Projects

Open-source Java libraries and demos I maintain on GitHub.

• ASCIISafeCharsets — A CharsetProvider SPI that transliterates Unicode text into ASCII-safe subsets instead of rejecting or replacing non-ASCII characters. Four charset variants, including fixed-width record formats like ACH that require 1:1 character mapping.
• RetryHTTP — HTTP-aware retry predicates and Retry-After header support for Resilience4j. Distinguishes responses that should be retried (e.g. 503) from those that shouldn’t (e.g. 200) while respecting server-requested delays.
• Masking — Java wrapper types that protect sensitive data from accidental exposure in logs and toString() output. A Sensitive<T> base class with customizable Renderer implementations controls how much is revealed via format strings — useful for PII like SSNs and credit-card numbers.
• AtLeastOnce — A Spring Boot demo of Kafka at-least-once delivery: idempotent producers with full broker acknowledgments, manual consumer-side offset commits, and Resilience4j circuit breakers with retries at the application layer.
• RotatingSecrets — Zero-downtime database credential rotation for Spring applications in Kubernetes. HikariCP and Oracle UCP components watch mounted secret files and refresh pool credentials via a publisher-subscriber pattern, without disrupting existing connections.