我有下面这个方法。
jwtresponse是一个简单的pojo。
有人能解释一下为什么我在主题上有错误吗

ResponseEntity.ok(new JwtResponse...

如何修复？
谢谢

@PostMapping("/signin")
public ResponseEntity<?> authenticateUser(@Valid @RequestBody LoginRequest loginRequest) {

    Authentication authentication = authenticationManager.authenticate(
            new UsernamePasswordAuthenticationToken(loginRequest.getUsername(), loginRequest.getPassword()));

    SecurityContextHolder.getContext().setAuthentication(authentication);
    String jwt = jwtUtils.generateJwtToken(authentication);

    UserDetailsImpl userDetails = (UserDetailsImpl) authentication.getPrincipal();      
    List<String> roles = userDetails.getAuthorities().stream()
            .map(item -> item.getAuthority())
            .collect(Collectors.toList());

    return ResponseEntity.ok(new JwtResponse(jwt, 
                                             userDetails.getId(), 
                                             userDetails.getUsername(), 
                                             userDetails.getEmail(), 
                                             roles));
}