Custom exception handling for Spring Boot

ControllerExceptionHandlingConfiguration.java

import java.io.IOException;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.Map;

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.context.request.WebRequest;
import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler;

import javax.servlet.http.HttpServletResponse;

@ControllerAdvice
public class GlobalControllerExceptionHandler {

      // Painfully add fields yourselve like DefaultErrorAttributes, ResponseEntityExceptionHandler
//    @ExceptionHandler(IllegalArgumentException.class)
//    public ResponseEntity<Map<String, Object>> illegalArgumentExceptionToBadRequest(
//            IllegalArgumentException e, WebRequest request) {
//        Map<String, Object> json = new LinkedHashMap<>();
//        json.put("timestamp", new Date());
//        json.put("status", HttpStatus.BAD_REQUEST);
//        json.put("exception", e.getClass());
//        json.put("message", e.getMessage());
//        return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(json);
//    }

  // Good links
  // https://www.toptal.com/java/spring-boot-rest-api-error-handling
  // https://gist.github.com/matsev/4519323
  
  // Solution taken from:
  // https://stackoverflow.com/questions/26236811/spring-boot-customize-http-error-response
    @ExceptionHandler
    void handleIllegalArgumentException(IllegalArgumentException e, HttpServletResponse response) throws IOException {
        response.sendError(HttpStatus.BAD_REQUEST.value());
    }
}