Spring Aop logging line number incorrect

Question

I am using spring aop to do logging for my application : I have before after and afterthrowing advice configured but the line numbers that I see is not of the target class but that of the class used for logging How can I solve this Below is my configuration

Spring xml :

<aop:aspectj-autoproxy proxy-target-class="false" />

Class used for logging :

package com.digilegal.services.ahc.logging;

import java.lang.reflect.Modifier;
import org.apache.log4j.Logger;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;

@Aspect
public class AHCLogging {

    @Before("execution(* com.digilegal.services..*.*(..))")
    public void logBefore(JoinPoint joinPoint) {

        Logger log = Logger.getLogger(joinPoint.getTarget().getClass());
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();

        if (!Modifier.isPrivate(signature.getModifiers())
                && !signature.getName().startsWith("get")
                && !signature.getName().startsWith("set")
                && !signature.getName().startsWith("is")) {
            log.trace("ENTER METHOD ::"
                    + signature.getReturnType().getSimpleName() + " "
                    + signature.getName() + "("
                    + paramterType(signature.getParameterTypes()) + ")");
        }

    }

    @After("execution(* com.digilegal.services..*.*(..))")
    public void logAfter(JoinPoint joinPoint) {
        Logger log = Logger.getLogger(joinPoint.getTarget().getClass());
        MethodSignature signature = (MethodSignature)     joinPoint.getSignature();

        if (!Modifier.isPrivate(signature.getModifiers())
                && !signature.getName().startsWith("get")
                && !signature.getName().startsWith("set")
                && !signature.getName().startsWith("is")) {
            log.trace("EXIT METHOD ::"
                    + signature.getReturnType().getSimpleName() + " "
                    + signature.getName() + "("
                    + paramterType(signature.getParameterTypes()) + ")");
        }
    }

    @AfterThrowing(pointcut = "execution(* com.digilegal.services..*.*        (..))",throwing= "error")
    public void logAfterThrowing(JoinPoint joinPoint, Throwable error) {
        Logger log = Logger.getLogger(joinPoint.getTarget().getClass());
        MethodSignature signature = (MethodSignature)     joinPoint.getSignature();

        if (!Modifier.isPrivate(signature.getModifiers())
                && !signature.getName().startsWith("get")
                && !signature.getName().startsWith("set")
                && !signature.getName().startsWith("is")) {
            log.error("EXCEPTION IN METHOD ::"
                    + signature.getReturnType().getSimpleName() + " "
                    + signature.getName() + "("
                    + paramterType(signature.getParameterTypes()) + ")");
            log.error("Exception",error);
        }
    }

    private String paramterType(Class<?>[] classes) {
        StringBuffer buffer = new StringBuffer();
        String returnValue = "";

        for (Class<?> string : classes) {
            buffer.append(Modifier.toString(string.getModifiers()));
            buffer.append(" ");
            buffer.append(string.getSimpleName());
            buffer.append(",");
        }

        returnValue = buffer.toString();

        if (returnValue.trim().length() > 0) {
            returnValue = returnValue.substring(0, returnValue.length() -         1);
        }

        return returnValue;
    }
}

Am I missing something or is it suppose to be like this

Thanks

Nirav

Answer 1

I think this is not specifically a Spring AOP problem but just the way Log4j works, see Javadoc for PatternLayout:

L

Used to output the line number from where the logging request was issued.

WARNING Generating caller location information is extremely slow and should be avoided unless execution speed is not an issue.

So my recommendation is to use a pattern layout without line number and use Spring AOP's capability of determining line numbers, roughly like this:

joinPoint.getSourceLocation().getLine()