java - 覆盖 DropWizard ConstraintViolation 消息

Question

So I want to change the validation messages used to validate a model through a DropWizard resource.

I'm using java bean validation annotations. For example here is one of the fields I want to validate:

@NotEmpty(message = "Password must not be empty.")

I can test this works as expected using a validator.

However when I use DropWizard to do the validation on the resource it adds some extra stuff to that message. What I see is this - password Password must not be empty. (was null) and I've found the code that does this here - https://github.com/dropwizard/dropwizard/blob/master/dropwizard-validation/src/main/java/io/dropwizard/validation/ConstraintViolations.java

Specifically this method -

public static <T> String format(ConstraintViolation<T> v) {
    if (v.getConstraintDescriptor().getAnnotation() instanceof ValidationMethod) {
        final ImmutableList<Path.Node> nodes = ImmutableList.copyOf(v.getPropertyPath());
        final ImmutableList<Path.Node> usefulNodes = nodes.subList(0, nodes.size() - 1);
        final String msg = v.getMessage().startsWith(".") ? "%s%s" : "%s %s";
        return String.format(msg,
                             Joiner.on('.').join(usefulNodes),
                             v.getMessage()).trim();
    } else {
        return String.format("%s %s (was %s)",
                             v.getPropertyPath(),
                             v.getMessage(),
                             v.getInvalidValue());
    }
}

Is there any way I can override this behaviour? I just want to display the message that I set in the annotation...

Answer 1

这是 dropwizard 0.8 中的程序化解决方案:

public void run(final MyConfiguration config, final Environment env) {
    AbstractServerFactory sf = (AbstractServerFactory) config.getServerFactory();
    // disable all default exception mappers
    sf.setRegisterDefaultExceptionMappers(false);
    // register your own ConstraintViolationException mapper
    env.jersey().register(MyConstraintViolationExceptionMapper.class)
    // restore other default exception mappers
    env.jersey().register(new LoggingExceptionMapper<Throwable>() {});
    env.jersey().register(new JsonProcessingExceptionMapper());
    env.jersey().register(new EarlyEofExceptionMapper());
} 

我认为它比配置文件更可靠。如您所见，它还支持所有其他 default exception mappers .