Need a logging package that will log the stacktrace

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Dean Schulze - 17 Jan 2006 16:25 GMT

Is there a Logger that will easily log my stacktrace (what I get with
ex.printStackTrace())? I've searched the log4j docs and found nothing
about logging the stacktrace.

I can do this myself with

    StringWriter sw = new StringWriter();
    ex.printStackTrace(new PrintWriter(sw));
    String stacktrace = sw.toString();
    logger.error(stacktrace);

but I don't want to duplicate this code all over the place.

If log4j won't do this for me is there another logging package that will
log the stacktrace for me?

Thanks.

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Joe Attardi - 17 Jan 2006 16:40 GMT

Hey Dean,

Worst case, you could just have a helper class with a static method to
log the stack trace. It could be something like

public class ExceptionLogger {
public static void logException(Logger logger, Throwable ex) {
StringWriter sw = new StringWriter();
ex.printStackTrace(new PrintWriter(sw));
String stacktrace = sw.toString();
logger.error(stacktrace);
}
}

then in your code wherever you need to log it, just call
ExceptionLogger.logException(logger, ex);

What do you think of that approach?

-- Joe Attardi

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Dean Schulze - 17 Jan 2006 17:06 GMT

That will cut down on code duplication.

I'm surprised that the standard and defacto standard logging APIs don't
include the stacktrace. I thought there'd be one out there that did this.

> Hey Dean,
>
[quoted text clipped - 16 lines]
>
> -- Joe Attardi

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Daniel Dyer - 17 Jan 2006 17:21 GMT

> That will cut down on code duplication.
>
> I'm surprised that the standard and defacto standard logging APIs don't
> include the stacktrace. I thought there'd be one out there that did
> this.

If you look at the Log4J API docs you will see that each of the trace,
debug, info, warn, error and fatal methods are overloaded with a version
that takes two parameters, the second parameter being a Throwable. These
overloaded methods will output the stack trace from that Throwable along
with the message that you pass in the first parameter.

Dan.

Signature

Daniel Dyer
http://www.dandyer.co.uk

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Patrick May - 17 Jan 2006 21:33 GMT

> > I'm surprised that the standard and defacto standard logging APIs
> > don't include the stacktrace. I thought there'd be one out there
[quoted text clipped - 6 lines]
> from that Throwable along with the message that you pass in the
> first parameter.

The java.util.logging.Logger class has this capability as well if
you use the log(Level,String,Throwable) method instead of the
convenience methods.

Regards,

Patrick

------------------------------------------------------------------------
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Dean Schulze - 18 Jan 2006 00:16 GMT

That worked. Thanks.

I knew I had seen stack traces in .log files, but their API isn't very
intuitive.

>> That will cut down on code duplication.
>>
[quoted text clipped - 10 lines]
>
> Dan.

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Need a logging package that will log the stacktrace

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