Taming the JVM
Optimizing Spring Boot Workloads on OpenShift & Kubernetes — 9 live demos, 44 slides, real metrics and honest benchmark results.
Demos
All demos run with ./demo.sh using Podman and Red Hat UBI images.
Container-Aware Heap Sizing
UseContainerSupport + MaxRAMPercentage vs hardcoded -Xmx. Live jcmd output and OOMKill simulation.
GC Monitoring with Prometheus
Spring Boot + Micrometer + Actuator + Grafana LGTM. Live GC pause histograms. G1GC vs ZGC side-by-side.
AppCDS Startup Acceleration
Spring Boot gets ~35-55% improvement — 3-stage Containerfile with training run. The big win for fat JARs.
Project Leyden AOT Cache
Explicit -XX:AOTMode steps on JDK 25. Caches classes + JIT profiles for near-peak startup performance.
REST vs gRPC — Two Protocols
One Spring Boot app, REST on :8080 and gRPC on :9000 via spring-grpc-spring-boot-starter. Honest localhost caveat.
Low-Latency JVM: G1GC vs ZGC
Same code, same heap. GC pause delta measured live under load. ZGC throughput caveat explained.
Right-Sizing & Cost Analysis
Pure Python. 4 nodes → 2 nodes, $6,720/month saving, 17× ROI. No cluster needed.
Project Panama: C++20 via FFM
Foreign Function & Memory API calling native C++20 library. No JNI, no wrappers, Arena safety.
AI Inference: LangChain4j + ONNX
MiniLM-L6-v2 in-process via Panama. Semantic search + incident classification. No Python sidecar.
Reference Docs
Cheat sheets, configuration references, and presenter guides.
Spring Boot Configuration Reference
Container images, GC flags, AppCDS, Leyden, Micrometer, gRPC, Panama FFM — full config reference.
JVM Optimization Cheat Sheet
Heap flags, GC decision tree, thread counts, right-sizing formula, startup ladder, Podman gotchas — quick reference.
Shenandoah GC Guide
Why UBI9 defaults to Shenandoah, how Brooks pointers work, three-way comparison with G1GC and ZGC.
Presenter Guide
Slide-by-slide notes for all 44 slides, timing reference, demo troubleshooting, prep checklist.
Prerequisites — Fedora & macOS
Podman, SDKMAN, JDK 21 & 25, hey, grpcurl, ghz — complete install guide for both platforms.
Excalidraw Diagrams
12 architecture and flow diagrams — interactive viewer, speaker notes, and download links.