http://www.dropwizard.io/1.3.16/dropwizard-jersey: Dropwizard is a Java framework for developing ops-friendly, high-performance, RESTful web applications.
  • Coda Hale
  • Nick Telford
  • Graham O'Regan
  • Ryan Kennedy
  • Camille Fournier
  • Carlo Barbara
  • Matt Veitas
  • Ryan Tenney
  • Jochen Schalanda
  • Glenn McAllister
  • Nick Babcock
  • Justin Plock
  • Artem Prigoda 
package io.dropwizard.jersey.validation;

import com.google.common.collect.FluentIterable;
import com.google.common.collect.ImmutableList;
import org.glassfish.jersey.server.model.Invocable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.validation.ConstraintViolation;
import javax.ws.rs.core.Response;
import javax.ws.rs.ext.ExceptionMapper;
import javax.ws.rs.ext.Provider;
import java.util.Set;

@Provider
public class JerseyViolationExceptionMapper implements ExceptionMapper<JerseyViolationException> {
    private static final Logger LOGGER = LoggerFactory.getLogger(JerseyViolationExceptionMapper.class);

    @Override
    public Response toResponse(final JerseyViolationException exception) {
        // Provide a way to log if desired, Issue #2128, PR #2129
        LOGGER.debug("Object validation failure", exception);

        final Set<ConstraintViolation<?>> violations = exception.getConstraintViolations();
        final Invocable invocable = exception.getInvocable();
        final ImmutableList<String> errors = FluentIterable.from(exception.getConstraintViolations())
                .transform(violation -> ConstraintMessage.getMessage(violation, invocable)).toList();

        final int status = ConstraintMessage.determineStatus(violations, invocable);
        return Response.status(status)
                .entity(new ValidationErrorMessage(errors))
                .build();
    }
}