Spring HttpServletRequest Stream closed IOException – Facebook api

I am trying to generate a JWT token for a user who has logged in with Facebook on the mobile app. I send the facebook data to this function:

@PostMapping("/facebook")
public void registerWithFacebook(@RequestBody User user, HttpServletRequest request, HttpServletResponse response){

    User loggingInUser = this.userRepository.findByUsername(user.getUsername());

    if( loggingInUser == null){
        user.setPassword(bCryptPasswordEncoder.encode(user.getPassword()));
        user.setBlocked(false);

        this.userRepository.save(user);
    }

    //Generate JWT token for user
    JWTAuthenticationFilter jwtAuthenticationFilter = new JWTAuthenticationFilter(this.authenticationManager, this.userRepository);
    jwtAuthenticationFilter.attemptAuthentication(request, response);
}

And I call the attemptAuthentication from my JWTAuthenticationFilter class:

public class JWTAuthenticationFilter extends 
UsernamePasswordAuthenticationFilter {

private AuthenticationManager authenticationManager;
private UserRepository userRepository;

public JWTAuthenticationFilter() {
}

public JWTAuthenticationFilter(AuthenticationManager authenticationManager, UserRepository userRepository) {
    this.authenticationManager = authenticationManager;
    this.userRepository = userRepository;
    setRequiresAuthenticationRequestMatcher(new AntPathRequestMatcher("/api/login", "POST"));
}

@Override
public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response)
        throws AuthenticationException {
    try {
        User creds = new ObjectMapper()
                .readValue(request.getInputStream(), User.class);

        return authenticationManager.authenticate(
                new UsernamePasswordAuthenticationToken(
                        creds.getUsername(),
                        creds.getPassword(),
                        new ArrayList<>())
        );
    } catch (IOException e) {
        throw new RuntimeException(e);
    }
}

@Override
protected void successfulAuthentication(HttpServletRequest request,
                                        HttpServletResponse response,
                                        FilterChain chain,
                                        Authentication authResult) throws IOException, ServletException {
    String token = Jwts.builder()
            .setSubject(((org.springframework.security.core.userdetails.User) authResult.getPrincipal()).getUsername())
            .setExpiration(new Date(System.currentTimeMillis() + SecurityConstants.EXPIRATION_TIME))
            .signWith(SignatureAlgorithm.HS512, SecurityConstants.JWT_SECRET.getBytes())
            .compact();
    response.addHeader(SecurityConstants.HEADER_STRING, token);

    String username = JWTAuthorizationFilter.getUsernameFromToken(token);
    User user = this.userRepository.findByUsername(username);

    Map<String, String> responseBody = new HashMap<>();
    responseBody.put("token", token);
    responseBody.put("blocked", Boolean.toString(user.isBlocked()));
    responseBody.put("paid", Boolean.toString(user.isPaid()));
    responseBody.put("endSubscription", user.getEndSubscribtionDate() + "");

    String jsonResponse = new ObjectMapper().writeValueAsString(responseBody);
    response.getWriter().write(jsonResponse);
}

}

But the attemptAuthentication method from JWTAuthenticationFilter class throws the following error: java.io.IOException: Stream closed in the following line of code :

 User creds = new ObjectMapper()
                .readValue(request.getInputStream(), User.class);

If I call the attemptAuthentication method through HTTP request, it works fine. What is or may be the problem that I get the stream closed exception ONLY when it is called from another class?

Thank you!