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
42 lines
2.6 KiB
Plaintext
42 lines
2.6 KiB
Plaintext
== does application-prod.yaml win? ==
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demo.datasource-url is set in application.yaml and again in application-prod.yaml.
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--- 1. prod profile active, no environment variable ---
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$ java -jar target/profiles-and-config-1.0.0.jar --spring.profiles.active=prod
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active profiles : prod, prod-db, prod-metrics
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effective value : jdbc:postgresql://prod-db:5432/orders
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1. jdbc:postgresql://prod-db:5432/orders <- 'file application-prod.yaml' via location 'optional:classpath:/''}
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2. jdbc:h2:mem:default <- 'file application.yaml' via location 'optional:classpath:/''}
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holders that lost: 1
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--- 2. identical, plus one leftover environment variable ---
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$ DEMO_DATASOURCE_URL=jdbc:postgresql://leftover:5432/orders \
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java -jar target/profiles-and-config-1.0.0.jar --spring.profiles.active=prod
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active profiles : prod, prod-db, prod-metrics
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effective value : jdbc:postgresql://leftover:5432/orders
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1. jdbc:postgresql://leftover:5432/orders <- OriginAwareSystemEnvironmentPropertySource {name='systemEnvironment'}
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2. jdbc:postgresql://prod-db:5432/orders <- 'file application-prod.yaml' via location 'optional:classpath:/''}
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3. jdbc:h2:mem:default <- 'file application.yaml' via location 'optional:classpath:/''}
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holders that lost: 2
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The profile-specific file is still loaded and still holds its value -- it is listed,
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and it lost. Config data is item 3 in the documented precedence list; OS environment
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variables are item 5, and later items win.
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== the full property-source stack, in order ==
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$ curl -s localhost:8080/sources
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1. MapPropertySource server.ports
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2. ConfigurationPropertySourcesPropertySource configurationProperties
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3. SimpleCommandLinePropertySource commandLineArgs
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4. StubPropertySource servletConfigInitParams
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5. ServletContextPropertySource servletContextInitParams
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6. PropertiesPropertySource systemProperties
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7. OriginAwareSystemEnvironmentPropertySource systemEnvironment
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8. RandomValuePropertySource random
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9. OriginTrackedMapPropertySource Config resource 'class path resource [application-prod-metrics.yaml]' via location 'optional:classpath:/'
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10. OriginTrackedMapPropertySource Config resource 'class path resource [application-prod-db.yaml]' via location 'optional:classpath:/'
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11. OriginTrackedMapPropertySource Config resource 'class path resource [application-prod.yaml]' via location 'optional:classpath:/'
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12. OriginTrackedMapPropertySource Config resource 'class path resource [application.yaml]' via location 'optional:classpath:/'
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13. ApplicationInfoPropertySource applicationInfo
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