based on https://issues.apache.org/jira/browse/FLINK-3138 this is not supported for non-static methods.
On 30.03.2016 10:33, Andrew Ge Wu wrote:
This is not very obvious and looks like a bug.
I have a lambda expression to get key from objects in stream:
This works:stream.keyBy(value -> value.getId())
This does not:stream.keyBy(myClass::getId)
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: -1at org.apache.flink.api.java.typeutils.TypeExtractor.getUnaryOperatorReturnType(TypeExtractor.java:294)at org.apache.flink.api.java.typeutils.TypeExtractor.getKeySelectorTypes(TypeExtractor.java:253)at org.apache.flink.api.java.typeutils.TypeExtractor.getKeySelectorTypes(TypeExtractor.java:246)at org.apache.flink.streaming.api.datastream.KeyedStream.<init>(KeyedStream.java:87)at org.apache.flink.streaming.api.datastream.DataStream.keyBy(DataStream.java:241)
Can someone confirm this? or is there a better way to do it?
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