Spring MVC makes form validation a lot easier using Spring's Validator framework. You might have noticed the @Valid annotation and the usage of the BindingResult.hasErrors() method call inside handler methods listed in the previous section. They are part of the validation framework.
Let's create a validator for a Task object by following these steps:
Add the Validation API's Maven dependency,
javax.validation(build file:pom.xml).Make sure you have defined
MessageSourceBeanfor thevalidation-errorsproperties file in your bean definition:<beans:bean id="messageSource" class="org.springframework.context. support.ReloadableResourceBundleMessageSource"> <beans:property name="defaultEncoding" value="UTF-8" /> <beans:property name="basenames" value="classpath:validation-errors" /> </beans:bean>
Make sure there is a
validation-errors.propertiesfile with the following sample content in your root resources location. You may add as many error messages...