Github user StefanRRichter commented on the issue:
https://github.com/apache/flink/pull/5950
Please also check the travis build, some related tests seem to fail:
Tests in error:
TypeSerializerSerializationUtilTest.testSerializerAndConfigPairsSerializationWithSerializerDeserializationFailures:236
û IO
TypeSerializerSerializationUtilTest.testSerializerSerializationWithClassNotFound:109
û IO
TypeSerializerSerializationUtilTest.testSerializerSerializationWithInvalidClass:149
û IO
PojoSerializerTest.testSerializerSerializationFailureResilience:570 û
IO
---