How do I customize default error message from spring @Valid validation?

Question

DTO:

public class User {

    @NotNull
    private String name;

    @NotNull
    private String password;

    //..
}

Controller:

Answer 1

Add some information too. If you use just @Valid, you need to catch BindException. If you use @Valid @RequestBody catch MethodArgumentNotValidException

Some sources:
HandlerMethodArgumentResolverComposite.getArgumentResolver(MethodParameter parameter):129 - search which HandlerMethodArgumentResolver support such parameter RequestResponseBodyMethodProcessor.supportsParameter(MethodParameter parameter) - return true if parameter has annotation @RequestBody

RequestResponseBodyMethodProcessor:139 - throw MethodArgumentNotValidException ModelAttributeMethodProcessor:164 - throw BindException