Robert Metzger created FLINK-5549:
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Summary: TypeExtractor fails with RuntimeException, but should use GGenericTypeInfoeneric
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
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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