ErrorsHandler.java

package pl.com.bottega.documentmanagement.controller;

import com.google.common.collect.Lists;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import pl.com.bottega.documentmanagement.api.AuthRequiredException;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * Created by maciuch on 09.07.16.
 */
@ControllerAdvice
public class ErrorsHandler {

    @ExceptionHandler(AuthRequiredException.class)
    public ResponseEntity<String> handleAuthRequiredException() {
        HttpHeaders headers = new HttpHeaders();
        headers.set(HttpHeaders.CONTENT_TYPE, "application/json");
        return new ResponseEntity<String>(
                "{'error': 'authentication_required'}",
                headers,
                HttpStatus.UNAUTHORIZED
        );
    }

}