[java] Add nullness for virtualauthenticator

java/src/org/openqa/selenium/virtualauthenticator/Credential.java

@@ -23,6 +23,8 @@
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
+import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.Nullable;
 import org.openqa.selenium.internal.Require;
 
 /**
@@ -31,13 +33,14 @@
  * @see <a
  * href="https://w3c.github.io/webauthn/#credential-parameters">https://w3c.github.io/webauthn/#credential-parameters</a>
  */
+@NullMarked
 public class Credential {
 
  private final byte[] id;
  private final boolean isResidentCredential;
  private final String rpId;
  private final PKCS8EncodedKeySpec privateKey;
- private final byte[] userHandle;
+ private final byte @Nullable [] userHandle;
  private final int signCount;
 
  /** Creates a non resident (i.e. stateless) credential. */
@@ -75,7 +78,7 @@ private Credential(
  boolean isResidentCredential,
  String rpId,
  PKCS8EncodedKeySpec privateKey,
- byte[] userHandle,
+ byte @Nullable [] userHandle,
  int signCount) {
  this.id = Require.nonNull("Id", id);
  this.isResidentCredential = isResidentCredential;
@@ -101,7 +104,7 @@ public PKCS8EncodedKeySpec getPrivateKey() {
  return privateKey;
  }
 
- public byte[] getUserHandle() {
+ public byte @Nullable [] getUserHandle() {
  return userHandle == null ? null : Arrays.copyOf(userHandle, userHandle.length);
  }
 

java/src/org/openqa/selenium/virtualauthenticator/HasVirtualAuthenticator.java

@@ -17,7 +17,10 @@
 
 package org.openqa.selenium.virtualauthenticator;
 
+import org.jspecify.annotations.NullMarked;
+
 /** Interface implemented by each driver that allows access to the virtual authenticator API. */
+@NullMarked
 public interface HasVirtualAuthenticator {
  /**
  * Adds a virtual authenticator with the given options.

java/src/org/openqa/selenium/virtualauthenticator/VirtualAuthenticator.java

@@ -18,8 +18,10 @@
 package org.openqa.selenium.virtualauthenticator;
 
 import java.util.List;
+import org.jspecify.annotations.NullMarked;
 
 /** Represents a virtual authenticator. */
+@NullMarked
 public interface VirtualAuthenticator {
 
  /**

java/src/org/openqa/selenium/virtualauthenticator/VirtualAuthenticatorOptions.java

@@ -20,13 +20,15 @@
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
+import org.jspecify.annotations.NullMarked;
 
 /**
  * Options for the creation of virtual authenticators.
  *
  * @see <a
  * href="https://w3c.github.io/webauthn/#sctn-automation">https://w3c.github.io/webauthn/#sctn-automation</a>
  */
+@NullMarked
 public class VirtualAuthenticatorOptions {
 
  public enum Protocol {