Java Design and Integration Patterns

Guide Java developers in selecting patterns by problem signal, implementation context, and trade-off rather than by pattern name alone.

What is covered in this Skill?

• Classic Java design patterns for application code: creational, structural, and behavioral patterns
• REST API patterns for resource design, contracts, idempotency, versioning, and error handling
• Kafka and event-driven patterns for event schemas, partitioning, idempotency, retries, outbox, and sagas
• Database and persistence patterns for repositories, transactions, aggregates, locking, migrations, and read models
• Cross-cutting integration patterns for anti-corruption layers, resilience, observability, and reliable message boundaries

Scope: Use this skill to explain, review, and implement practical patterns in Java systems. Prefer simple code first; introduce a pattern only when it reduces real complexity, protects a boundary, improves testability, or makes change safer.

Constraints

Pattern guidance must be problem-led, concrete, and safe to apply in Java projects.