[java] Throw error when using custom client config with local driver (#10219)

Author: pujagani

java/src/org/openqa/selenium/remote/RemoteWebDriverBuilder.java

@@ -126,6 +126,7 @@ public class RemoteWebDriverBuilder {
   private URI remoteHost = null;
   private DriverService driverService;
   private Credentials credentials = null;
+  private boolean useCustomConfig;
   private Augmenter augmenter = new Augmenter();
 
   RemoteWebDriverBuilder() {
@@ -273,6 +274,7 @@ public RemoteWebDriverBuilder config(ClientConfig config) {
     }
 
     this.clientConfig = config;
+    this.useCustomConfig = true;
 
     return this;
   }
@@ -336,7 +338,13 @@ WebDriver getLocalDriver() {
       throw new SessionNotCreatedException("Unable to find matching driver for capabilities");
     }
 
-    return first.get().get();
+    WebDriver localDriver = first.get().get();
+
+    if (localDriver != null && this.useCustomConfig) {
+      throw new IllegalArgumentException("Custom client config is not supported in local drivers");
+    }
+
+    return localDriver;
   }
 
   /**

java/test/org/openqa/selenium/remote/RemoteWebDriverBuilderTest.java

@@ -38,6 +38,7 @@
 import java.io.IOException;
 import java.net.URI;
 import java.net.URL;
+import java.time.Duration;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
@@ -304,6 +305,19 @@ public void shouldSetRemoteHostUriOnClientConfigIfSet() {
     assertThat(seen.get()).isEqualTo(uri);
   }
 
+  @Test
+  public void shouldThrowErrorIfCustomConfigIfSetForLocalDriver() {
+    ClientConfig config = ClientConfig.defaultConfig()
+      .connectionTimeout(Duration.ofMinutes(5))
+      .readTimeout(Duration.ofMinutes(4));
+
+    RemoteWebDriverBuilder builder = RemoteWebDriver.builder()
+      .oneOf(new FirefoxOptions())
+      .config(config);
+
+    assertThatExceptionOfType(IllegalArgumentException.class).isThrownBy(builder::build);
+  }
+
   @Test
   public void shouldSetSessionIdFromW3CResponse() {
     RemoteWebDriver driver = (RemoteWebDriver) RemoteWebDriver.builder()