Fix KafkaItemReader ClassCastException during ExecutionContext deserialization #4863
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… Jackson2ExecutionContextStringSerializer Signed-off-by: Hyunwoo Jung <hyunwoojung@kakao.com>
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Using Jackson2ExecutionContextStringSerializer causes KafkaItemReader to throw a ClassCastException.
Because KafkaItemReader stores a Map<TopicPartition, Long> in the ExecutionContext, the serializer converts all map keys to strings.
To fix this, I changed it to store only the partition number (as a string) instead of the full TopicPartition object.
Resolves: #3797