[java] Add nullness for virtualauthenticator

[mk868]

User description

Description

In this PR I'm adding nullness annotations for classes:

• org.openqa.selenium.virtualauthenticator.Credential
• org.openqa.selenium.virtualauthenticator.HasVirtualAuthenticator
• org.openqa.selenium.virtualauthenticator.VirtualAuthenticator
• org.openqa.selenium.virtualauthenticator.VirtualAuthenticatorOptions

NullAway analysis: #14421

Motivation and Context

The JSpecify nullness annotations will give developers better exposure to potential problems with their code to avoid NullPointerExceptions.
Related issue: #14291

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

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PR Type

Enhancement

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Description

• Added JSpecify @NullMarked annotations to virtual authenticator classes.

• Introduced @Nullable annotations for nullable fields and methods.

• Enhanced null-safety for Credential class with nullable user handle.

• Improved IDE/static analyzer support for nullness checks.

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Changes walkthrough 📝

Relevant files

Enhancement

Credential.java Add nullness annotations to `Credential` class                      java/src/org/openqa/selenium/virtualauthenticator/Credential.java Added @NullMarked annotation to the class. Marked userHandle field and related methods as @Nullable. Enhanced null-safety in constructor and getter methods. +6/-3      HasVirtualAuthenticator.java Add nullness annotations to `HasVirtualAuthenticator` interface java/src/org/openqa/selenium/virtualauthenticator/HasVirtualAuthenticator.java Added @NullMarked annotation to the interface. +3/-0      VirtualAuthenticator.java Add nullness annotations to `VirtualAuthenticator` interface java/src/org/openqa/selenium/virtualauthenticator/VirtualAuthenticator.java Added @NullMarked annotation to the interface. +2/-0      VirtualAuthenticatorOptions.java Add nullness annotations to `VirtualAuthenticatorOptions` class java/src/org/openqa/selenium/virtualauthenticator/VirtualAuthenticatorOptions.java Added @NullMarked annotation to the class. +2/-0

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[qodo-merge-pro]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

🎫 Ticket compliance analysis ✅ 14291 - PR Code Verified Compliant requirements: Add JSpecify Nullness annotations to Selenium framework code Annotations should specify which parameters and return values can be null Improve IDE and static code analyzer support for null checks Requires further human verification: Enhance interoperability with Kotlin (needs testing with Kotlin codebase)

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Null Safety Verify that the null handling in getUserHandle() method is correct and consistent with the class's usage patterns public byte @Nullable [] getUserHandle() { return userHandle == null ? null : Arrays.copyOf(userHandle, userHandle.length); }

[qodo-merge-pro]

PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Score
Possible issue	Add defensive copying for nullable array parameter in constructor to prevent potential null pointer exceptions Add a null check for the userHandle parameter in the constructor to prevent potential NPE when copying the array. While the field is marked @nullable, defensive copying should handle null values explicitly. java/src/org/openqa/selenium/virtualauthenticator/Credential.java [76-85] private Credential( byte[] id, boolean isResidentCredential, String rpId, PKCS8EncodedKeySpec privateKey, byte @Nullable [] userHandle, int signCount) { this.id = Require.nonNull("Id", id); this.isResidentCredential = isResidentCredential; this.rpId = rpId; + this.userHandle = userHandle != null ? Arrays.copyOf(userHandle, userHandle.length) : null; Apply this suggestion Suggestion importance[1-10]: 8 Why: The suggestion addresses a potential null pointer exception and security concern by implementing defensive copying of the nullable array parameter, which is important for maintaining object immutability and preventing external modifications to internal state.	8

[mk868]

This PR solves the following error:

java/src/org/openqa/selenium/virtualauthenticator/Credential.java:46: error: [NullAway] passing @Nullable parameter 'null' where @NonNull is required return new Credential(id, false, Require.nonNull("rpId", rpId), privateKey, null, signCount); ^ (see http://t.uber.com/nullaway ) 

There are 3 more problems in Credential#fromMap(Map<String, Object>) which will be solved in a dedicated PR