?????? STRING ??? ???? Java? ?? ??? ? ? ????.
Java? ??? ???? ?? producer.send(new KeyedMessage<String, HashMap<String, String>>(topic, message);
? ?? ???? ??? ??? ??? ??? ? ????. ??? ?? ??? ?????. ???? ??? ??????.
Exception in thread "Thread-4" java.lang.ClassCastException: java.util.HashMap can be Cast to java.lang.String
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