diff --git a/sdk/spring/CHANGELOG.md b/sdk/spring/CHANGELOG.md
index 3a65e0f34f4d..a8286ac7814c 100644
--- a/sdk/spring/CHANGELOG.md
+++ b/sdk/spring/CHANGELOG.md
@@ -1,5 +1,14 @@
 # Release History
 
+## 6.2.0-beta.1 (Unreleased)
+
+### Spring Cloud Azure Autoconfigure
+This section includes changes in `spring-cloud-azure-autoconfigure` module.
+
+#### Bugs Fixed
+
+- Fix `ClassNotFoundException: com.nimbusds.oauth2.sdk.util.StringUtils` in Active Directory starter. ([#47600](https://github.com/Azure/azure-sdk-for-java/issues/47600))
+
 ## 6.1.0 (2025-12-16)
 - This release is compatible with Spring Boot 3.5.0-3.5.8. (Note: 3.5.x (x>8) should be supported, but they aren't tested with this release.)
 - This release is compatible with Spring Cloud 2025.0.0. (Note: 2025.0.x (x>0) should be supported, but they aren't tested with this release.)
diff --git a/sdk/spring/spring-cloud-azure-autoconfigure/src/main/java/com/azure/spring/cloud/autoconfigure/implementation/aad/security/properties/AadAuthorizationServerEndpoints.java b/sdk/spring/spring-cloud-azure-autoconfigure/src/main/java/com/azure/spring/cloud/autoconfigure/implementation/aad/security/properties/AadAuthorizationServerEndpoints.java
index ca5c53af3e44..d69733ee3c1f 100644
--- a/sdk/spring/spring-cloud-azure-autoconfigure/src/main/java/com/azure/spring/cloud/autoconfigure/implementation/aad/security/properties/AadAuthorizationServerEndpoints.java
+++ b/sdk/spring/spring-cloud-azure-autoconfigure/src/main/java/com/azure/spring/cloud/autoconfigure/implementation/aad/security/properties/AadAuthorizationServerEndpoints.java
@@ -3,7 +3,7 @@
 
 package com.azure.spring.cloud.autoconfigure.implementation.aad.security.properties;
 
-import com.nimbusds.oauth2.sdk.util.StringUtils;
+import org.springframework.util.StringUtils;
 
 /**
  * Used to get endpoints for Microsoft Identity authorization server.
@@ -27,7 +27,7 @@ public class AadAuthorizationServerEndpoints {
      * @param tenantId the tenant ID
      */
     public AadAuthorizationServerEndpoints(String baseUri, String tenantId) {
-        if (StringUtils.isBlank(baseUri)) {
+        if (!StringUtils.hasText(baseUri)) {
             baseUri = DEFAULT_BASE_URI;
         }
         this.baseUri = addSlash(baseUri);
diff --git a/sdk/spring/spring-cloud-azure-autoconfigure/src/test/java/com/azure/spring/cloud/autoconfigure/implementation/aad/security/properties/AadAuthorizationServerEndpointsTests.java b/sdk/spring/spring-cloud-azure-autoconfigure/src/test/java/com/azure/spring/cloud/autoconfigure/implementation/aad/security/properties/AadAuthorizationServerEndpointsTests.java
new file mode 100644
index 000000000000..08ea74dc0c98
--- /dev/null
+++ b/sdk/spring/spring-cloud-azure-autoconfigure/src/test/java/com/azure/spring/cloud/autoconfigure/implementation/aad/security/properties/AadAuthorizationServerEndpointsTests.java
@@ -0,0 +1,74 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+package com.azure.spring.cloud.autoconfigure.implementation.aad.security.properties;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class AadAuthorizationServerEndpointsTests {
+
+    private static final String DEFAULT_BASE_URI = "https://login.microsoftonline.com/";
+    private static final String CUSTOM_BASE_URI = "https://custom.endpoint.com/";
+    private static final String TENANT_ID = "test-tenant-id";
+
+    @Test
+    void constructorWithNullBaseUri() {
+        AadAuthorizationServerEndpoints endpoints = new AadAuthorizationServerEndpoints(null, TENANT_ID);
+        assertEquals(DEFAULT_BASE_URI, endpoints.getBaseUri());
+    }
+
+    @Test
+    void constructorWithEmptyBaseUri() {
+        AadAuthorizationServerEndpoints endpoints = new AadAuthorizationServerEndpoints("", TENANT_ID);
+        assertEquals(DEFAULT_BASE_URI, endpoints.getBaseUri());
+    }
+
+    @Test
+    void constructorWithWhitespaceBaseUri() {
+        AadAuthorizationServerEndpoints endpoints = new AadAuthorizationServerEndpoints("   ", TENANT_ID);
+        assertEquals(DEFAULT_BASE_URI, endpoints.getBaseUri());
+    }
+
+    @Test
+    void constructorWithValidBaseUri() {
+        AadAuthorizationServerEndpoints endpoints = new AadAuthorizationServerEndpoints(CUSTOM_BASE_URI, TENANT_ID);
+        assertEquals(CUSTOM_BASE_URI, endpoints.getBaseUri());
+    }
+
+    @Test
+    void constructorWithBaseUriWithoutTrailingSlash() {
+        String baseUriWithoutSlash = "https://custom.endpoint.com";
+        AadAuthorizationServerEndpoints endpoints = new AadAuthorizationServerEndpoints(baseUriWithoutSlash, TENANT_ID);
+        assertEquals(baseUriWithoutSlash + "/", endpoints.getBaseUri());
+    }
+
+    @Test
+    void getAuthorizationEndpoint() {
+        AadAuthorizationServerEndpoints endpoints = new AadAuthorizationServerEndpoints(DEFAULT_BASE_URI, TENANT_ID);
+        String authEndpoint = endpoints.getAuthorizationEndpoint();
+        assertEquals(DEFAULT_BASE_URI + TENANT_ID + "/oauth2/v2.0/authorize", authEndpoint);
+    }
+
+    @Test
+    void getTokenEndpoint() {
+        AadAuthorizationServerEndpoints endpoints = new AadAuthorizationServerEndpoints(DEFAULT_BASE_URI, TENANT_ID);
+        String tokenEndpoint = endpoints.getTokenEndpoint();
+        assertEquals(DEFAULT_BASE_URI + TENANT_ID + "/oauth2/v2.0/token", tokenEndpoint);
+    }
+
+    @Test
+    void getJwkSetEndpoint() {
+        AadAuthorizationServerEndpoints endpoints = new AadAuthorizationServerEndpoints(DEFAULT_BASE_URI, TENANT_ID);
+        String jwkSetEndpoint = endpoints.getJwkSetEndpoint();
+        assertEquals(DEFAULT_BASE_URI + TENANT_ID + "/discovery/v2.0/keys", jwkSetEndpoint);
+    }
+
+    @Test
+    void getEndSessionEndpoint() {
+        AadAuthorizationServerEndpoints endpoints = new AadAuthorizationServerEndpoints(DEFAULT_BASE_URI, TENANT_ID);
+        String endSessionEndpoint = endpoints.getEndSessionEndpoint();
+        assertEquals(DEFAULT_BASE_URI + TENANT_ID + "/oauth2/v2.0/logout", endSessionEndpoint);
+    }
+}