[java] Add nullness for virtualauthenticator (SeleniumHQ#15082)

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

Author: 2 people

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 {