chia7712 commented on a change in pull request #8665:
URL: https://github.com/apache/kafka/pull/8665#discussion_r425001861
##########
File path:
clients/src/main/java/org/apache/kafka/clients/consumer/KafkaConsumer.java
##########
@@ -1015,8 +1015,8 @@ public void subscribe(Collection<String> topics) {
@Override
public void subscribe(Pattern pattern, ConsumerRebalanceListener listener)
{
maybeThrowInvalidGroupIdException();
- if (pattern == null)
- throw new IllegalArgumentException("Topic pattern to subscribe to
cannot be null");
+ if (pattern == null || pattern.toString().equals(""))
+ throw new IllegalArgumentException("Topic pattern to subscribe to
cannot be " + pattern == null ? "null" : "empty");
Review comment:
the condition is always false if you don't add brackets.
```
throw new IllegalArgumentException("Topic pattern to subscribe to cannot be
" + (pattern == null ? "null" : "empty"));
```
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