What is the type of sessionId? It must be a key type in order to be used as key. If it is a generic class, it must implement Comparable to be used as key.
2016-02-09 11:53 GMT+01:00 Dominique Rondé <dominique.ro...@codecentric.de>: > The fields in SourceA and SourceB are private but have public getters and > setters. The classes provide an empty and public constructor. > Am 09.02.2016 11:47 schrieb "Chiwan Park" <chiwanp...@apache.org>: > >> Oh, the fields in SourceA have public getters. Does the fields in SourceA >> have public setter? SourceA needs public setter for private fields. >> >> Regards, >> Chiwan Park >> >> > On Feb 9, 2016, at 7:45 PM, Chiwan Park <chiwanp...@apache.org> wrote: >> > >> > Hi Dominique, >> > >> > It seems that `SourceA` is not dealt as POJO. Are all fields in SourceA >> public? There are some requirements for POJO classes [1]. >> > >> > [1]: >> https://ci.apache.org/projects/flink/flink-docs-release-0.10/apis/programming_guide.html#pojos >> > >> > Regards, >> > Chiwan Park >> > >> >> On Feb 9, 2016, at 7:42 PM, Dominique Rondé < >> dominique.ro...@codecentric.de> wrote: >> >> >> >> Hi folks, >> >> >> >> i try to join two datasets containing some PoJos. Each PoJo inherit a >> field "sessionId" from the parent class. The field is private but has a >> public getter. >> >> >> >> The join is like this: >> >> DataSet<Tuple2<SourceA,SourceB>> joinedDataSet = >> sourceA.join(SourceB).where("sessionId").equalTo("sessionId"); >> >> >> >> But the result is the following execption: >> >> >> >> Exception in thread "main" >> org.apache.flink.api.common.InvalidProgramException: This type >> (GenericType<x.y.z.service.eventstore.dto.SourceA>) cannot be used as key. >> >> at >> org.apache.flink.api.java.operators.Keys$ExpressionKeys.<init>(Keys.java:287) >> >> at >> org.apache.flink.api.java.operators.JoinOperator$JoinOperatorSets.where(JoinOperator.java:890) >> >> at >> x.y.z.eventstore.processing.pmc.PmcProcessor.main(PmcProcessor.java:55) >> >> >> >> I spend some time with google around but I don't get an idea what is >> wrong. I hope some of you can give me a hint... >> >> >> >> Greets >> >> Dominique >> >> >> > >> >>
