Yes, Yuk indeed.
So just to clarify, you recommend using log4j, and replacing all my
printStackTrace with log4j specific code. Would that be correct?
Cheers,
Alec
On Wed, Nov 27, 2013 at 12:18 PM, Christopher Schultz <
ch...@christopherschultz.net> wrote:
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> Alec,
>
> On 11/27/13, 11:45 AM, Tomcat Random wrote:
> > I'm running Tomcat 7.0.42 on RHEL. Currently all my exceptions are
> > handled with e.printStackTrace() and go to catalina.out, which
> > doesn't rotate.
>
> Yuk.
>
> > Could someone be so kind as to recommend a better way to handle
> > logging, with specific steps.
>
> Yes and no. How to handle logging? Use a logging framework. log4j,
> java.logging are popular and there are others. I find java.logging to be
> ... frankly frustrating to configure. I would recommend log4j.
>
> As for API, both Apache commons-logging and slf4j are popular. Note that
> you need a "real" logging framework underneath to actually do the
> logging. I'm not sure if it's worthwhile adding that extra layer rather
> than simply coding directly to the logging framework's API. I have used
> log4j directly for years and I'm quite happy.
>
> The biggest problem is that you are going to have to modify a lot of
> your code. Every modification is trivial and easy, but if you are
> logging properly, then you probably have a big job ahead of you. Since
> you aren't using a logging framework, you probably don't have trace,
> debug, etc. logging so that makes things a bit easier... you just have
> to grep for "printStackTrace" and replace that with something like
> "logger.error("Bad stuff", exception);".
>
> > Daily error logs would be a good start, instead of one giant
> > catalina.out file.
>
> Any logging framework will be able to roll your files for you. Just read
> the docs for how to configure them to behave that way.
>
> There is a stop-gap measure if you are running on a reliable system:
> you can modify catalina.sh (or however you launch Tomcat) to pipe
> stdout to a program like chronolog instead of redirecting to a file.
> Chronolog was made to take stdin and write to a rolling file. I'm sure
> a setup like that is a big fragile, so keep your eyes on it. But it
> can get you out of a bind while you re-work your application to log
> properly.
>
> - -chris
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