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https://issues.apache.org/jira/browse/FLINK-7374?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Kricke closed FLINK-7374.
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Resolution: Fixed
> Type Erasure in GraphUtils$MapTo
> --------------------------------
>
> Key: FLINK-7374
> URL: https://issues.apache.org/jira/browse/FLINK-7374
> Project: Flink
> Issue Type: Bug
> Components: Gelly
> Affects Versions: 1.3.1
> Environment: Ubuntu 17.04
> java-8-oracle
> Reporter: Matthias Kricke
> Priority: Minor
>
> I got the following exception when executing ConnectedComponents or
> GSAConnectedComponents algorithm:
> {code:java}
> org.apache.flink.api.common.functions.InvalidTypesException: Type of
> TypeVariable 'O' in 'class org.apache.flink.graph.utils.GraphUtils$MapTo'
> 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).
> at
> org.apache.flink.api.java.typeutils.TypeExtractor.createTypeInfoWithTypeHierarchy(TypeExtractor.java:915)
> at
> org.apache.flink.api.java.typeutils.TypeExtractor.privateCreateTypeInfo(TypeExtractor.java:836)
> at
> org.apache.flink.api.java.typeutils.TypeExtractor.createTypeInfo(TypeExtractor.java:802)
> at org.apache.flink.graph.Graph.mapEdges(Graph.java:544)
> at
> org.apache.flink.graph.library.ConnectedComponents.run(ConnectedComponents.java:76)
> at
> org.apache.flink.graph.library.ConnectedComponents.run(ConnectedComponents.java:51)
> at org.apache.flink.graph.Graph.run(Graph.java:1792)
> {code}
> I copied code that is used to test the ConnectedComponents algorithm from
> flink/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/library/ConnectedComponentsWithRandomisedEdgesITCase.java
> to try it on another path, because my own code which converts a Gradoop
> Graph into a Gelly graph and executes the algorithm leads to the
> afformentioned exception.
> However, even the testcode gave me the exception.
> Any ideas?
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