Question

I have a Spring application that I believe has some bottlenecks, so I’d like to run it with a profiler to measure what functions take how much time. Any recommendations to how I should do that?

I’m running STS, the project is a maven project, and I’m running Spring 3.0.1

Answer 1

I’ve done this using Spring AOP.

Sometime I need an information about how much time does it take to execute some methods in my project (Controller’s method in example).

In servlet xml I put

<aop:aspectj-autoproxy/>

Also, I need to create the class for aspects:

@Component
@Aspect
public class SystemArchitecture {

    @Pointcut("execution(* org.mywebapp.controller..*.*(..))")
    public void businessController() {
    }
}

And profiler aspect:

@Component
@Aspect
public class TimeExecutionProfiler {

    private static final Logger logger = LoggerFactory.getLogger(TimeExecutionProfiler.class);

    @Around("org.mywebapp.util.aspects.SystemArchitecture.businessController()")
    public Object profile(ProceedingJoinPoint pjp) throws Throwable {
        long start = System.currentTimeMillis();
        logger.info("ServicesProfiler.profile(): Going to call the method: {}", pjp.getSignature().getName());
        Object output = pjp.proceed();
        logger.info("ServicesProfiler.profile(): Method execution completed.");
        long elapsedTime = System.currentTimeMillis() - start;
        logger.info("ServicesProfiler.profile(): Method execution time: " + elapsedTime + " milliseconds.");

        return output;
    }

    @After("org.mywebapp.util.aspects.SystemArchitecture.businessController()")
    public void profileMemory() {
        logger.info("JVM memory in use = {}", (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()));
    }
}

That’s all.
When I request a page from my webapp, the information about method executing time and JVM memory usage prints out in my webapp’s log file.