TisonKun commented on issue #7570: [FLINK-11422] Prefer testing class to mock StreamTask in AbstractStre… URL: https://github.com/apache/flink/pull/7570#issuecomment-458400106 travis fails on ``` Submitting job ... 'test_write_as_text' 09:31:13.369 [ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 19.806 s <<< FAILURE! - in org.apache.flink.streaming.python.api.PythonStreamBinderTest 09:31:13.369 [ERROR] testProgram(org.apache.flink.streaming.python.api.PythonStreamBinderTest) Time elapsed: 12.26 s <<< ERROR! org.apache.flink.runtime.client.JobExecutionException: Job execution failed. at org.apache.flink.streaming.python.api.PythonStreamBinderTest.testProgram(PythonStreamBinderTest.java:81) Caused by: org.apache.flink.util.FlinkException: Python function failed: Traceback (most recent call last): File "/tmp/flink_streaming_plan_0e66d3bc-de26-4484-bdf1-5760fe3c795f/test_write_as_text.py", line 28, in flatMap collector.collect((1, value)) SystemError: __getattribute__ not found on type null. See http://bugs.jython.org/issue2487 for details. ``` I'm not sure if this is relevant @zentol
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