Spring AOP @注释

Question

I'm newbie in AOP especially in Spring AOP.

I want to log execution time in some specific method. I read Spring documentation and considered that the best solution is to create aspect with annotation pointcut.

It looks like:

@Around("@annotation(com.x.y.MethodExecutionTime)")
public Object methodExecutionTimeLog(ProceedingJoinPoint joinPoint) throws Throwable 
    StopWatch stopWatch = new StopWatch();

    Object retVal = null;
    try {
        stopWatch.start();
        retVal = joinPoint.proceed();
        stopWatch.stop();
        logger.info("Execution time: " + stopWatch.getTotalTimeMillis() + " ms");
    } catch(Throwable e) {
        logger.error("Execution time: " + stopWatch.getTotalTimeMillis() + " ms");
        throw e;
    }
    return retVal;
}

Annotation is used in method:

    @Override
@MethodExecutionTime
public <T> T copy(Class<T> destType) {

    T t = ReflectionHelper.newInstance(destType);

    copyTo(t);

    return t;
}

Spring XML configuration:

<context:spring-configured />
<aop:aspectj-autoproxy proxy-target-class="true" />

but it logs nothing.

I'm using Spring 3.0.5

Any ideas? Thanks

Answer 1

If everything else is configured properly, it should be one of the limitations of Spring AOP (at least, of its default configuration), namely:

• Object to apply the aspect to should be managed by Spring (ie it should be obtained from the application context, not created with new )

• Call should originate from the "outside" of that object, ie aspects are not applied when you call another method of the same object

• <aop:aspectj-autoproxy> should be declared in the same application context as the object to apply the aspect to (in particular, in a typical Spring Web MVC application applicationContext.xml and ...-servlet.xml form different application contexts)