java - 在 JSON 错误响应中包含异常消息

Question

如果电子邮件地址已经存在，则抛出异常并显示一条消息(“消息:”具有“+tempEmailId+”的用户已存在”)。我在 postman 中测试时没有收到异常消息。你能帮帮我吗? 问题出在哪里？

Controller 类:

@RestController
public class RegistrationController {

    @Autowired
    private RegistrationService service;
    
    @PostMapping("/registeruser")
    public  User registerUser(@RequestBody User user) throws Exception {
        
        String tempEmailId = user.getEmailId();
        if(tempEmailId !=null && !"".equals(tempEmailId)) {
            User userObject = service.fetchUserByEmailId(tempEmailId);
            if(userObject!=null) {
                throw new Exception("User with "+tempEmailId+" is already exist");
            }
        }
        User userObject = null;
        userObject = service.saveUser(user);
        return userObject;

    }
}

存储库:

public interface RegistrationRepository extends JpaRepository<User, Integer> {

    public User findByEmailId(String emailId);  // Here we declare 
}  

服务:

@Service

public class RegistrationService {

    @Autowired 
    private RegistrationRepository repo;
    
    public User saveUser(User user) {
        return repo.save(user);
    }
    
    public User fetchUserByEmailId(String email) { 
        return repo.findByEmailId(email);   
    }
}

Answer 1

如果您使用的是 Spring Boot 2.3 或更高版本，则属性 server.error.include-message 必须设置为 always:

引自Spring Boot 2.3 Release Notes :

Changes to the Default Error Page’s Content

The error message and any binding errors are no longer included in the default error page by default. This reduces the risk of leaking information to a client. server.error.include-message and server.error.include-binding-errors can be used to control the inclusion of the message and binding errors respectively. Supported values are always, on-param, and never.