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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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