[jira] [Created] (FLINK-4645) Hard to register Kryo Serializers due to generics

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

Stephan Ewen created FLINK-4645:
-----------------------------------

             Summary: Hard to register Kryo Serializers due to generics
                 Key: FLINK-4645
                 URL: https://issues.apache.org/jira/browse/FLINK-4645
             Project: Flink
          Issue Type: Bug
          Components: Core
    Affects Versions: 1.1.2
            Reporter: Stephan Ewen
            Assignee: Stephan Ewen
             Fix For: 1.2.0


It currently does not work to do this:
{code}
env.registerTypeWithKryoSerializer(TreeMultimap.class, JavaSerializer.class);
{code}
instead on needs to do that:
{code}
env.registerTypeWithKryoSerializer(TreeMultimap.class, (Class<? extends Serializer<?>>) JavaSerializer.class);
{code}

The fix would be to change the signature of the environment method from
{code}
public void registerTypeWithKryoSerializer(Class<?> type, Class<? extends Serializer<?>> serializerClass)
{code}
to
{code}
public void registerTypeWithKryoSerializer(Class<?> type, Class<? extends Serializer> serializerClass)
{code}



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