[java] make the signature change in ExecuteMethod backward compatible

java/src/org/openqa/selenium/chromium/AddHasCasting.java

@@ -18,7 +18,6 @@
 package org.openqa.selenium.chromium;
 
 import static java.util.Collections.emptyList;
-import static java.util.Objects.requireNonNullElse;
 
 import java.util.List;
 import java.util.Map;
@@ -56,7 +55,7 @@ public HasCasting getImplementation(Capabilities capabilities, ExecuteMethod exe
     return new HasCasting() {
       @Override
       public List<Map<String, String>> getCastSinks() {
-        return requireNonNullElse(executeMethod.execute(GET_CAST_SINKS, null), emptyList());
+        return executeMethod.execute(GET_CAST_SINKS, null, emptyList());
       }
 
       @Override

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

@@ -18,6 +18,7 @@
 package org.openqa.selenium.remote;
 
 import static java.util.Objects.requireNonNull;
+import static java.util.Objects.requireNonNullElse;
 
 import java.util.Map;
 import org.jspecify.annotations.NullMarked;
@@ -37,9 +38,18 @@ public interface ExecuteMethod {
    * @param parameters The parameters to execute that command with
    * @return The result of {@link Response#getValue()}.
    */
-  @Nullable <T> T execute(String commandName, @Nullable Map<String, ?> parameters);
+  @Nullable Object execute(String commandName, @Nullable Map<String, ?> parameters);
+
+  default <T> T execute(String commandName, @Nullable Map<String, ?> parameters, T defaultValue) {
+    return requireNonNullElse(executeOptional(commandName, parameters), defaultValue);
+  }
+
+  @SuppressWarnings("unchecked")
+  default @Nullable <T> T executeOptional(String commandName, @Nullable Map<String, ?> parameters) {
+    return (T) execute(commandName, parameters);
+  }
 
   default <T> T executeRequired(String commandName, @Nullable Map<String, ?> parameters) {
-    return requireNonNull(execute(commandName, parameters));
+    return requireNonNull(executeOptional(commandName, parameters));
   }
 }

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

@@ -46,7 +46,7 @@ public void selectAccount(int index) {
   @Nullable
   @Override
   public String getDialogType() {
-    return executeMethod.execute(DriverCommand.GET_FEDCM_DIALOG_TYPE, null);
+    return executeMethod.executeOptional(DriverCommand.GET_FEDCM_DIALOG_TYPE, null);
   }
 
   @Override

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

@@ -26,7 +26,7 @@
 class LocalExecuteMethod implements ExecuteMethod {
   @Nullable
   @Override
-  public <T> T execute(String commandName, @Nullable Map<String, ?> parameters) {
+  public Object execute(String commandName, @Nullable Map<String, ?> parameters) {
     throw new WebDriverException("Cannot execute remote command: " + commandName);
   }
 }

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

@@ -31,9 +31,8 @@ public RemoteExecuteMethod(RemoteWebDriver driver) {
     this.driver = Require.nonNull("Remote WebDriver", driver);
   }
 
-  @SuppressWarnings("unchecked")
   @Override
-  public @Nullable <T> T execute(String commandName, @Nullable Map<String, ?> parameters) {
+  public @Nullable Object execute(String commandName, @Nullable Map<String, ?> parameters) {
     Response response;
 
     if (parameters == null || parameters.isEmpty()) {
@@ -42,7 +41,7 @@ public RemoteExecuteMethod(RemoteWebDriver driver) {
       response = driver.execute(commandName, parameters);
     }
 
-    return (T) response.getValue();
+    return response.getValue();
   }
 
   @Override