Author
Kim
Backend software engineer working with Java, Spring Boot, and Kafka. I write about engineering problems, performance work, and architecture decisions from development and operations.
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Practical Guide to Metric-Based Auto-Scaling for Containerized Microservices
A practical guide to setting up metric-driven auto-scaling for containerized microservices with Kubernetes and Prometheus.
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Kafka AdminClient for Topic Configuration: incrementalAlterConfigs, What Happened to alterConfigs, and What the Errors Actually Look Like
Topic configs changed from Java against Kafka 4.3.1: every incrementalAlterConfigs op type with the observed result, proof that the removed alterConfigs API wiped unnamed overrides, and the real exception for each failure, including an ACL denial reproduced without SASL.
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Integrating Spring Boot with Apache Kafka for Exactly-Once Message Processing
This detailed guide helps Java developers integrate Spring Boot with Apache Kafka for exactly-once message processing, ensuring fault-tolerant, atomic event handling using Kafka transactions.
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Implementing Java Custom Annotation Processors for Compile-Time Code Generation
Learn how to implement custom Java annotation processors to automate compile-time code generation with an end-to-end builder pattern example, including setup, testing, and best practices.
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Building Production-Ready AI Model Rollback Mechanisms with Canary Deployments
Discover strategies and implementations for AI model rollback using canary deployments to ensure safer production updates and minimize risk.
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Building Scalable File Upload Services with Chunking and Resume Support
Explore techniques to create scalable, fault-tolerant file upload services with chunked uploads and resumable functionality for large file handling.
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Practical Guide to Kafka Log Compaction for Event Sourcing Architectures
This guide explains Kafka log compaction for event sourcing, including setup, key design, producer/consumer examples, verification, performance tuning, failure modes, and best practices.
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OAuth2 Client Credentials in Spring Security: Tested Wiring for Service-to-Service Calls
A three-app lab on Spring Boot 3.5.16 with a real Spring Authorization Server: how AuthorizedClientServiceOAuth2AuthorizedClientManager caches tokens, when it silently stops caching them, what a wrong secret looks like, and the RestClient and WebFlux wiring that passed the tests.
