java-spring-patterns

What problem does it solve?

This Skill helps engineers implement Spring Boot features in production by standardizing reusable patterns for configuration, resilience, security, messaging, caching, scheduling, observability, and querying.

Core Features & Use Cases

• Type-safe configuration & wiring: Use @ConfigurationProperties, @EnableConfigurationProperties, @ConditionalOnProperty, and @Profile to build predictable bean graphs.
• Resilience and failure handling: Apply Resilience4j circuit breaker, retry, and rate limiter with fallbacks for graceful degradation.
• Production service foundations: Secure endpoints with Spring Security (JWT, stateless sessions), integrate messaging via Kafka/SQS listeners, cache hot paths, schedule recurring jobs with distributed locks, and add metrics/timers with Micrometer/OpenTelemetry.
• Efficient endpoints: Implement pagination, filtering, and sorting using PageRequest plus specification-style query composition.
• Anti-pattern guidance: Avoid common Spring pitfalls like field @Autowired, overly broad @Transactional, controller-to-service calls, silent open-in-view, generic catch blocks in services, and @Async without a configured executor.

Quick Start

Ask the Skill to propose a Spring Boot implementation approach for a new payment API endpoint that is secured with JWT, processes events from Kafka, uses circuit breaker + retry, caches product lookups, and exposes Micrometer metrics.