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我正尝试使用Java程序从本地系统连接到Spark主节点（远程群集节点）。我正在使用以下API连接：远程连接到Spark群集
SparkConf conf = new SparkConf().setAppName("WorkCountApp").setMaster("spark://masterIP:7077");
JavaSparkContext sc = new JavaSparkContext(conf);
我的程序尝试连接到主设备，但一段时间后失败。下面是堆栈跟踪：
16/11/30 17:40:26 INFO AppClient$ClientActor: Connecting to master akka.tcp://[email protected]:7077/user/Master...
16/11/30 17:40:46 ERROR SparkDeploySchedulerBackend: Application has been killed. Reason: All masters are unresponsive! Giving up.
16/11/30 17:40:46 WARN SparkDeploySchedulerBackend: Application ID is not initialized yet.
16/11/30 17:40:46 INFO SparkUI: Stopped Spark web UI at http://172.31.11.1:4040
16/11/30 17:40:46 INFO DAGScheduler: Stopping DAGScheduler
16/11/30 17:40:46 INFO SparkDeploySchedulerBackend: Shutting down all executors
16/11/30 17:40:46 INFO SparkDeploySchedulerBackend: Asking each executor to shut down
16/11/30 17:40:46 ERROR OneForOneStrategy:
java.lang.NullPointerException
java.lang.IllegalStateException: Cannot call methods on a stopped SparkContext
at org.apache.spark.SparkContext.org$apache$spark$SparkContext$$assertNotStopped(SparkContext.scala:103)
请帮我用同样