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

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

profiles-and-config/docs/output/01-precedence.txt

@@ -0,0 +1,83 @@
+== every source sets demo.greeting at once ==
+
+$ DEMO_GREETING=from-environment-variable \
+    java -Ddemo.greeting=from-system-property \
+         -jar target/profiles-and-config-1.0.0.jar --spring.profiles.active=prod \
+         --demo.greeting=from-command-line-argument
+
+{
+    "property": "demo.greeting",
+    "effectiveValue": "from-command-line-argument",
+    "activeProfiles": [
+        "prod",
+        "prod-db",
+        "prod-metrics"
+    ],
+    "holders": [
+        {
+            "rank": 1,
+            "source": "SimpleCommandLinePropertySource {name='commandLineArgs'}",
+            "value": "from-command-line-argument",
+            "origin": "\"demo.greeting\" from property source \"commandLineArgs\""
+        },
+        {
+            "rank": 2,
+            "source": "PropertiesPropertySource {name='systemProperties'}",
+            "value": "from-system-property",
+            "origin": "\"demo.greeting\" from property source \"systemProperties\""
+        },
+        {
+            "rank": 3,
+            "source": "OriginAwareSystemEnvironmentPropertySource {name='systemEnvironment'}",
+            "value": "from-environment-variable",
+            "origin": "System Environment Property \"DEMO_GREETING\""
+        },
+        {
+            "rank": 4,
+            "source": "OriginTrackedMapPropertySource {name='Config resource 'class path resource [application-prod.yaml]' via location 'optional:classpath:/''}",
+            "value": "from-application-prod-yaml",
+            "origin": "class path resource [application-prod.yaml] from profiles-and-config-1.0.0.jar - 4:13"
+        },
+        {
+            "rank": 5,
+            "source": "OriginTrackedMapPropertySource {name='Config resource 'class path resource [application.yaml]' via location 'optional:classpath:/''}",
+            "value": "from-application-yaml",
+            "origin": "class path resource [application.yaml] from profiles-and-config-1.0.0.jar - 21:13"
+        }
+    ],
+    "shadowedCount": 4
+}
+
+== and with the environment variable removed, nothing else changed ==
+./scripts/demo-precedence.sh: line 41:  5735 Killed                  DEMO_GREETING=from-environment-variable setsid nohup java -Ddemo.greeting=from-system-property -jar "$JAR" --spring.profiles.active=prod --demo.greeting=from-command-line-argument > /tmp/profiles-precedence.log 2>&1 < /dev/null
+{
+    "property": "demo.greeting",
+    "effectiveValue": "from-system-property",
+    "activeProfiles": [
+        "prod",
+        "prod-db",
+        "prod-metrics"
+    ],
+    "holders": [
+        {
+            "rank": 1,
+            "source": "PropertiesPropertySource {name='systemProperties'}",
+            "value": "from-system-property",
+            "origin": "\"demo.greeting\" from property source \"systemProperties\""
+        },
+        {
+            "rank": 2,
+            "source": "OriginTrackedMapPropertySource {name='Config resource 'class path resource [application-prod.yaml]' via location 'optional:classpath:/''}",
+            "value": "from-application-prod-yaml",
+            "origin": "class path resource [application-prod.yaml] from profiles-and-config-1.0.0.jar - 4:13"
+        },
+        {
+            "rank": 3,
+            "source": "OriginTrackedMapPropertySource {name='Config resource 'class path resource [application.yaml]' via location 'optional:classpath:/''}",
+            "value": "from-application-yaml",
+            "origin": "class path resource [application.yaml] from profiles-and-config-1.0.0.jar - 21:13"
+        }
+    ],
+    "shadowedCount": 2
+}
+./scripts/demo-precedence.sh: line 41:  5796 Killed                  setsid nohup java -Ddemo.greeting=from-system-property -jar "$JAR" --spring.profiles.active=prod > /tmp/profiles-precedence2.log 2>&1 < /dev/null