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https://issues.apache.org/jira/browse/FLINK-14809?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Kostas Kloudas reassigned FLINK-14809:
--------------------------------------
Assignee: Kostas Kloudas
> DataStreamAllroundTestProgram does not run because return types cannot be
> determined
> ------------------------------------------------------------------------------------
>
> Key: FLINK-14809
> URL: https://issues.apache.org/jira/browse/FLINK-14809
> Project: Flink
> Issue Type: Bug
> Components: API / DataStream, Tests
> Affects Versions: 1.10.0
> Reporter: Gary Yao
> Assignee: Kostas Kloudas
> Priority: Blocker
> Fix For: 1.10.0
>
>
> {noformat}
> 2019-11-14 19:34:55,185 ERROR org.apache.flink.client.cli.CliFrontend
> - Error while running the command.
> org.apache.flink.client.program.ProgramInvocationException: The main method
> caused an error: The return type of function
> 'main(DataStreamAllroundTestProgram.java:182)' could not be determined
> automatically, due to type erasure. You can give type information hints by
> using the returns(...) method on the result of the transformation call, or by
> letting your function implement the 'ResultTypeQueryable' interface.
> at
> org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:336)
> at
> org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:206)
> at
> org.apache.flink.client.ClientUtils.executeProgram(ClientUtils.java:173)
> at
> org.apache.flink.client.cli.CliFrontend.executeProgram(CliFrontend.java:747)
> at
> org.apache.flink.client.cli.CliFrontend.runProgram(CliFrontend.java:282)
> at org.apache.flink.client.cli.CliFrontend.run(CliFrontend.java:219)
> at
> org.apache.flink.client.cli.CliFrontend.parseParameters(CliFrontend.java:1011)
> at
> org.apache.flink.client.cli.CliFrontend.lambda$main$10(CliFrontend.java:1084)
> 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:1084)
> Caused by: org.apache.flink.api.common.functions.InvalidTypesException: The
> return type of function 'main(DataStreamAllroundTestProgram.java:182)' could
> not be determined automatically, due to type erasure. You can give type
> information hints by using the returns(...) method on the result of the
> transformation call, or by letting your function implement the
> 'ResultTypeQueryable' interface.
> at
> org.apache.flink.api.dag.Transformation.getOutputType(Transformation.java:412)
> at
> org.apache.flink.streaming.api.datastream.DataStream.addSink(DataStream.java:1296)
> at
> org.apache.flink.streaming.tests.DataStreamAllroundTestProgram.main(DataStreamAllroundTestProgram.java:185)
> 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:322)
> ... 12 more
> Caused by: org.apache.flink.api.common.functions.InvalidTypesException: Input
> mismatch: Generic type 'org.apache.flink.streaming.tests.Event' or a subclass
> of it expected but was 'org.apache.flink.streaming.tests.Event'.
> at
> org.apache.flink.api.java.typeutils.TypeExtractor.validateInputType(TypeExtractor.java:1298)
> at
> org.apache.flink.api.java.typeutils.TypeExtractor.getUnaryOperatorReturnType(TypeExtractor.java:585)
> at
> org.apache.flink.api.java.typeutils.TypeExtractor.getFlatMapReturnTypes(TypeExtractor.java:196)
> at
> org.apache.flink.streaming.api.datastream.DataStream.flatMap(DataStream.java:634)
> at
> org.apache.flink.streaming.tests.DataStreamAllroundTestProgram.main(DataStreamAllroundTestProgram.java:182)
> ... 17 more
> Caused by: org.apache.flink.api.common.functions.InvalidTypesException:
> Generic type 'org.apache.flink.streaming.tests.Event' or a subclass of it
> expected but was 'org.apache.flink.streaming.tests.Event'.
> at
> org.apache.flink.api.java.typeutils.TypeExtractor.validateInfo(TypeExtractor.java:1481)
> at
> org.apache.flink.api.java.typeutils.TypeExtractor.validateInfo(TypeExtractor.java:1491)
> at
> org.apache.flink.api.java.typeutils.TypeExtractor.validateInputType(TypeExtractor.java:1295)
> ... 21 more
> {noformat}
> This happens in multiple nightlies and jepsen runs. Example
> https://api.travis-ci.org/v3/job/611848582/log.txt
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