使用Spotify API将Docker映像推送到Docker Hub-JAVA

Question

我有一个预构建的docker映像，标记为sajitha：newcontainer 。 现在，我想以编程方式将此构建的docker映像推送到Docker Hub。 我已经使用以下代码段来做到这一点。

DockerClient docker = DefaultDockerClient.builder().uri("unix:///var/run/docker.sock").build();

// Test connection to Docker server
try {
     docker.ping();
} catch (DockerException | InterruptedException e1) {
     log.error(DockerProjectConstants.DOCKER_CONNECTION_FAILED_MESSAGE, e1);
}

final RegistryAuth registryAuth = RegistryAuth.builder()
                  .email(Contant.AUTH_EMAIL)
                  .username(Contant.AUTH_USERNAME)
                  .password(Contant.AUTH_PASSWORD)
                  .build();
try {
    final int statusCode = docker.auth(registryAuth);
    log.info("AUTH status code -" +  statusCode);
    if (statusCode == 200) {
        docker.push("sajitha:newcontainer:", registryAuth);     
        log.info("PUSHED.......");
    } else {
        log.info("ERORRRRRRRRRRR");
    }

} catch (DockerException | InterruptedException e2) {
       log.error("Pushing failed!", e2);
}

但是当我运行此命令时，Spotify API会返回如下错误，

错误=拒绝：请求的对资源的访问被拒绝

com.spotify.docker.client.exceptions.ImagePushFailedException: Image push failed: sajitha:newcontainer: ProgressMessage{id=null, status=null, stream=null, error=denied: requested access to the resource is denied, progress=null, progressDetail=null}
    at com.spotify.docker.client.LoggingPushHandler.progress(LoggingPushHandler.java:43)
    at com.spotify.docker.client.ProgressStream.tail(ProgressStream.java:77)
    at com.spotify.docker.client.DefaultDockerClient$ResponseTailReader.call(DefaultDockerClient.java:2749)
    at com.spotify.docker.client.DefaultDockerClient$ResponseTailReader.call(DefaultDockerClient.java:2733)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

我该如何做而没有任何错误？ 我只是想将构建的docker映像推送到docker hub。