Various Spring Boot spike solutions for learning.
Many of these are architectural patterns found here.
View Project
A comprehensive Spring Boot spike project exploring enterprise-grade resiliency patterns and reactive programming. Implements a fully-functional e-commerce platform (product catalog, inventory management, and shopping cart) demonstrating production-ready fault tolerance patterns, high-performance reactive architecture, and distributed observability.
| Category |
Technology |
| Resilience |
Resilience4j (circuit breakers, rate limiters, retries) |
| Reactive |
Spring WebFlux, Project Reactor, Netty |
| Messaging |
Apache Pulsar (reactive) |
| Database |
Spring Data R2DBC, PostgreSQL 18 |
| Observability |
OpenTelemetry, Micrometer, Jaeger, SigNoz |
| Secrets |
HashiCorp Vault |
| API Docs |
OpenAPI 3.0, Swagger UI |
| Infrastructure |
Docker, Docker Compose |
| Attribute |
Value |
| Language |
Kotlin 1.9.25 |
| Spring Boot |
3.5.7 |
| Spring Cloud |
2025.0.0 |
| Last Updated |
December 22, 2025 |
View Project
A demonstration of the CQRS (Command Query Responsibility Segregation) and Event Sourcing architectural patterns. Implements a complete Product Catalog system showcasing reactive, event-driven architecture with separate command and query models, event store persistence, and comprehensive observability.
| Category |
Technology |
| Reactive |
Spring WebFlux (non-blocking I/O) |
| Database |
Spring Data R2DBC, PostgreSQL 18, Flyway |
| Resilience |
Resilience4j (circuit breaker, retry, rate limiter) |
| Secrets |
HashiCorp Vault, Spring Cloud Vault Config |
| Observability |
OpenTelemetry, Micrometer, Prometheus, Grafana, Loki, Tempo |
| Testing |
JUnit 5, Mockito, Cucumber BDD, Reactor Test |
| API Docs |
SpringDoc OpenAPI, Swagger |
| Build |
Gradle (Kotlin DSL) |
| Infrastructure |
Docker Compose |
| Attribute |
Value |
| Language |
Kotlin 2.2.21 |
| Spring Boot |
4.0.0 |
| Last Updated |
December 2025 |
View Project
A Spring Boot spike project demonstrating the saga orchestration pattern for managing distributed transactions across multiple services. Implements a complete e-commerce order processing workflow with automatic compensation (rollback) when any step fails, featuring real-time status tracking via Server-Sent Events (SSE), retry support, order history, and comprehensive observability.
| Category |
Technology |
| Reactive |
Spring WebFlux, Project Reactor, Kotlin Coroutines |
| Database |
Spring Data R2DBC, PostgreSQL |
| Tracing |
OpenTelemetry, Jaeger |
| Metrics |
Micrometer, Prometheus, Grafana |
| Logging |
Loki |
| Secrets |
HashiCorp Vault, Spring Cloud Vault |
| Testing |
Cucumber 7.20, TestContainers, Kotest, WireMock 3.9 |
| Load Testing |
k6 |
| Build |
Gradle 9.2 (Kotlin DSL) |
| Infrastructure |
Docker Compose |
| Attribute |
Value |
| Language |
Kotlin 2.2 |
| Spring Boot |
4.0.0 |
| JVM |
Java 24 (Amazon Corretto) |
| Last Updated |
December 15, 2025 |
View Project
A Spring Boot spike project demonstrating Change Data Capture (CDC) using Debezium with PostgreSQL and Kafka (KRaft mode). Implements a complete CDC pipeline that captures row-level database changes from PostgreSQL using logical replication, streams them to Kafka via the Debezium connector, and consumes CDC events in a Spring Boot reactive application with idempotent processing. Includes chaos engineering tools for resilience testing.
| Category |
Technology |
| Reactive |
Spring WebFlux |
| Source Database |
PostgreSQL 16 (R2DBC) |
| Target Database |
MongoDB 8.x (materialized view) |
| Messaging |
Apache Kafka (KRaft mode), Debezium PostgreSQL Connector |
| Observability |
OpenTelemetry, Grafana LGTM Stack (Loki, Tempo, Prometheus) |
| Testing |
JUnit 5, MockK, Cucumber JVM, Awaitility, Playwright |
| Load Testing |
k6 (with xk6-sql, xk6-mongo, xk6-output-prometheus-remote) |
| Chaos Engineering |
Pumba, Toxiproxy |
| Build |
Gradle 9.2 (Kotlin DSL) |
| Infrastructure |
Docker, Docker Compose |
| Attribute |
Value |
| Language |
Kotlin 2.2 |
| Spring Boot |
4.0.1 |
| JVM |
Java 24 |
| Last Updated |
December 26, 2025 |
