Kafka Producer窗口不允许我添加消息

Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
props.put("buffer.memory", "33554432"); // 设置缓冲区大小为32MB
props.put("acks", "all"); // 确保消息被所有副本接收
props.put("retries", 3); // 设置重试次数为3

KafkaProducer<String, String> producer = new KafkaProducer<>(props);

ProducerRecord<String, String> record = new ProducerRecord<>("my-topic", "key", "value");
producer.send(record);

producer.close();