Question 1

How do I change a JSON field name for a Java property in Yasson?

Accepted Answer

Use the @JsonbProperty annotation on the field or getter method. For example, annotating with @JsonbProperty("custom_name") serializes the property as 'custom_name' in JSON. This mirrors similar annotations in other JSON libraries but is part of the JSON-B standard.

Question 2

Yasson vs Jackson: which one should I choose for my Java project?

Accepted Answer

Choose Yasson if you need strict JSON-B compliance, especially in Jakarta EE environments, as it's the reference implementation. Jackson offers more features, better performance, and a larger ecosystem, but Yasson provides a cleaner, standards-based approach with less vendor lock-in.

Question 3

Does Yasson support handling polymorphic types or inheritance?

Accepted Answer

Yes, Yasson supports polymorphism through annotations like @JsonbSubtype and @JsonbTypeInfo, allowing you to manage inheritance hierarchies in JSON serialization. However, setup can be more complex compared to Jackson's @JsonTypeInfo.

Question 4

How can I include null values in JSON output with Yasson?

Accepted Answer

Configure it programmatically using JsonbConfig: create an instance with .withNullValues(true) and pass it to JsonbBuilder.create(config). This ensures null properties are serialized, though it might increase JSON size unnecessarily in some cases.

Question 5

Is Yasson compatible with Spring Boot out of the box?

Accepted Answer

No, Spring Boot defaults to Jackson for JSON processing. You can integrate Yasson by adding it as a dependency and manually configuring it as the JSON-B provider, but this requires extra setup and may conflict with existing Jackson configurations.

Question 6

What are the performance benchmarks for Yasson compared to Gson?

Accepted Answer

Yasson and Gson have similar performance for standard use cases, but Jackson often benchmarks faster in high-throughput tests. For most applications, the difference is minor, but if performance is critical, consider profiling with your specific data models.

Yasson

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