[jira] [Created] (FLINK-8499) Kryo must not be child-first loaded

["Stephan Ewen (JIRA)" <ji...@apache.org>]

Stephan Ewen created FLINK-8499:
-----------------------------------

             Summary: Kryo must not be child-first loaded
                 Key: FLINK-8499
                 URL: https://issues.apache.org/jira/browse/FLINK-8499
             Project: Flink
          Issue Type: Bug
          Components: Core
    Affects Versions: 1.4.0
            Reporter: Stephan Ewen
            Assignee: Stephan Ewen
             Fix For: 1.5.0, 1.4.1


Kryo classes are part of Flink API and hence move between Flink's core (serializers) and the user-application (Avro-Kryo-utils).

Duplicating the kryo dependency through reversed classloading yields problems. If Kryo is in the user application jar, together with Avro, the following error happens:

(this seems a semi-bug in the JVM, because this should clearly be a {{ClassCastException}}, not such a cryptic byte code error).

{code}
java.lang.VerifyError: Bad type on operand stack
Exception Details:
  Location:
    org/apache/flink/formats/avro/utils/AvroKryoSerializerUtils.addAvroGenericDataArrayRegistration(Ljava/util/LinkedHashMap;)V @23: invokespecial
  Reason:
    Type 'org/apache/flink/api/java/typeutils/runtime/kryo/Serializers$SpecificInstanceCollectionSerializerForArrayList' (current frame, stack[7]) is not assignable to 'com/esotericsoftware/kryo/Serializer'
  Current Frame:
    bci: @23
    flags: { }
    locals: { 'org/apache/flink/formats/avro/utils/AvroKryoSerializerUtils', 'java/util/LinkedHashMap' }
    stack: { 'java/util/LinkedHashMap', 'java/lang/String', uninitialized 6, uninitialized 6, 'java/lang/Class', uninitialized 12, uninitialized 12, 'org/apache/flink/api/java/typeutils/runtime/kryo/Serializers$SpecificInstanceCollectionSerializerForArrayList' }
  Bytecode:
    0x0000000: 2b12 05b6 000b bb00 0c59 1205 bb00 0d59
    0x0000010: bb00 0659 b700 0eb7 000f b700 10b6 0011
    0x0000020: 57b1                                   


{code}



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