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https://issues.apache.org/jira/browse/FLINK-1360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14267927#comment-14267927
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Stephan Ewen commented on FLINK-1360:
-------------------------------------
Is this issue resolved [~Felix Neutatz] ?
I think it turned out not to be a bug, but something that is fundamentally not
supported in the Java Type Extraction on Elements.
> Automatic type extraction for Void is missing
> ---------------------------------------------
>
> Key: FLINK-1360
> URL: https://issues.apache.org/jira/browse/FLINK-1360
> Project: Flink
> Issue Type: Bug
> Reporter: Felix Neutatz
> Priority: Minor
>
> DataSet<Tuple2<Void,Long>> data = env.fromElements(new
> Tuple2<Void,Long>(null, 1L));
> data.print();
> throws the following exception:
> Exception in thread "main"
> org.apache.flink.api.common.functions.InvalidTypesException: Automatic type
> extraction is not possible on candidates with null values. Please specify the
> types directly.
> at
> org.apache.flink.api.java.typeutils.TypeExtractor.privateGetForObject(TypeExtractor.java:1174)
> at
> org.apache.flink.api.java.typeutils.TypeExtractor.getForObject(TypeExtractor.java:1152)
> at
> org.apache.flink.api.java.ExecutionEnvironment.fromElements(ExecutionEnvironment.java:540)
> at
> org.apache.flink.hadoopcompatibility.mapreduce.example.ParquetOutput.main(ParquetOutput.java:58)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
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