ApiGatewayHandler.java

private static Gson gson = new GsonBuilder().setPrettyPrinting().create();
    private static SdkHttpClient sdkHttpClient = UrlConnectionHttpClient.create();
    private static DynamoDbClient client = DynamoDbClient.builder()
            .httpClient(sdkHttpClient)
            .region(Region.US_EAST_1)
            .credentialsProvider(EnvironmentVariableCredentialsProvider.create())
            .build();
    private static UserRepository userRepository = new DynamoDBUserRepository(client, gson);

    static {
        userRepository.get("invalidId");
    }