Logging Session Scoped Bean Initialization Time

Question

I have an issue with my web application and I suspect that the session scoped beans are taking a long time to load.

Is there a way I can log how long the beans are taking to initialize?

*Is there a way I can log how long the beans are taking to initialize?* yes, in a `@PostConstruct` method. But since we don't have any code to inspect, we cannot say if the issue is there or somewhere else. — Luiggi Mendoza, Mar 09 '15 at 16:44

score 0 · Answer 1 · edited May 23 '17 at 12:30

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You could write a simple time logging mechanism along these lines setting the start time at the beginning of your constructor and the end time in a method annotated with @PostConstruct. This should give you a good idea how much time Spring takes to initialize your bean and wire up its dependencies.

edited May 23 '17 at 12:30

Community

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answered Mar 09 '15 at 16:57

Fritz Duchardt

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Does the constructor get called before or after the dependencies are injected? I need to include the dependency injection time as well in the initialized time that I am measuring. – DD. Mar 09 '15 at 17:01
Default constructor gets called before dependency injection – Fritz Duchardt Mar 10 '15 at 08:28

score 0 · Answer 2 · answered Mar 09 '15 at 17:43

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A simple log4j configuration should enable you to understand how long which bean(s) are taking. Set the logging level to DEBUG and use the date/time format in the log4j appender to print out the times.

answered Mar 09 '15 at 17:43

zoostar

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score 0 · Answer 3 · edited May 23 '17 at 12:06

SLF4j (that can easily be used with Spring: the reason why I found that) has a special TimeInstrument implementation for such purposes: [StopWatch]

Maybe this helps somebody, even though this question is a little old.

EDIT: The nice thing about it: it actually uses nanoTime() which is - according to these posts[1, 2] - the most precise solution.

(Code snippet from org.slf4j.profiler.StopWatch.start(String) )

public void start(String name) {
    this.name = name;
    startTime = System.nanoTime();
    status = TimeInstrumentStatus.STARTED;
}

Logging Session Scoped Bean Initialization Time

3 Answers3