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https://issues.apache.org/jira/browse/FLINK-5549?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Timo Walther resolved FLINK-5549.
---------------------------------
Resolution: Fixed
Fix Version/s: 1.2.0
Fixed in 1.3.0: 2703d339abafdd9f39bc35faa1eed718501f71a7
Fixed in 1.2.0: 0a24611a865ae6e321016672c951a8a632363bd4
> TypeExtractor fails with RuntimeException, but should use GenericTypeInfo
> -------------------------------------------------------------------------
>
> Key: FLINK-5549
> URL: https://issues.apache.org/jira/browse/FLINK-5549
> Project: Flink
> Issue Type: Bug
> Components: Type Serialization System
> Affects Versions: 1.2.0
> Reporter: Robert Metzger
> Assignee: Timo Walther
> Fix For: 1.2.0
>
>
> This issue has been reported by a user on StackOverflow:
> http://stackoverflow.com/questions/41700568/runtimeexception-when-using-flinks-mapfunction-with-cassandra-insert-but-not
> {code}
> Exception in thread "main" java.lang.RuntimeException: The field private
> java.util.List com.datastax.driver.core.querybuilder.BuiltStatement.values is
> already contained in the hierarchy of the class
> com.datastax.driver.core.querybuilder.BuiltStatement.Please use unique field
> names through your classes hierarchy
> at
> org.apache.flink.api.java.typeutils.TypeExtractor.getAllDeclaredFields(TypeExtractor.java:1762)
> at
> org.apache.flink.api.java.typeutils.TypeExtractor.analyzePojo(TypeExtractor.java:1683)
> at
> org.apache.flink.api.java.typeutils.TypeExtractor.privateGetForClass(TypeExtractor.java:1580)
> at
> org.apache.flink.api.java.typeutils.TypeExtractor.privateGetForClass(TypeExtractor.java:1479)
> at
> org.apache.flink.api.java.typeutils.TypeExtractor.createTypeInfoWithTypeHierarchy(TypeExtractor.java:737)
> at
> org.apache.flink.api.java.typeutils.TypeExtractor.privateCreateTypeInfo(TypeExtractor.java:565)
> at
> org.apache.flink.api.java.typeutils.TypeExtractor.getUnaryOperatorReturnType(TypeExtractor.java:366)
> at
> org.apache.flink.api.java.typeutils.TypeExtractor.getUnaryOperatorReturnType(TypeExtractor.java:305)
> at
> org.apache.flink.api.java.typeutils.TypeExtractor.getMapReturnTypes(TypeExtractor.java:120)
> at
> org.apache.flink.streaming.api.datastream.DataStream.map(DataStream.java:506)
> at
> se.hiq.bjornper.testenv.cassandra.SOCassandraQueryTest.main(SOCassandraQueryTest.java:51)
> {code}
> When Flink is trying to analyze the POJO, the {{getAllDeclaredFields}} method
> fails with a RuntimeException. When the user is using a different class that
> contains the POJO, it just uses the GenericTypeInfo which is able to
> serialize the type.
> I think we need to throw a InvalidTypesException in the
> {{getAllDeclaredFields}} method to fix the issue
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