Flink No operators defined in streaming topology. Cannot execute.

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已于 2022-07-27 18:29:06 修改 · 3.9k 阅读

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#scala #java #开发语言

于 2022-07-27 18:27:39 首次发布

在执行Flink流处理程序时遇到异常，错误信息指出streamingtopology中未定义任何操作。当注释掉source.print()时，程序无法执行。这表明程序至少需要一个操作（如print）来启动数据流处理。

Exception in thread “main” java.lang.IllegalStateException: No operators defined in streaming topology. Cannot execute.

Exception in thread “main” java.lang.IllegalStateException: No operators defined in streaming topology. Cannot execute.
at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.getStreamGraphGenerator(StreamExecutionEnvironment.java:2000)
at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.getStreamGraph(StreamExecutionEnvironment.java:1991)
at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.getStreamGraph(StreamExecutionEnvironment.java:1976)
at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.execute(StreamExecutionEnvironment.java:1822)
at org.apache.flink.streaming.api.scala.StreamExecutionEnvironment.execute(StreamExecutionEnvironment.scala:746)
at com.ultrapower.realtime.test.MyTestScala$.main(MyTestScala.scala:18)
at com.ultrapower.realtime.tes