Oh ok.... now I understand.
Thank you.
--Kawthar
>>> [EMAIL PROTECTED] 02/04/2004 12:15:20 PM >>>
On Fri, 2004-04-02 at 16:01, Kawthar Bt M Sulaiman wrote:
> Hi,
>
> In this file, there's:
>
> log4j.rootCategory=debug, MO ----> <first>
>
> Then,
>
> log4j.appender.MO=org.apache.log4j.DailyRollingFileAppender
> log4j.appender.MO.Threshold=DEBUG. -----> <second>
> ...
>
> My question, is the debug <on first> and <debug on second> has the
> same
> meaning? So, if I just want to log INFO and above, do I change the
> Threashold=INFO only or both?
When some code logs a message, it specifies a priority and a category.
If the message priority is less than the category priority, then the
message is totally ignored.
Once the message gets past that first cutoff, some significant work
gets
done (creating a LogEvent object etc), then the message is sent on to
each appender (ie "outputter") associated with the category.
If any of those appenders has a threshold set, then that appender
discards (ignores) the message if its priority is less than the
threshold.
So this allows you to say:
* category X has two appenders: file and email
* for category X, ignore everything lower than INFO
* for the file appender, accept all that pass the category priority
(ie no threshold set)
* for the email appender, ignore those messages which got past the
category filtering, but are lower than WARN
It is more efficient to filter at the category level than the appender
level, but if you want different amounts of detail written to different
appenders for the same category, then the threshold setting allows you
to do this.
Cheers,
Simon
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