[Spring-boot] ControllerAdvice exception class

package com.example.demo.exception;

import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.HashMap;
import java.util.Map;

/**
 * Anny's springboot exception class project
 */
@ControllerAdvice
public class MyControllerAdvice {

    /**
     * Global catch the exception class,
     * * Only acts on RequestMapping method, all exceptions are captured information
     * @Param ex
     * @return
     */
    @ResponseBody
    @ExceptionHandler(value = Exception.class)
    public Map<String,Object> errorHandler(Exception ex){
        Map<String,Object> map = new HashMap<>();
        map.put("code",-1);
        map.put("msg",ex.getMessage());
        return map;
    }

    /**
     * Custom exception
     * @Param ex
     * @return
     */
    @ResponseBody
    @ExceptionHandler(value = BusinessException.class)
    public Map<String,Object> errorBusinessHandler(BusinessException ex){
        Map<String,Object> map = new HashMap<>();
        map.put("code",ex.getCode());
        map.put("msg",ex.getMsg());
        return map;
    }

}

package com.example.demo.exception;

/**
 * Custom exception class
 */
public class BusinessException extends RuntimeException {

    private int code;
    private String msg;

    public BusinessException(int code, String msg) {
        super();
        this.code = code;
        this.msg = msg;
    }

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }
}

package com.example.demo.controller;

import com.example.demo.exception.BusinessException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;


@RestController
@RequestMapping("/hello")
public class HelloController {

    private  static Logger logger = LoggerFactory.getLogger (Hello Controller. class );

    @Value("${anny.msg}")
    private String msg;

    @RequestMapping ( "/ springBoot" )
     public String the Hello () {
         // abnormalities
 //         int NO = 1/0;
 //         return MSG;
         // custom exception 
        the throw  new new BusinessException (999999999, "what you see" );
    }
}