spring-boot-rest/spring-boot-modules/spring-boot-data/src/main/java/com/baeldung/jsonexception/MainController.java

package com.baeldung.jsonexception;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

@Controller
public class MainController {

    @GetMapping("/")
    public void index() throws CustomException {
        throw new CustomException();
    }

}