WW-5652 Add support for Java records and Optional serialization in the JSON plugin.

[srilakshmikanthanp]

Summary

• Java records are now serialized using RecordComponent metadata, as Introspector.getBeanInfo() does not expose record components through the traditional JavaBeans property model.
• java.util.Optional now serializes as its contained value or null when empty. Optional.empty() is treated as null when excludeNullProperties is enabled, including for bean/record properties and map values.
• @JSON and @JSONFieldBridge annotations can now be applied directly to record components.

I implemented these changes based on my understanding of the existing codebase and tried to keep the implementation minimal and consistent with the current design.

I'd appreciate a review of the implementation and approach. If you'd like any changes, please let me know and I'll update the PR.

[lukaszlenart]

Please create a JIRA ticket first https://issues.apache.org/jira/projects/WW/

[srilakshmikanthanp]

Thanks! I've requested an Apache JIRA account. Once it's approved, I'll create the JIRA issue and update this PR with the issue number.

[srilakshmikanthanp]

@lukaszlenart I created the required JIRA issue: WW-5652. Please let me know if any further changes are needed.

[Copilot]

Pull request overview

This PR updates the Struts JSON plugin’s serializer to natively support Java records (via RecordComponent metadata) and to serialize java.util.Optional as its contained value (or null when empty), aligning record/Optional handling with existing excludeNullProperties behavior.

Changes:

• Add record-aware serialization path in StrutsJSONWriter, iterating record components and honoring @JSON / @JSONFieldBridge.
• Add Optional unwrapping during serialization, and treat Optional.empty() as “absent” when excludeNullProperties is enabled (including map values).
• Expand unit test coverage for record serialization scenarios and Optional behaviors.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
plugins/json/src/main/java/org/apache/struts2/json/StrutsJSONWriter.java	Adds Optional handling, record component iteration serialization, and “absent” detection to support excludeNullProperties behavior.
plugins/json/src/test/java/org/apache/struts2/json/StrutsJSONWriterTest.java	Adds tests covering record serialization, annotation behavior on record components, include/exclude filters, and Optional serialization/exclusion semantics.
plugins/json/src/main/java/org/apache/struts2/json/annotations/JSONFieldBridge.java	Allows @JSONFieldBridge to be applied to record components.
plugins/json/src/main/java/org/apache/struts2/json/annotations/JSON.java	Allows @JSON to be applied to record components.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.