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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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spring-boot-startup-time/docs/output/00-versions.txt Normal file
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=== java -version ===
openjdk version "25.0.4.1" 2026-08-18 LTS
OpenJDK Runtime Environment Temurin-25.0.4.1+1 (build 25.0.4.1+1-LTS)
OpenJDK 64-Bit Server VM Temurin-25.0.4.1+1 (build 25.0.4.1+1-LTS, mixed mode, sharing)
=== mvn -version ===
Apache Maven 3.9.11 (3e54c93a704957b63ee3494413a2b544fd3d825b)
=== mvn dependency:list (selected) ===
com.h2database:h2:jar:2.4.240:runtime -- module com.h2database [auto]
io.micrometer:micrometer-core:jar:1.17.1:compile -- module micrometer.core [auto]
org.apache.tomcat.embed:tomcat-embed-core:jar:11.0.24:compile -- module org.apache.tomcat.embed.core
org.hibernate.orm:hibernate-core:jar:7.4.5.Final:compile -- module org.hibernate.orm.core [auto]
org.springframework.boot:spring-boot:jar:4.1.1:compile -- module spring.boot [auto]
org.springframework.data:spring-data-jpa:jar:4.1.1:compile -- module spring.data.jpa [auto]
org.springframework:spring-beans:jar:7.0.9:compile -- module spring.beans [auto]
org.springframework:spring-context:jar:7.0.9:compile -- module spring.context [auto]
org.springframework:spring-core:jar:7.0.9:compile -- module spring.core [auto]