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https://issues.apache.org/jira/browse/FLINK-1962?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14530519#comment-14530519
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PJ Van Aeken commented on FLINK-1962:
-------------------------------------
Here's what I have so far in terms of wrapping the Java API:
https://github.com/PieterJanVanAeken/flink/tree/master/flink-staging/flink-gelly-scala/src/main/scala/org/apache/flink/graph/wrappedjava
Two things that bother me:
1. It doesn't work ;-) This is the error that is thrown:
"org.apache.flink.api.common.functions.InvalidTypesException: Type of
TypeVariable 'K' in 'class org.apache.flink.graph.Vertex' could not be
determined. This is most likely a type erasure problem. The type extraction
currently supports types with generic variables only in cases where all
variables in the return type can be deduced from the input type(s)."
2. The JLong is not very user-friendly, but this is something that can be fixed
automatically if the Serializable constraint can be dropped. Implicit
conversions to Ordered should take care of the "Comparable" constraint.
I think once we've eliminated these issues, I can start implementing a lot of
the functionalities again without any problems. There are some very good
examples in the code base already to do this.
> Add Gelly Scala API
> -------------------
>
> Key: FLINK-1962
> URL: https://issues.apache.org/jira/browse/FLINK-1962
> Project: Flink
> Issue Type: Task
> Components: Gelly, Scala API
> Affects Versions: 0.9
> Reporter: Vasia Kalavri
>
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