Hivemq high cpu usage

Hi everyone, im running Hivemq on amazon ec2 on container which has 1 cpu, 475 mb ram, 8.65 gb disk space. there i have 2 connections and total inbound publish messages are 319 and total outbound publish messages are 313. problem is that cpu is always on 100%, ram 150-200/475mb and dis space 3.70/8.65. can anyone help me identify why cpu always run on 100%?

im using my authentication extension

public class CustomAuthenticatorService implements SimpleAuthenticator {

private static final Logger logger = LoggerFactory.getLogger(CustomAuthenticatorService.class);
private final HttpClient httpClient = HttpClient.newHttpClient();

@Override
public void onConnect(@NotNull SimpleAuthInput simpleAuthInput, @NotNull SimpleAuthOutput simpleAuthOutput) {
    try {
        ConnectPacket connectPacket = simpleAuthInput.getConnectPacket();
        String clientId = connectPacket.getClientId();
        logger.info("Started authentication of device: " + clientId);

        if (connectPacket.getPassword().isEmpty()) {
            System.out.println("Authentication failed: invalid client credentials " + clientId);
            simpleAuthOutput.failAuthentication("Invalid Client credentials");
            return;
        }
        ByteBuffer readOnlyBuffer = connectPacket.getPassword().get().asReadOnlyBuffer();
        CharBuffer charBuffer = StandardCharsets.US_ASCII.decode(readOnlyBuffer);
        String text = charBuffer.toString();
        WashingDeviceAuthParam washingDeviceAuthParam = new WashingDeviceAuthParam(text, clientId);
        String jsonPayload = washingDeviceAuthParam.toJson();

        HttpRequest httpRequest = HttpRequest
                .newBuilder(URI.create("autentication endpoint"))
                .header("Content-Type", "application/json")
                .POST(HttpRequest.BodyPublishers.ofString(jsonPayload))
                .build();

        HttpResponse<String> httpResponse = httpClient.send(httpRequest, HttpResponse.BodyHandlers.ofString());

        if (httpResponse.statusCode() >= 200 && httpResponse.statusCode() <= 299 && httpResponse.body().equals("1")) {
            logger.info("Client successfully authenticated: " + clientId);
            simpleAuthOutput.authenticateSuccessfully();
        } else {
            logger.info("Client failed authentication: " + clientId);
            simpleAuthOutput.failAuthentication("Invalid credentials");
        }

    } catch (Exception exception) {
        logger.info("Client failed authentication: ");
        logger.info("Exception during authentication: " + exception);
        simpleAuthOutput.failAuthentication("Error during authentication");
    }
}

}