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Three new article modules: configuration binding, profiles and config data, Spring AOP

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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 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Gip4srpzMwjgoba6uEfbr5
This commit is contained in:
asmhatre
2026-09-08 16:47:48 +00:00
co-authored by Claude Opus 5
parent 958b401f0f
commit 86246dc860
107 changed files with 5075 additions and 0 deletions
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configuration-properties/src/main/java/com/ankurm/configprops/ConfigBindingApplication.java
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package com.ankurm.configprops;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.properties.ConfigurationPropertiesScan;
/**
* Companion application for the ankurm.com article
* "@ConfigurationProperties vs @Value in Spring Boot 4".
*
* <p>{@code @ConfigurationPropertiesScan} is what registers the {@code @ConfigurationProperties}
* types in {@code com.ankurm.configprops.props} as beans. Without it &mdash; and without
* {@code @EnableConfigurationProperties} or a stereotype annotation on each type &mdash; the
* classes compile, the application starts, and the beans simply do not exist. That is the first
* entry in the failure gallery: see {@code docs/03-registration.md}.
*/
@SpringBootApplication
@ConfigurationPropertiesScan
public class ConfigBindingApplication {
public static void main(String[] args) {
SpringApplication.run(ConfigBindingApplication.class, args);
}
}