luoyuxia commented on a change in pull request #16417:
URL: https://github.com/apache/flink/pull/16417#discussion_r666020950
##########
File path:
flink-connectors/flink-connector-kafka/src/main/java/org/apache/flink/streaming/connectors/kafka/internals/KafkaTopicsDescriptor.java
##########
@@ -51,8 +50,19 @@ public KafkaTopicsDescriptor(
checkArgument(
!fixedTopics.isEmpty(),
"If subscribing to a fixed topics list, the supplied list
cannot be empty.");
+ fixedTopics.forEach(
+ topic -> {
+ checkArgument(
+
!org.apache.flink.util.StringUtils.isNullOrWhitespaceOnly(topic),
Review comment:
Sorry for the misleading, we don't need to specific
org.apache.flink.util.StringUtils.isNullOrWhitespaceOnly, we can just import
org.apache.flink.util.StringUtils and use StringUtils.isNullOrWhitespaceOnly
here.
The reason we need to specific
org.apache.flink.util.StringUtils.isNullOrWhitespaceOnly in class
FlinkKafkaProducer.java is that we have imported
org.apache.commons.lang3.StringUtils.
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