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
