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 > >> > > > >
