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
Confidentiality Notice: This e-mail transmission may contain
confidential or legally privileged information that is intended only
for the individual or entity named in the e-mail address. If you are
not the intended recipient, you are hereby notified that any
disclosure, copying, distribution, or reliance upon the contents of
this e-mail is strictly prohibited and may be unlawful. If you have
received this e-mail in error, please notify the sender immediately by
return e-mail and delete all copies of this message.
