RocMarshal commented on a change in pull request #16417:
URL: https://github.com/apache/flink/pull/16417#discussion_r667566342
##########
File path:
flink-connectors/flink-connector-kafka/src/main/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaProducer.java
##########
@@ -647,8 +648,10 @@ private FlinkKafkaProducer(
new FlinkKafkaProducer.TransactionStateSerializer(),
new FlinkKafkaProducer.ContextStateSerializer());
- this.defaultTopicId = checkNotNull(defaultTopic, "defaultTopic is
null");
-
+ checkArgument(
+
!org.apache.flink.util.StringUtils.isNullOrWhitespaceOnly(defaultTopic),
Review comment:
What about `StringUtils#isNotBlank` of package
`org.apache.commons.lang3` ?
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