Stack overflow from self referencing Avro schema

[David Kim]

Hello all,

I'm running into a StackOverflowError using flink 1.0.0. I have an Avro
schema that has a self reference. For example:

item.avsc

{

  "namespace": "..."

  "type": "record"
  "name": "Item",
  "fields": [
    {
      "name": "parent"
      "type": ["null, "Item"]
    }
  ]
}


When running my flink job, I'm running into the follow error:

Exception in thread "Thread-94" java.lang.StackOverflowError
        at 
org.apache.flink.api.java.typeutils.TypeExtractor.countTypeInHierarchy(TypeExtractor.java:1105)
        at 
org.apache.flink.api.java.typeutils.TypeExtractor.privateGetForClass(TypeExtractor.java:1397)
        at 
org.apache.flink.api.java.typeutils.TypeExtractor.privateGetForClass(TypeExtractor.java:1319)
        at 
org.apache.flink.api.java.typeutils.TypeExtractor.createTypeInfoWithTypeHierarchy(TypeExtractor.java:609)
        at 
org.apache.flink.api.java.typeutils.TypeExtractor.analyzePojo(TypeExtractor.java:1531)
        at 
org.apache.flink.api.java.typeutils.AvroTypeInfo.generateFieldsFromAvroSchema(AvroTypeInfo.java:53)
        at 
org.apache.flink.api.java.typeutils.AvroTypeInfo.<init>(AvroTypeInfo.java:48)
        at 
org.apache.flink.api.java.typeutils.TypeExtractor.privateGetForClass(TypeExtractor.java:1394)
        at 
org.apache.flink.api.java.typeutils.TypeExtractor.privateGetForClass(TypeExtractor.java:1319)
        at 
org.apache.flink.api.java.typeutils.TypeExtractor.createTypeInfoWithTypeHierarchy(TypeExtractor.java:609)
        at 
org.apache.flink.api.java.typeutils.TypeExtractor.analyzePojo(TypeExtractor.java:1531)
        at 
org.apache.flink.api.java.typeutils.AvroTypeInfo.generateFieldsFromAvroSchema(AvroTypeInfo.java:53)
        at 
org.apache.flink.api.java.typeutils.AvroTypeInfo.<init>(AvroTypeInfo.java:48)
        at 
org.apache.flink.api.java.typeutils.TypeExtractor.privateGetForClass(TypeExtractor.java:1394)
        at 
org.apache.flink.api.java.typeutils.TypeExtractor.privateGetForClass(TypeExtractor.java:1319)
        at 
org.apache.flink.api.java.typeutils.TypeExtractor.createTypeInfoWithTypeHierarchy(TypeExtractor.java:609)
        at 
org.apache.flink.api.java.typeutils.TypeExtractor.analyzePojo(TypeExtractor.java:1531)
        at 
org.apache.flink.api.java.typeutils.AvroTypeInfo.generateFieldsFromAvroSchema(AvroTypeInfo.java:53)


Interestingly if I change the type to an Avro array in the schema, this
error is not thrown.

Thanks!
David