http-client-java, fix singular on caches (#10338)

"Caches" singular form should be "Cache"

Author: weidongxu-microsoft

.chronus/changes/http-client-java_fix-singular-on-caches-2026-3-10-16-19-20.md

@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@typespec/http-client-java"
+---
+
+Fix bug that singular form of "Caches" is incorrect

packages/http-client-java/generator/http-client-generator-mgmt/src/main/java/com/microsoft/typespec/http/client/generator/mgmt/util/Utils.java

@@ -44,6 +44,10 @@ public static String getNameForUngroupedOperations(Client client, FluentJavaSett
         return nameForUngroupOperations;
     }
 
+    static {
+        Pluralize.addSingularRule("caches", "cache");
+    }
+
     public static String getSingular(String name) {
         if (name == null) {
             return null;

packages/http-client-java/generator/http-client-generator-mgmt/src/test/java/com/microsoft/typespec/http/client/generator/mgmt/util/FluentUtilsTests.java

@@ -97,6 +97,9 @@ public void testGetSingular() {
         // irregular (children → child)
         Assertions.assertEquals("child", FluentUtils.getSingular("children"));
 
+        // require addSingularRule
+        Assertions.assertEquals("Cache", FluentUtils.getSingular("Caches"));
+
         // Azure resource style names
         Assertions.assertEquals("VirtualMachine", FluentUtils.getSingular("VirtualMachines"));
         Assertions.assertEquals("NetworkInterface", FluentUtils.getSingular("NetworkInterfaces"));