gistfile1.txt

        StreamsBuilder builder = new StreamsBuilder();
        KStream<String, String> streamLeft = builder.stream("TopicIn1");
        KStream<String, String> streamRight = builder.stream("TopicIn2");

        KStream<String, String> joined = streamLeft.join(streamRight,
            (leftValue, rightValue) -> "left=" + leftValue + ", right=" + rightValue, /* ValueJoiner */
            JoinWindows.of(5000),
            Joined.with(
                Serdes.String(),  /* key */
                Serdes.String(),  /* left value */
                Serdes.String())  /* right value */
        );