Spring: @ControllerAdvice & @ExceptionHandler

package io.jot.memento;


import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver;

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

@Configuration
public class Config{
  @Bean
  public ExceptionHandlerExceptionResolver exceptionHandlerExceptionResolver(){
    ExceptionHandlerExceptionResolver exceptionHandlerExceptionResolver = new ExceptionHandlerExceptionResolver();
    exceptionHandlerExceptionResolver.setMessageConverters(List.of(new MappingJackson2HttpMessageConverter()));
    return exceptionHandlerExceptionResolver;
  }

  @ControllerAdvice
  static class MyExceptionHandler{
    @ExceptionHandler
    @ResponseBody
    public Map<String, Object> exceptionHandler(Exception exception){
      return Map.of("error", exception.getMessage());
    }
  }
}

 

package io.jot.memento;


import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.mock.web.MockHttpServletRequest;
import org.springframework.mock.web.MockHttpServletResponse;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver;

import java.nio.charset.StandardCharsets;

public class Venal{
  public static void main(String[] args) throws NoSuchMethodException{
    AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(Config.class);
    ExceptionHandlerExceptionResolver exceptionResolver = context.getBean(ExceptionHandlerExceptionResolver.class);

    HandlerMethod handlerMethod = new HandlerMethod(new Controller(), Controller.class.getMethod("jot"));
    MockHttpServletRequest request = new MockHttpServletRequest();
    MockHttpServletResponse response = new MockHttpServletResponse();
    Exception exception = new Exception("error!!!!!!!");
    exceptionResolver.resolveException(request, response, handlerMethod, exception);
    System.out.println("\033[37;7m>>>>>> " + new String(response.getContentAsByteArray(), StandardCharsets.UTF_8) + " <<<<<<\033[0m");
  }

  static class Controller{
    public void jot(){
    }
  }
}