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From Janne Jalkanen <>
Subject Re: Restart logging?
Date Mon, 07 Sep 2009 06:25:58 GMT

I don't think there's a simple way to do that through slf4j, simply  
because log configuration is very specific to the actual logging  
library used. For example, java.util.logging has a single global  
LogManager, and to restart that one would mean writing our own  

However, since this is about first-use experience, it's unlikely that  
someone would both be savvy enough to first switch the logging library  
- THEN go and apply the easy-install process. So we might get away  
simply by reconfiguring whichever logging library we happen to be  
shipping with.

Another possibility is to switch to Simple logging, which always goes  
to stdout - in Tomcat's case, catalina.out.  Then there would be no  
need to provide configuration on Install.jsp, which would simplify our  
install process even more.


On 7 Sep 2009, at 00:52, Andrew Jaquith wrote:

> Hi Harry,
> The idea is to configure the wiki, including logging settings, using
> the installer screen. Then, after pressing the "Configure!" button,
> presto! the wiki is configured the way it should be without needing to
> restart the webapp. Instant gratification! It is much better than
> having to restart the webapp.
> Right now, in my local builds, everything *except* the log file change
> seems to work fine. The goal is to have the desired log file location
> (configured via the installer) reflected immediately -- the logs start
> going to that file. So I want to know how best to do that. Whether it
> is JMX or whatever, I don't care. But I am not a logging expert; hence
> the broadcast. If you have ideas I'd like to hear about them.
> Andrew
> On Sun, Sep 6, 2009 at 12:45 PM, Harry  
> Metske<> wrote:
>> Well,
>> we have our own logging layer ( which talks to  
>> slf4j
>> which talks to a real logging implementation (with log4j as the  
>> default).
>> The first two don't have support for configuring logging at all,  
>> the writer
>> of slf4j says you also shouldn't :
>> Log4j itself does support dynamic configuration of logging, but  
>> that has
>> explicitly not been put in the slf4j interface.
>> We do however have some way of dynamically configuring our loggers,  
>> and
>> that's through the MBeans (currently you have to use jconsole to do  
>> it, but
>> a nice GUI for it would still be nice). This is however limited.
>> So with "restart logging" you could something in that direction,  
>> but again,
>> that is limited to log4j, if you run another logging  
>> implementation, you are
>> left alone in the dark.
>> BTW, what exactly would be the difference between restarting the  
>> engine and
>> reloading the whole webapp ?
>> regards,
>> Harry
>> 2009/9/6 Andrew Jaquith <>
>>> Hi all --
>>> I am doing a bunch of work on the installer/config code. I've  
>>> already
>>> got some really cool features implemented (LDAP config and live
>>> testing, Stripesification of the interface, configuration of  
>>> multiple
>>> properties files simultaneously...). One thing I would REALLY like  
>>> to
>>> do is to be able to apply changes to the wiki WITHOUT requiring a
>>> webapp reload.
>>> To that end, I wrote a restart() method for the WikiEngine, and it
>>> seems to work perfectly except in one respect: I can't figure out  
>>> how
>>> to restart the logging subsystem. Any hints? I'd like to be able to
>>> allow the admin to specify the desired log file location, and after
>>> restart all of the logging is redirected there.
>>> Actually, there is one more thing: how does one set the Priha page
>>> directory? I'm pretty sure there's a setting in  
>>> that
>>> needs to be set, but I don't know what it is.
>>> Andrew

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