kafka-connect-transform-common
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may be Should use ConcurrentHashMap instead of HashMap for cache?
https://github.com/jcustenborder/kafka-connect-transform-common/blob/9126c92bbea21e75046541d0f41f737bca8b27de/src/main/java/com/github/jcustenborder/kafka/connect/transform/common/ExtractNestedField.java#L50