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 >> >
