@Override
	public boolean check() {
		Preconditions.checkNotNull(getType(), "kafka of type is required");
		Preconditions.checkNotNull(bootstrapServers, "kafka of bootstrapServers is required");
		Preconditions.checkNotNull(topic, "kafka of topic is required");
		return false;
	}
Reason:
Date: 2018/09/18
Company: www.dtstack.com
@author sishu.yss
kafka-base/kafka-base-source/src/main/java/com/dtstack/flink/sql/source/kafka/table/KafkaSourceTableInfo.java