(kafka) branch trunk updated: KAFKA-20638 Use Locale.ROOT in ConsumerGroupCommand.toLowerCase() (#22415)

[chia7712]

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The following commit(s) were added to refs/heads/trunk by this push:
     new 21340a4d138 KAFKA-20638 Use Locale.ROOT in 
ConsumerGroupCommand.toLowerCase() (#22415)
21340a4d138 is described below

commit 21340a4d1381ed3f388af2880b0e045b551a5a91
Author: Kenan Adel <160222053+kenana...@users.noreply.github.com>
AuthorDate: Sat May 30 06:54:03 2026 +0300

    KAFKA-20638 Use Locale.ROOT in ConsumerGroupCommand.toLowerCase() (#22415)
    
    Fixes a checkstyle violation by explicitly passing
    `java.util.Locale.ROOT` to `toLowerCase()` inside
    `ConsumerGroupCommand.consumerGroupTypesFromString()`.
    
    This ensures consistent behavior across different server locales.
    
    Reviewers: Chia-Ping Tsai <chia7...@gmail.com>
---
 .../org/apache/kafka/tools/consumer/group/ConsumerGroupCommand.java     | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git 
a/tools/src/main/java/org/apache/kafka/tools/consumer/group/ConsumerGroupCommand.java
 
b/tools/src/main/java/org/apache/kafka/tools/consumer/group/ConsumerGroupCommand.java
index 895ce1eaba1..f8705c9e7a4 100644
--- 
a/tools/src/main/java/org/apache/kafka/tools/consumer/group/ConsumerGroupCommand.java
+++ 
b/tools/src/main/java/org/apache/kafka/tools/consumer/group/ConsumerGroupCommand.java
@@ -164,7 +164,7 @@ public class ConsumerGroupCommand {
     @SuppressWarnings("Regexp")
     static Set<GroupType> consumerGroupTypesFromString(String input) {
         Set<GroupType> validTypes = Set.of(GroupType.CLASSIC, 
GroupType.CONSUMER);
-        Set<GroupType> parsedTypes = 
Stream.of(input.toLowerCase().split(",")).map(s -> 
GroupType.parse(s.trim())).collect(Collectors.toSet());
+        Set<GroupType> parsedTypes = 
Stream.of(input.toLowerCase(java.util.Locale.ROOT).split(",")).map(s -> 
GroupType.parse(s.trim())).collect(Collectors.toSet());
         if (!validTypes.containsAll(parsedTypes)) {
             throw new IllegalArgumentException("Invalid types list '" + input 
+ "'. Valid types are: " +
                 String.join(", ", 
validTypes.stream().map(GroupType::toString).collect(Collectors.toSet())));