Problem:
I am trying to use as much Spring Boot Auto-configuration as possible to reduce boiler plate code. I cannot get the Spring Validation codes to automatically map to my externalized messages.properties. It will only work if I add my own LocalValidatorFactoryBean and use the fully qualified javax constraint message.
Goal
I want to override the defaultMessage for @javax.validation.constraints.NotNull globally in my application based on Spring Validation codes.
The first thing I did was register this bean...do I really have to? I see Spring Boot has one but it doesn't seem to correlate to messages.properties.
@Bean public LocalValidatorFactoryBean validator(MessageSource messageSource) { LocalValidatorFactoryBean bean = new LocalValidatorFactoryBean(); bean.setValidationMessageSource(messageSource); return bean; } The next one is surprising to me. Spring Validation has this nifty DefaultMessageCodesResolver that provides excellent code strategy for failures that look something like this:
"code": "NotNull", "codes": [ "NotNull.user.firstName", "NotNull.firstName", "NotNull.java.lang.String", "NotNull" ], But these codes aren't even considered for the @NotNull constraint. The spring documentation for Validation Conversion hints that something like this does exist but falls short of anything useful yet.
I wrote a sample application here and you can see that it's not working.
Question
How can I override the default message of Spring Validation errors based on those codes from messages.properties?
Relevant build.gradle
- springBootVersion = '2.0.0.RELEASE'
- compile('org.springframework.boot:spring-boot-starter-web')
src/main/resources/messages.properties:
NotNull.user.firstName=This doesn't work NotNull.firstName=Or this NotNull.java.lang.String=This doesn't work either NotNull=And this doesn't work javax.validation.constraints.NotNull.message=THIS DOES WORK! But why have codes then? Spring Auto-Configuration Output proving the auto-config loaded.
MessageSourceAutoConfiguration matched: - ResourceBundle found bundle URL [file:/home/szgaljic/git/jg-github/journey-through-spring/basic-web-validations/build/resources/main/messages.properties] (MessageSourceAutoConfiguration.ResourceBundleCondition) - @ConditionalOnMissingBean (types: org.springframework.context.MessageSource; SearchStrategy: current) did not find any beans (OnBeanCondition) Some other relevant start-up logs:
2018-03-26 14:32:22.970 TRACE 1093 --- [ main] o.s.beans.CachedIntrospectionResults : Found bean property 'validationMessageSource' of type [org.springframework.context.MessageSource] Validation Constraint:
public class User { @NotNull private String username; @NotNull private String firstName; } Controller just for Testing:
@RestController public class UserController { @PostMapping("/users") public List<ObjectError> testValidation(@Valid @RequestBody User user){ return null; // null implies no failed validations.. just for testing } } Failed to use the codes
I tried to comment/uncomment the messages in messages.properties but it will only take the value of javax.validation.constraints.NotNull.message.