如何判断Spring Boot中Load Time Weaving是否正常生效？

环境与配置 #

• Spring Boot版本：3.0.12
• 已完成的LTW相关配置：
  1. 在META-INF目录下创建aop.xml：

     <aspectj>
       <aspects>
         <aspect name="com.example.helloworld.aspects.DaoExceptionHandler"/>
     
         <weaver options="-verbose -showWeaveInfo">
           <include within="com.example.helloworld.*"/>
         </weaver>
       </aspects>
     </aspectj>
     

  2. 启动应用时添加Java代理参数：-javaagent:/Users/dm/.m2/repository/org/aspectj/aspectjweaver/1.9.20/aspectjweaver-1.9.20.jar
  3. pom.xml中引入AspectJ依赖：

     <dependency>
       <groupId>org.aspectj</groupId>
       <artifactId>aspectjrt</artifactId>
       <version>1.9.20</version>
     </dependency>
     <dependency>
       <groupId>org.aspectj</groupId>
       <artifactId>aspectjweaver</artifactId>
       <version>1.9.20</version>
     </dependency>
     

切面与目标类实现 #

切面代码 #

@Aspect
@Slf4j
public class DaoExceptionHandler {
  @AfterThrowing(
      pointcut =
          "execution(* *(..)) &&"
              + " @annotation(com.example.helloworld.utils.HandleDaoException)",
      throwing = "ex")
  public void handle(RuntimeException ex) {
    log.error("Exception received on dao", ex);
    throw JooqUtil.mapException(ex);
  }
}

目标类（使用自定义注解） #

@Component
public class DaoImpl {
  @HandleDaoException
  public void getError() {
    throw new IllegalArgumentException("Test");
  }
}

启动与运行现象 #

1. 启动日志显示AspectJ织入器已加载并读取配置：

   2024-04-23T16:21:08.770+05:30  INFO 33973 --- [           main] c.e.helloworld.HelloWorldApplication     : Started HelloWorldApplication in 0.797 seconds (process running for 1.13)
   [MethodUtil@4b627298] info AspectJ Weaver Version 1.9.20 built on Tuesday Aug 15, 2023 at 23:35:34 PDT
   [MethodUtil@4b627298] info register classloader sun.reflect.misc.MethodUtil@4b627298
   [MethodUtil@4b627298] info using configuration /Users/debrajmanna/code/java/github/spring-boot-hello-world/target/classes/META-INF/aop.xml
   [MethodUtil@4b627298] info register aspect com.example.helloworld.aspects.DaoExceptionHandler
   

2. 调用接口curl --request GET 'http://localhost:8080/hello'触发异常后，栈追踪显示仍在使用CGLIB代理：

   java.lang.IllegalArgumentException: Test
       at com.example.helloworld.dao.DaoImpl.getError(DaoImpl.java:10) ~[classes/:na]
       at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
       at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na]
       at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
       at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na]
       at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:343) ~[spring-aop-6.0.13.jar:6.0.13]
       at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:196) ~[spring-aop-6.0.13.jar:6.0.13]
       at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-6.0.13.jar:6.0.13]
       at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:751) ~[spring-aop-6.0.13.jar:6.0.13]
       at org.springframework.aop.aspectj.AspectJAfterThrowingAdvice.invoke(AspectJAfterThrowingAdvice.java:64) ~[spring-aop-6.0.13.jar:6.0.13]
       at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:173) ~[spring-aop-6.0.13.jar:6.0.13]
       at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:751) ~[spring-aop-6.0.13.jar:6.0.13]
       at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:97) ~[spring-aop-6.0.13.jar:6.0.13]
       at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:184) ~[spring-aop-6.0.13.jar:6.0.13]
       at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:751) ~[spring-aop-6.0.13.jar:6.0.13]
       at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:703) ~[spring-aop-6.0.13.jar:6.0.13]
       at com.example.helloworld.dao.DaoImpl$$SpringCGLIB$$0.getError(<generated>) ~[classes/:na]
       ...
   

3. 即使移除-javaagent参数并添加@EnableAspectJAutoProxy，栈追踪依然显示使用CGLIB代理。

疑问 #

我原本理解：未启用LTW时Spring默认使用CGLIB代理，但现在已经配置了LTW，栈追踪却还是显示CGLIB在工作。请问我的理解是否有误？如何正确判断Spring中Load Time Weaving是否正常生效？

内容的提问来源于stack exchange，提问作者tuk