# spring-boot-demo

Companion code for the Spring Boot articles on **[ankurm.com](https://ankurm.com)**.

One directory per article. Each is a self-contained Maven project with its own `README.md`,
numbered documentation chapters under `docs/`, and captured real output under `docs/output/`
that a single script regenerates. Every figure quoted in an article came out of one of those
files.

| Directory | Article | What it demonstrates |
|---|---|---|
| [`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 |
| [`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 |
| [`configuration-properties/`](configuration-properties) | [@ConfigurationProperties vs @Value in Spring Boot 4](https://ankurm.com/) | relaxed binding measured three ways, record constructor binding, validation, IDE metadata generation |
| [`profiles-and-config/`](profiles-and-config) | [Spring Boot Profiles Done Right](https://ankurm.com/) | the precedence stack made visible, config trees and ConfigMaps, why a profile file loses to an environment variable |
| [`spring-aop/`](spring-aop) | [Spring AOP Explained](https://ankurm.com/) | every pointcut designator with real matches, JDK vs CGLIB proxies, six aspects that do not fire |

Articles whose text is kept here rather than only on the blog have it under
`<directory>/post/` — `post.md` for the body and `meta.md` for the title, excerpt and
categories.

## Running any of them

Each project needs a JDK 25 and Maven 3.9:

```bash
cd <directory>
export JAVA_HOME=/path/to/jdk-25
mvn -DskipTests package
./scripts/run-all.sh          # regenerate every transcript under docs/output/
```

## Licence

MIT — see [LICENSE](LICENSE).