Return error if scopes set explicitly with databricks-cli auth

databricks-sdk-java/src/main/java/com/databricks/sdk/core/DatabricksCliCredentialsProvider.java

@@ -15,6 +15,10 @@ public class DatabricksCliCredentialsProvider implements CredentialsProvider {
 
   public static final String DATABRICKS_CLI = "databricks-cli";
 
+  static final String ERR_CUSTOM_SCOPES_NOT_SUPPORTED =
+      "custom scopes are not supported with databricks-cli auth; "
+          + "scopes are determined by what was last used when logging in with `databricks auth login`";
+
   @Override
   public String authType() {
     return DATABRICKS_CLI;
@@ -74,6 +78,10 @@ public OAuthHeaderFactory configure(DatabricksConfig config) {
         return null;
       }
 
+      if (config.isScopesExplicitlySet()) {
+        throw new DatabricksException(ERR_CUSTOM_SCOPES_NOT_SUPPORTED);
+      }
+
       CachedTokenSource cachedTokenSource =
           new CachedTokenSource.Builder(tokenSource)
               .setAsyncDisabled(config.getDisableAsyncTokenRefresh())

databricks-sdk-java/src/main/java/com/databricks/sdk/core/DatabricksConfig.java

@@ -50,6 +50,12 @@ public class DatabricksConfig {
   @ConfigAttribute(auth = "oauth")
   private List<String> scopes;
 
+  // Temporary field to track if scopes were explicitly set by the user.
+  // This is used to ensure users don't set explicit scopes when using 
+  // `databricks-cli` auth, as it does not respect the scopes.
+  // TODO: Remove this field once the `auth token` command supports scopes.
+  private boolean scopesExplicitlySet = false;
+
   @ConfigAttribute(env = "DATABRICKS_REDIRECT_URL", auth = "oauth")
   private String redirectUrl;
 
@@ -430,9 +436,14 @@ public List<String> getScopes() {
 
   public DatabricksConfig setScopes(List<String> scopes) {
     this.scopes = scopes;
+    this.scopesExplicitlySet = true;
     return this;
   }
 
+  public boolean isScopesExplicitlySet() {
+    return scopesExplicitlySet;
+  }
+
   public String getProfile() {
     return profile;
   }

databricks-sdk-java/src/test/java/com/databricks/sdk/core/DatabricksCliCredentialsProviderTest.java

@@ -1,5 +1,6 @@
 package com.databricks.sdk.core;
 
+import static com.databricks.sdk.core.DatabricksCliCredentialsProvider.ERR_CUSTOM_SCOPES_NOT_SUPPORTED;
 import static org.junit.jupiter.api.Assertions.*;
 
 import java.util.Arrays;
@@ -139,4 +140,50 @@ void testBuildCliCommand_UnifiedHostFalse_WithAccountHost() {
             CLI_PATH, "auth", "token", "--host", ACCOUNT_HOST, "--account-id", ACCOUNT_ID),
         cmd);
   }
+
+  @Test
+  void testConfigure_ErrorsWhenScopesExplicitlySet() {
+    DatabricksConfig config =
+        new DatabricksConfig()
+            .setHost(HOST)
+            .setDatabricksCliPath(CLI_PATH)
+            .setScopes(Arrays.asList("sql"));
+
+    DatabricksException e =
+        assertThrows(DatabricksException.class, () -> provider.configure(config));
+    assertEquals(ERR_CUSTOM_SCOPES_NOT_SUPPORTED, e.getMessage());
+  }
+
+  @Test
+  void testConfigure_SkipsWhenCliNotFoundEvenWithScopes() {
+    // When CLI is not available, the provider should return null (skip)
+    // rather than throwing an error about scopes.
+    DatabricksConfig config =
+        new DatabricksConfig()
+            .setHost(HOST)
+            .setScopes(Arrays.asList("sql"));
+
+    assertNull(provider.configure(config));
+  }
+
+  @Test
+  void testConfigure_NoErrorWhenNoScopes() {
+    DatabricksConfig config = new DatabricksConfig().setHost(HOST);
+
+    try {
+      provider.configure(config);
+    } catch (Exception e) {
+      // May fail for other reasons (CLI not found, env not set), but must not be the scope error
+      assertNotEquals(ERR_CUSTOM_SCOPES_NOT_SUPPORTED, e.getMessage());
+    }
+  }
+
+  @Test
+  void testScopesExplicitlySetFlag() {
+    DatabricksConfig config = new DatabricksConfig();
+    assertFalse(config.isScopesExplicitlySet());
+
+    config.setScopes(Arrays.asList("sql", "clusters"));
+    assertTrue(config.isScopesExplicitlySet());
+  }
 }