[jira] [Created] (FLINK-23158) Source transformation is not added to the StreamExecutionEnvironment explicitly

["Yun Gao (Jira)" <ji...@apache.org>]

Yun Gao created FLINK-23158:
-------------------------------

             Summary: 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


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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