[java] JSpecify annotations for ExecuteMethod (#16464)

Co-authored-by: Diego Molina <diemol@users.noreply.github.com>

Author: mk868

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

@@ -18,11 +18,14 @@
 package org.openqa.selenium.remote;
 
 import java.util.Map;
+import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.Nullable;
 
 /**
  * An encapsulation of {@link org.openqa.selenium.remote.RemoteWebDriver#executeScript(String,
  * Object...)}.
  */
+@NullMarked
 public interface ExecuteMethod {
   /**
    * Execute the given command on the remote webdriver server. Any exceptions will be thrown by the
@@ -32,5 +35,5 @@ public interface ExecuteMethod {
    * @param parameters The parameters to execute that command with
    * @return The result of {@link Response#getValue()}.
    */
-  Object execute(String commandName, Map<String, ?> parameters);
+  @Nullable Object execute(String commandName, @Nullable Map<String, ?> parameters);
 }

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

@@ -18,10 +18,13 @@
 package org.openqa.selenium.remote;
 
 import java.util.Map;
+import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.Nullable;
 import org.openqa.selenium.WebDriver;
 import org.openqa.selenium.WrapsDriver;
 import org.openqa.selenium.internal.Require;
 
+@NullMarked
 public class RemoteExecuteMethod implements ExecuteMethod, WrapsDriver {
   private final RemoteWebDriver driver;
 
@@ -30,7 +33,7 @@ public RemoteExecuteMethod(RemoteWebDriver driver) {
   }
 
   @Override
-  public Object execute(String commandName, Map<String, ?> parameters) {
+  public @Nullable Object execute(String commandName, @Nullable Map<String, ?> parameters) {
     Response response;
 
     if (parameters == null || parameters.isEmpty()) {