Spring aop is not getting triggerd for external jar method in spring boot application - spring-aop

Question

I am trying to have point cut for a method in jar and it is not getting triggered properly
I have my rest endpoint code as below :
package com.example.log.javatpoint;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
#RestController
public class Test{
#Autowired
Operation op;
private static final Logger LOG = LogManager.getLogger(Test.class);
#RequestMapping(value = "/customs", method = RequestMethod.GET)
public String custom() {
op.msg();
op.display();
LOG.info("Hello World");
LOG.info("Hello {0}", "World 2");
return "custom";
}
}
Operation class :
#Component
public class Operation{
public void msg(){System.out.println("msg() is invoked");}
public void display(){System.out.println("display() is invoked");}
}
#Aspect
#Component
public class TrackOperation
{
#Pointcut("execution(* Operation.*(..))")
public void abcPointcut(){}
#Around("abcPointcut()")
public Object myAdvice(ProceedingJoinPoint pjp) throws Throwable
{
System.out.println("Additional Concern Before calling actual method");
Object obj=pjp.proceed();
System.out.println("Additional Concern After calling actual method");
return obj;
}
#Pointcut("execution(* org.apache.logging.log4j.LogManager.info(..))")
public void abcPointcutLog(){}
#Around("abcPointcutLog()")
public Object myAdviceLog(ProceedingJoinPoint pjp) throws Throwable
{
System.out.println("Additional Concern Before calling actual method");
Object obj=pjp.proceed();
System.out.println("Additional Concern After calling actual method");
return obj;
}
}
Note : Point cut is working for Operation class where as point cut is not working for org.apache.logging.log4j.LogManager tried also providing org.apache.logging.log4j.Logger in point cut.
I expect the output as :
Additional Concern Before calling actual method
2019-09-24 12:28:58.540 INFO 10076 --- [nio-8080-exec-1] com.example.log.javatpoint.Test : Hello World
Additional Concern After calling actual method
Additional Concern Before calling actual method
2019-09-24 12:28:58.540 INFO 10076 --- [nio-8080-exec-1] com.example.log.javatpoint.Test : Hello {0}
Additional Concern After calling actual method
but the actual output is :
2019-09-24 12:28:58.540 INFO 10076 --- [nio-8080-exec-1] com.example.log.javatpoint.Test : Hello World
2019-09-24 12:28:58.540 INFO 10076 --- [nio-8080-exec-1] com.example.log.javatpoint.Test : Hello {0}

Answer 1

This question is a "classic" and has been asked so many times here already...
Please read the Spring AOP manual before using a tool you don't know. It will tell you that Spring AOP can only be applied to Spring components/beans, not to non-Spring POJOs. For that you need full AspectJ which you can use within Spring or completely without Spring.
Log4J classes are not Spring components, so the above applies to your situation. Here you find information about how to use AspectJ load-time weaving (LTW) instead of Spring AOP for your purpose.