immutables/immutables

Health v2 · maintenance only

Adoption not part of the score

3570 stars · 295 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

A Java annotation processor that generates immutable value classes, builders, and copy-with methods from interfaces, abstract classes, and records. It eliminates boilerplate while supporting Jackson/Gson JSON integration and extensive customization via styles.

Use cases

• generate builders for java records
• create immutable value objects in java
• reduce boilerplate for data classes
• generate immutable collections wrappers
• jackson serialization for immutable classes
• generate with* copy methods for value objects

When to choose

• you want thread-safe immutable data types without hand-writing builders
• you need generated builders for records or abstract value types
• you want JSON (Jackson/Gson) support for immutable models
• you prefer annotation-processor codegen over runtime reflection

When to avoid

• you use Kotlin or another language with built-in data classes
• you need mutable entities like JPA/Hibernate entities
• your build cannot tolerate annotation processing overhead

Facets

library · maturity active

serialization developer-tools developer-tools programming-languages jvm annotation-processor immutable-objects builder-pattern jackson gson java-records boilerplate-reduction

Member repositories

For agents

markdown · JSON · MCP: product_card(name="immutables/immutables")