Description

This project is the PoC of injecting AspectJ aspects into already built Spring Boot application through Java agent

How to run

Create demo application with Spring Initializr

Build this project and modify starting script of your Spring Boot application like that:

#!/usr/bin/env bash

java -javaagent:aspectjweaver-1.9.7.jar \
     -javaagent:spring-aop-java-agent-inject-1.0.0.jar \
     -jar demo-1.0.0.jar

You should see aspect execution in the log just before main() method:

[AppClassLoader@2437c6dc] info AspectJ Weaver Version 1.9.7 built on Thursday Jun 24, 2021 at 16:14:45 PDT
[AppClassLoader@2437c6dc] info register classloader jdk.internal.loader.ClassLoaders$AppClassLoader@2437c6dc
[AppClassLoader@2437c6dc] info using configuration file:/C:/Workspace/spring-aop-java-agent-inject-1.0.0.jar!/META-INF/aop.xml
[AppClassLoader@2437c6dc] info register aspect com.github.akazver.poc.SpringBootInterceptAspect
Jul 04, 2021 5:49:27 PM com.github.akazver.poc.SpringAopJavaAgent premain
INFO: Content of aop.xml:
<aspectj>
    <aspects>
        <aspect name="com.github.akazver.poc.SpringBootInterceptAspect"/>
    </aspects>
    <weaver options="-verbose -nowarn"/>
</aspectj>
[LaunchedURLClassLoader@610f7aa] info AspectJ Weaver Version 1.9.7 built on Thursday Jun 24, 2021 at 16:14:45 PDT
[LaunchedURLClassLoader@610f7aa] info register classloader org.springframework.boot.loader.LaunchedURLClassLoader@610f7aa
[LaunchedURLClassLoader@610f7aa] info using configuration file:/C:/Workspace/spring-aop-java-agent-inject-1.0.0.jar!/META-INF/aop.xml
[LaunchedURLClassLoader@610f7aa] info register aspect com.github.akazver.poc.SpringBootInterceptAspect
Jul 04, 2021 5:49:27 PM com.github.akazver.poc.SpringBootInterceptAspect execute
INFO: Hello from AspectJ

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v2.5.2)

2021-07-04 17:49:27.990  INFO 24572 --- [           main] com.example.demo.DemoApplication         : Starting DemoApplication using Java 11.0.9 on DESKTOP-VOL3PG3 with PID 24572 (C:\Workspace\demo-1.0.0.jar started by aka_zver in C:\Workspace)
2021-07-04 17:49:27.993  INFO 24572 --- [           main] com.example.demo.DemoApplication         : No active profile set, falling back to default profiles: default
2021-07-04 17:49:28.518  INFO 24572 --- [           main] com.example.demo.DemoApplication         : Started DemoApplication in 0.984 seconds (JVM running for 1.667)