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Spring Boot startup time: bean-by-bean diagnosis, and one directory per post

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Adds spring-boot-startup-time/, the companion project for BLOG-618: a runnable
Spring Boot 4.1.1 application on JDK 25 that installs BufferingApplicationStartup
and FlightRecorderApplicationStartup behind a system property, and a /diag/startup
endpoint that computes step self time -- the number /actuator/startup does not give
you and the one that names the actual culprits.

Captured under docs/output/: the step tree sorted both ways, the same startup as JFR
events, a +5000-class experiment putting 0.11 ms per scanned class on the classpath
scan tax, the silent truncation a 2048-step buffer performs, and JDK 25 AOT cache
timings (6.93 s to 4.82 s). Post body and metadata live in post/.

Moves the existing Actuator project into actuator-in-production/ so the repository
holds one directory per article; the root README is now an index.
This commit is contained in:
Ankur Mhatre
2026-09-04 23:58:38 +05:30
parent 4b6cefa60a
commit 958b401f0f
112 changed files with 2744 additions and 154 deletions
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7
spring-boot-startup-time/scripts/env.sh Executable file
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# Shared environment. Override JAVA_HOME to point at your own JDK 25.
: "${JAVA_HOME:?set JAVA_HOME to a JDK 25 installation}"
export PATH="$JAVA_HOME/bin:$PATH"
ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
JAR="$ROOT/target/startup-diagnosis-1.0.0.jar"
OUT="$ROOT/docs/output"
MAIN=com.ankurm.startup.StartupDiagnosisApplication