当我想连接有这个问题“错误”：“内部服务器错误”，“消息”：“没有可用的消息”，[重复]

Posted 2023-02-27

【中文标题】当我想连接有这个问题“错误”：“内部服务器错误”，“消息”：“没有可用的消息”，[重复]

【英文标题】：when i want to connect have this problem "error": "Internal Server Error", "message": "No message available", [duplicate]

【发布时间】：2020-06-06 06:42:14

【问题描述】：

i have this code i can create a user i can get the username and password but i have an error when i want to connect

@PostMapping("/signin")

public ResponseEntity<?> authenticateUser(@Valid @RequestBody LoginRequest loginRequest) 

    System.out.println("a"+loginRequest.getUsername()+loginRequest.getPassword());
    Authentication authentication = authenticationManager.authenticate(
            new UsernamePasswordAuthenticationToken(loginRequest.getUsername(), loginRequest.getPassword()));
    System.out.println("a"+loginRequest.getUsername()+loginRequest.getPassword());
   // new RuntimeException("Error: cccccc is not found.");
    SecurityContextHolder.getContext().setAuthentication(authentication);
    String jwt = jwtUtils.generateJwtToken(authentication);
   new RuntimeException("Error: cccccc is not found."+ jwt);
    //    new RuntimeException("Error: cccccc is not found.");
    UserDetailslmpl userDetails = (UserDetailslmpl) authentication.getPrincipal();
    List<String> roles = userDetails.getAuthorities().stream()
            .map(item -> item.getAuthority())
            .collect(Collectors.toList());
   // new RuntimeException("Error: aaaa is not found.");
    return ResponseEntity.ok(new JwtResponse(jwt,
            userDetails.getId(),
            userDetails.getUsername(),
            userDetails.getEmail(),
            roles));

this is the error

the error on postman

【问题讨论】：

这只是一个 NullPointerException，看这里：***.com/questions/218384/…。

【参考方案1】：

正如 cmets 中所述，它是控制器中的 NullPointerException。 堆栈跟踪告诉您，在您的控制器的第 56 行中，恰好是

String jwt = jwtUtils.generateJwtToken(authentication);

jwtUtils 对象似乎为空。

【讨论】：

请不要在明显偏离主题/不好的问题上发布答案！ See: Should one advise on off topic questions?