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From Stephan Ewen <se...@apache.org>
Subject Re: Java 8 and keyBy in 1.0.0
Date Wed, 30 Mar 2016 09:30:39 GMT
Looks like something we should fix though. Probably just needs a case
distinction in the TypeExtractor.

@Andrew, can you post the stack trace into the me linked issue?

We'll try to get at it until the next release...

On Wed, Mar 30, 2016 at 10:58 AM, Chesnay Schepler <chesnay@apache.org>
wrote:

> 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:
>
> Hi,
>
> 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:
>
> Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: -1
> at
> 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?
>
>
> Thanks!
>
>
> Andrew
>
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