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Matthias Kricke closed FLINK-7374. ---------------------------------- 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? -- This message was sent by Atlassian JIRA (v6.4.14#64029)