Spring MVC - @ExceptionHandler Examples

package com.logicbig.example;

import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.servlet.ModelAndView;
import jakarta.servlet.http.HttpServletRequest;
import java.time.Year;

@Controller
public class ExampleController {

    @RequestMapping("/data/{year}")
    @ResponseBody
    public String handleRequest(@PathVariable("year") int year) throws Exception {
        if (Year.of(year).isBefore(Year.of(1990))) {
            throw new Exception("Year is before 1990: " + year);
        }
        return "data response " + year;
    }

    @RequestMapping("/test/{id}")
    @ResponseBody
    public String handleRequest2(@PathVariable("id") String id) {
        int i = Integer.parseInt(id);
        return "test response " + i;
    }

    @RequestMapping("/admin")
    @ResponseBody
    public String handleRequest3(HttpServletRequest request)
            throws UserNotLoggedInException {

        Object user = request.getSession()
                             .getAttribute("user");
        if (user == null) {
            throw new UserNotLoggedInException("user: " + user);
        }
        return "test response " + user;
    }

    @ExceptionHandler(NumberFormatException.class)
    public ModelAndView exceptionHandler(NumberFormatException re) {
        ModelAndView mav = new ModelAndView("errorPage");
        mav.addObject("exception", re);
        return mav;
    }

    @ResponseStatus(HttpStatus.BAD_REQUEST)
    @ExceptionHandler(Exception.class)
    @ResponseBody
    public String exceptionHandler2(Exception re) {
        return "Exception: " + re.getMessage();
    }

    @ResponseStatus(HttpStatus.FORBIDDEN)
    @ExceptionHandler(UserNotLoggedInException.class)
    public ModelAndView exceptionHandler3(UserNotLoggedInException e) {
        ModelAndView mav = new ModelAndView("errorPage");
        mav.addObject("exception", e);
        return mav;
    }
}

package com.logicbig.example;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class ExampleController {

    /**
     * This will throw MissingPathVariableException with response code 500
     */
    @RequestMapping("/test/{id}")
    @ResponseBody
    public String handleRequest (@PathVariable("testId") String id) {
       return "id: "+id;
    }

    /**
     * The exception should be processed by @ExceptionHandler method
     */
    @RequestMapping("/test")
    public String handleRequest2 () throws Exception {
        throw new IllegalStateException();
    }


    @ExceptionHandler
    @ResponseBody
    public String handleException (IllegalStateException b) {
        return "from @ExceptionHandler method: " + b ;
    }
}