最近，apache-flink的稳定版本(1.6.2(发布了。我读了这个说明书。但是当我运行以下命令时：
./bin/flink run examples/streaming/SocketWindowWordCount.jar --port 9000
我得到以下错误：
The program finished with the following exception:
org.apache.flink.client.program.ProgramInvocationException: Job failed. (JobID: 264564a337d4c6705bde681b34010d28)
at org.apache.flink.client.program.rest.RestClusterClient.submitJob(RestClusterClient.java:268)
at org.apache.flink.client.program.ClusterClient.run(ClusterClient.java:486)
at org.apache.flink.streaming.api.environment.StreamContextEnvironment.execute(StreamContextEnvironment.java:66)
at org.apache.flink.streaming.examples.socket.SocketWindowWordCount.main(SocketWindowWordCount.java:92)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:529)
at org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:421)
at org.apache.flink.client.program.ClusterClient.run(ClusterClient.java:426)
at org.apache.flink.client.cli.CliFrontend.executeProgram(CliFrontend.java:816)
at org.apache.flink.client.cli.CliFrontend.runProgram(CliFrontend.java:290)
at org.apache.flink.client.cli.CliFrontend.run(CliFrontend.java:216)
at org.apache.flink.client.cli.CliFrontend.parseParameters(CliFrontend.java:1053)
at org.apache.flink.client.cli.CliFrontend.lambda$main$11(CliFrontend.java:1129)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1836)
at org.apache.flink.runtime.security.HadoopSecurityContext.runSecured(HadoopSecurityContext.java:41)
at org.apache.flink.client.cli.CliFrontend.main(CliFrontend.java:1129)
Caused by: org.apache.flink.runtime.client.JobExecutionException: Job execution failed.
at org.apache.flink.runtime.jobmaster.JobResult.toJobExecutionResult(JobResult.java:146)
at org.apache.flink.client.program.rest.RestClusterClient.submitJob(RestClusterClient.java:265)
... 20 more
Caused by: java.net.ConnectException: Connection refused (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at org.apache.flink.streaming.api.functions.source.SocketTextStreamFunction.run(SocketTextStreamFunction.java:96)
at org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:94)
at org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:58)
at org.apache.flink.streaming.runtime.tasks.SourceStreamTask.run(SourceStreamTask.java:99)
at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:300)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:711)
at java.lang.Thread.run(Thread.java:748)
我发现了这个链接：当我关注Flink-1.4'；s快速启动并使用"/bin/flink run examples/streaming/SocketWindowWordCount.jar--port 9000"；。然而，这并没有起到任何作用。我在mac os和ubuntu上尝试了Flink 1.6.2 with Hadoop® 2.8和Flink 1.5.5 with Hadoop® 2.8。但我也犯了同样的错误。
对我来说很好。我能看到的唯一区别是，我使用的是没有hadoop的Flink版本，但我怀疑这是问题所在。
java.net.ConnectException: Connection refused通常意味着没有服务在端口9000上侦听。你应该通过在这个端口上运行netcat
$ nc -l 9000
(参见https://ci.apache.org/projects/flink/flink-docs-stable/quickstart/setup_quickstart.html#run-示例(。如果netcat正在运行，但它不工作，也许可以尝试另一个端口？检查所有日志文件以获取其他线索也可能有所帮助。
我通过阅读nc -h(在Linux中(：解决了这个烦人的问题
connect to somewhere: nc [-options] hostname port[s] [ports] ...
listen for inbound: nc -l -p port [-options] [hostname] [port]
因此，对于侦听端口，-p是必需的，我尝试了以下命令：
nc -l -p 9000
它奏效了。