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
76 lines
2.1 KiB
Markdown
76 lines
2.1 KiB
Markdown
[← Broken aspect gallery](05-broken-aspect-gallery.md) · [Index](../README.md)
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# 6. Diagnosing a silent aspect
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Endpoint: [`AopDiagnosticsEndpoint`](../src/main/java/com/ankurm/aop/web/AopDiagnosticsEndpoint.java).
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Almost every non-firing aspect is one of three things, and all three are visible in one place.
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## The three questions, in order
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**1. Is the bean proxied at all?**
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```java
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AopUtils.isAopProxy(bean)
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```
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`false` means no pointcut matched this bean, or it is not a bean. Stop here and check the
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pointcut and the registration.
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**2. Which kind of proxy?**
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```java
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AopUtils.isJdkDynamicProxy(bean) // interfaces only
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AopUtils.isCglibProxy(bean) // subclass
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```
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If it is a JDK proxy and your method is not on an interface, that is your answer.
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**3. Is your advice in the advisor list?**
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```java
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if (bean instanceof Advised advised) {
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Arrays.stream(advised.getAdvisors())
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.map(a -> a.getAdvice().getClass().getSimpleName())
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.forEach(System.out::println);
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}
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```
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Proxied, right kind, and your advice missing means the pointcut matched the *bean* but not the
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*method*.
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## Output
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```
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defaultOrderService CGLIB subclass target=DefaultOrderService
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class : DefaultOrderService$$SpringCGLIB$$0
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interfaces : (none)
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advisors : 11
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```
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## Testing a pointcut without an application
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The fastest check of all, and it belongs in a test rather than in a diagnostic endpoint:
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```java
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AspectJExpressionPointcut pointcut = new AspectJExpressionPointcut();
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pointcut.setExpression("execution(* com.example.service.*.*(..))");
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assertThat(pointcut.matches(Foo.class.getMethod("bar"), Foo.class)).isTrue();
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```
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Remember that `setExpression` does not parse; the parse happens on first `matches`. So this is
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also how you find out that a designator is unsupported before production does.
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## Logging
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```
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logging.level.org.springframework.aop=DEBUG
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```
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reports proxy creation per bean. Verbose, but it answers question 1 for every bean at once.
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## Delete the endpoint before shipping
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It reports internal wiring. If you want it permanently, put it behind the management port and
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authentication.
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