Adjust to blocking lower/uper-casing without locale.

Author: OlgaMaciaszek

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/EurekaDiscoveryClient.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2022 the original author or authors.
+ * Copyright 2013-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,6 +19,7 @@
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
+import java.util.Locale;
 
 import com.netflix.appinfo.InstanceInfo;
 import com.netflix.discovery.EurekaClient;
@@ -35,6 +36,7 @@
  *
  * @author Spencer Gibb
  * @author Tim Ysewyn
+ * @author Olga Maciaszek-Sharma
  */
 public class EurekaDiscoveryClient implements DiscoveryClient {
 
@@ -79,7 +81,7 @@ public List<String> getServices() {
 			if (app.getInstances().isEmpty()) {
 				continue;
 			}
-			names.add(app.getName().toLowerCase());
+			names.add(app.getName().toLowerCase(Locale.ROOT));
 
 		}
 		return names;

spring-cloud-netflix-eureka-server/src/main/java/org/springframework/cloud/netflix/eureka/server/EurekaServerConfigBean.java

@@ -19,6 +19,7 @@
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.Locale;
 import java.util.Map;
 import java.util.Objects;
 import java.util.Set;
@@ -234,7 +235,8 @@ public boolean shouldGZipContentFromRemoteRegion() {
 
 	@Override
 	public Set<String> getRemoteRegionAppWhitelist(String regionName) {
-		return this.remoteRegionAppWhitelist.get(regionName == null ? "global" : regionName.trim().toLowerCase());
+		return this.remoteRegionAppWhitelist
+			.get(regionName == null ? "global" : regionName.trim().toLowerCase(Locale.ROOT));
 	}
 
 	@Override

src/checkstyle/checkstyle-suppressions.xml

@@ -14,4 +14,8 @@
 <suppress files=".*TestAutoConfiguration\.java" checks="JavadocStyle"/>
 <suppress files=".*Tests\.java" checks="JavadocVariable"/>
 <suppress files=".*EurekaConfigServerBootstrapperIT\.java" checks="JavadocVariable"/>
+	<suppress files="[\\/]src[\\/](test|testFixtures)[\\/](java|java21)[\\/]"
+			  checks="RegexpSinglelineJava" id="toLowerCaseWithoutLocale"/>
+	<suppress files="[\\/]src[\\/](test|testFixtures)[\\/](java|java21)[\\/]"
+			  checks="RegexpSinglelineJava" id="toUpperCaseWithoutLocale"/>
 </suppressions>