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
84 lines
3.7 KiB
Plaintext
84 lines
3.7 KiB
Plaintext
== every source sets demo.greeting at once ==
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$ DEMO_GREETING=from-environment-variable \
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java -Ddemo.greeting=from-system-property \
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-jar target/profiles-and-config-1.0.0.jar --spring.profiles.active=prod \
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--demo.greeting=from-command-line-argument
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{
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"property": "demo.greeting",
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"effectiveValue": "from-command-line-argument",
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"activeProfiles": [
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"prod",
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"prod-db",
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"prod-metrics"
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],
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"holders": [
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{
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"rank": 1,
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"source": "SimpleCommandLinePropertySource {name='commandLineArgs'}",
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"value": "from-command-line-argument",
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"origin": "\"demo.greeting\" from property source \"commandLineArgs\""
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},
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{
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"rank": 2,
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"source": "PropertiesPropertySource {name='systemProperties'}",
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"value": "from-system-property",
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"origin": "\"demo.greeting\" from property source \"systemProperties\""
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},
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{
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"rank": 3,
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"source": "OriginAwareSystemEnvironmentPropertySource {name='systemEnvironment'}",
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"value": "from-environment-variable",
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"origin": "System Environment Property \"DEMO_GREETING\""
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},
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{
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"rank": 4,
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"source": "OriginTrackedMapPropertySource {name='Config resource 'class path resource [application-prod.yaml]' via location 'optional:classpath:/''}",
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"value": "from-application-prod-yaml",
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"origin": "class path resource [application-prod.yaml] from profiles-and-config-1.0.0.jar - 4:13"
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},
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{
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"rank": 5,
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"source": "OriginTrackedMapPropertySource {name='Config resource 'class path resource [application.yaml]' via location 'optional:classpath:/''}",
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"value": "from-application-yaml",
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"origin": "class path resource [application.yaml] from profiles-and-config-1.0.0.jar - 21:13"
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}
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],
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"shadowedCount": 4
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}
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== and with the environment variable removed, nothing else changed ==
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./scripts/demo-precedence.sh: line 41: 5735 Killed DEMO_GREETING=from-environment-variable setsid nohup java -Ddemo.greeting=from-system-property -jar "$JAR" --spring.profiles.active=prod --demo.greeting=from-command-line-argument > /tmp/profiles-precedence.log 2>&1 < /dev/null
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{
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"property": "demo.greeting",
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"effectiveValue": "from-system-property",
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"activeProfiles": [
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"prod",
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"prod-db",
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"prod-metrics"
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],
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"holders": [
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{
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"rank": 1,
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"source": "PropertiesPropertySource {name='systemProperties'}",
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"value": "from-system-property",
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"origin": "\"demo.greeting\" from property source \"systemProperties\""
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},
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{
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"rank": 2,
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"source": "OriginTrackedMapPropertySource {name='Config resource 'class path resource [application-prod.yaml]' via location 'optional:classpath:/''}",
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"value": "from-application-prod-yaml",
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"origin": "class path resource [application-prod.yaml] from profiles-and-config-1.0.0.jar - 4:13"
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},
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{
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"rank": 3,
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"source": "OriginTrackedMapPropertySource {name='Config resource 'class path resource [application.yaml]' via location 'optional:classpath:/''}",
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"value": "from-application-yaml",
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"origin": "class path resource [application.yaml] from profiles-and-config-1.0.0.jar - 21:13"
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}
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],
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"shadowedCount": 2
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}
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./scripts/demo-precedence.sh: line 41: 5796 Killed setsid nohup java -Ddemo.greeting=from-system-property -jar "$JAR" --spring.profiles.active=prod > /tmp/profiles-precedence2.log 2>&1 < /dev/null
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