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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 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Gip4srpzMwjgoba6uEfbr5
This commit is contained in:
Ankur Mhatre
2026-09-08 16:36:17 +00:00
parent 958b401f0f
commit 86246dc860
107 changed files with 5075 additions and 0 deletions
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22
configuration-properties/scripts/demo-validation.sh Executable file
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#!/usr/bin/env bash
# What a failing @Validated @ConfigurationProperties actually prints at startup.
set -euo pipefail
cd "$(dirname "$0")/.."
source scripts/env.sh
{
echo "== startup with demo.validated.* deliberately out of range =="
echo "\$ java -jar $JAR --spring.profiles.active=badvalidation"
echo
java -jar "$JAR" --spring.profiles.active=badvalidation \
--spring.main.web-application-type=none 2>&1 | clean \
| sed -n '/APPLICATION FAILED TO START/,/^Update your application/p'
echo
echo
echo "All four violations are reported at once, each with the file and line that supplied"
echo "the value. The process refused to start rather than serving traffic with a pool size"
echo "of 4000."
echo
echo "Note demo.validated.pool.size has no Origin line. It is a nested record reached"
echo "through @Valid, and the binder tracks origins per bound property, not per constraint."
} > docs/output/04-validation-failure.txt 2>&1
cat docs/output/04-validation-failure.txt