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https://issues.apache.org/jira/browse/FLINK-23158?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated FLINK-23158:
-----------------------------------
Labels: pull-request-available (was: )
> Source transformation is not added to the StreamExecutionEnvironment
> explicitly
> -------------------------------------------------------------------------------
>
> Key: FLINK-23158
> URL: https://issues.apache.org/jira/browse/FLINK-23158
> Project: Flink
> Issue Type: Bug
> Components: API / DataStream
> Affects Versions: 1.14.0
> Reporter: Yun Gao
> Priority: Major
> Labels: pull-request-available
>
> Currently for the implementation of `StreamExecutionEnvironment#fromSource()`
> and `StreamExecutionEnvironment#addSource()`, the SourceTransformation is not
> added to the transformation list explicitly, this make the job with a single
> source could not run directly. For example,
> {code:java}
> StreamExecutionEnvironment env =
> StreamExecutionEnvironment.getExecutionEnvironment();
> env.addSource(new SourceFunction<String>() {
> @Override
> public void run(SourceContext<String> sourceContext)
> throws Exception {
> }
> @Override
> public void cancel() {
> }
> });
> env.execute();
> {code}
> would throws the exception:
> {code:java}
> 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:2019)
> at
> org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.getStreamGraph(StreamExecutionEnvironment.java:2010)
> at
> org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.getStreamGraph(StreamExecutionEnvironment.java:1995)
> at
> org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.execute(StreamExecutionEnvironment.java:1834)
> at
> org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.execute(StreamExecutionEnvironment.java:1817)
> at test.SingleSourceTest.main(SingleSourceTest.java:41)
> {code}
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