Ankur Mhatre
86246dc860
configuration-properties/ @ConfigurationProperties vs @Value on Spring Boot 4.1.1. The relaxed-binding matrix is generated by binding each spelling rather than transcribed, and re-checked against real processes -- the in-process probe was wrong twice before it was right. Records the three findings that came out of it: @Value does get relaxed resolution inside Spring Boot (Boot attaches ConfigurationPropertySources), the configuration processor silently stops generating metadata on JDK 23+ when declared as a plain dependency, and @Valid is not what makes nested constraints run. profiles-and-config/ Precedence, profiles, spring.config.import and config trees. /precedence reports every source holding a property in rank order with file and line, which turns "my profile file had no effect" into a two-line answer. Also pins the counterintuitive one: an imported file outranks the file that imported it. spring-aop/ Designators, proxy types, and aspects that do not fire. One advice per supported designator so the reference table is generated from real matches; all fourteen unsupported designators fed to the parser. Two corrections to the reference documentation: unsupported designators throw UnsupportedPointcutPrimitiveException (extends RuntimeException, not IllegalArgumentException), and spring-boot-starter-aop was renamed to spring-boot-starter-aspectj in Boot 4. 19 contract tests across the three modules, 15 captured transcripts, all regenerated by scripts/run-all.sh. Verified on Spring Boot 4.1.1, Spring Framework 7.0.9, JDK 25.0.4.1. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Gip4srpzMwjgoba6uEfbr5
57 lines
2.4 KiB
Markdown
57 lines
2.4 KiB
Markdown
[Index](../README.md) · [Profiles →](02-profiles.md)
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# 1. The precedence list
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Spring Boot's documented order, lowest precedence first. Later entries win.
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| # | Source |
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|---|---|
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| 1 | Default properties (`SpringApplication.setDefaultProperties`) |
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| 2 | `@PropertySource` on `@Configuration` classes |
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| 3 | **Config data** — `application.properties`, `application.yaml`, profile-specific files, `spring.config.import` |
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| 4 | `RandomValuePropertySource` (`random.*`) |
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| 5 | **OS environment variables** |
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| 6 | Java system properties (`-D`) |
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| 7 | JNDI attributes from `java:comp/env` |
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| 8 | `ServletContext` init parameters |
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| 9 | `ServletConfig` init parameters |
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| 10 | `SPRING_APPLICATION_JSON` |
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| 11 | Command-line arguments |
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| 12 | `properties` on `@SpringBootTest` |
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| 13 | `@DynamicPropertySource` |
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| 14 | `@TestPropertySource` |
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| 15 | Devtools global settings |
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## The two rows that matter
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**Item 3 covers every file you write.** `application.yaml`, `application-prod.yaml`, an
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imported config tree, a mounted ConfigMap — all of it is config data, all of it at rank 3.
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**Item 5 is above it.** Every environment variable outranks every file.
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Profile-specific files beat non-profile files, and later imports beat earlier ones, but those
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are orderings *within* item 3. Nothing inside item 3 can reach item 5.
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That single fact explains the bug this project exists for, and
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[chapter 4](04-why-your-profile-file-lost.md) walks through it with a transcript.
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## Seeing it for real
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`/sources` prints the live stack, which is more useful than the table because it shows exactly
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which files were loaded:
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```
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3. SimpleCommandLinePropertySource commandLineArgs
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6. PropertiesPropertySource systemProperties
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7. OriginAwareSystemEnvironmentPropertySource systemEnvironment
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9. OriginTrackedMapPropertySource application-prod-metrics.yaml
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10. OriginTrackedMapPropertySource application-prod-db.yaml
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11. OriginTrackedMapPropertySource application-prod.yaml
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12. OriginTrackedMapPropertySource application.yaml
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```
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Note rank 2 in the real stack, which the table does not mention:
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`ConfigurationPropertySourcesPropertySource`, named `configurationProperties`. That is the
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source Spring Boot attaches to give `${...}` placeholders the binder's relaxed name matching —
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see the [binding project's chapter 2](../../configuration-properties/docs/02-relaxed-binding.md).
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