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The most practical Java pattern every backend developer should use in 2026: Record Builder pattern for immutable DTOs:
In real-world Java projects (Spring Boot, microservices, APIs, data pipelines), we constantly create DTOs for requests, responses, events, and database projections.
The best modern pattern:Use records (immutable by default) Builder pattern for flexible construction while keeping immutability.
Benefits:
- Immutable → thread-safe & predictable
- No boilerplate getters/setters
- Builder gives nice fluent API for optional fields
- Works perfectly with Jackson, MapStruct, validation, etc.
Realistic example below: