if i have n fields and m error types with my way i should write n+m lines but as you say it becomes n*m

drumonii Over a year ago

You're right, it certainly would become repetitive. Unfortunately, to my knowledge at least, it has to be like that in order narrow it down to a specific form, which was your original question. Now, you do have the option of making it so all @NotEmpty validated username fields can have the same validation message: NotEmpty.username=username can't be empty

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