Ankur Mhatre
958b401f0f
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.
33 lines
1.4 KiB
Markdown
33 lines
1.4 KiB
Markdown
# spring-boot-demo
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Companion code for the Spring Boot articles on **[ankurm.com](https://ankurm.com)**.
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One directory per article. Each is a self-contained Maven project with its own `README.md`,
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numbered documentation chapters under `docs/`, and captured real output under `docs/output/`
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that a single script regenerates. Every figure quoted in an article came out of one of those
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files.
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| Directory | Article | What it demonstrates |
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|---|---|---|
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| [`actuator-in-production/`](actuator-in-production) | [Spring Boot Actuator in Production](https://ankurm.com/spring-boot-actuator-production-endpoints-security-health-indicators/) | endpoint exposure defaults, securing Actuator, custom health indicators and how they hang |
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| [`spring-boot-startup-time/`](spring-boot-startup-time) | [Why Your Spring Boot App Takes 8 Seconds to Start](spring-boot-startup-time/post/post.md) | `BufferingApplicationStartup`, JFR startup events, self time vs total time, the classpath-scan tax, the JDK 25 AOT cache |
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Articles whose text is kept here rather than only on the blog have it under
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`<directory>/post/` — `post.md` for the body and `meta.md` for the title, excerpt and
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categories.
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## Running any of them
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Each project needs a JDK 25 and Maven 3.9:
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```bash
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cd <directory>
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export JAVA_HOME=/path/to/jdk-25
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mvn -DskipTests package
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./scripts/run-all.sh # regenerate every transcript under docs/output/
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```
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## Licence
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MIT — see [LICENSE](LICENSE).
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