Re[2]: Multiple Log4J instances in one VM

[Jacob Kjome <ho...@visi.com>]

Hello sanjayrajsoni,

Logging with separate logger repositories (hierarchies) using a logger repository
selector is log4j's way of dealing with this.  It works quite nicely,
if you ask me.  It allows you to configure each individual logger
repository without treading on any other.  See Ceki's doc here:
http://qos.ch/containers/

There he describes logger repositories keyed on classloader which
works fantastically in servers like Tomcat-4.1.xx.  For other servers
such as Jboss which, apparently, uses a common classloader for the
whole server (am I right about that?), this method might not work
quite right.  However, you can create a custom logger repository
selector to key on anything you want.

It would be nice if Log4j could come up with a standard repository
selector that worked in a standard way in all environments.  That's
probably what people are looking for.

Jake

Tuesday, December 03, 2002, 1:01:35 PM, you wrote:

s> We also ran into the same issue and is causing many headaches 
s> prompting some team-members to insist that we get rid of Log4J. Log4J 
s> being open-source is used by different teams/companies who have no 
s> cooridnation between them. I hope in the future releases this problem 
s> can be solved.

s> --- In Log4J@y..., "Thomas Muller" <tt...@o...> wrote:
>> Log4j's somewhat static configuration approach strikes me as quite
>> non-object-oriented since it in many ways violates encapsulation and
>> instantiation; a natural requirement for a logging API is that 
s> different
>> parts of a program (running in the same VM) should be able to 
s> configure
>> their own "instances" of Log4j independent of eachother, e.g. they 
s> should
>> not need to ask eachother or the API itself whether it's configured.
>> 
>> Everything considered, it seems like getting Log4j to work smoothly 
s> (as is)
>> in a multiple configuration environemt is a cumbersome and 
s> unintuitive task,
>> and clearly needs to be addressed in later versions.
>> 
>> --
>> 
>> Thomas
>> 
>> 
>>  | -----Original Message-----
>>  | From: Ceki Gulcu [mailto:ceki@q...]
>>  | Sent: 07 August 2002 09:17
>>  | To: Log4J Users List
>>  | Subject: RE: Multiple Log4J instances in one VM
>>  |
>>  |
>>  |
>>  | Hmm, that is not it either. I was thinking of simply checking 
s> whether
>>  | log4j is already configured. If a component detects that log4j is
>>  | configured, it should not configure log4j.
>>  |
>>  | Here is a more elaborate explanation:
>>  |
>>  | http://marc.theaimsgroup.com/?l=log4j-user&m=102775658930710&w=2
>>  |
>>  |
>>  | At 09:01 07.08.2002 +0100, you wrote:
>>  | >As Ceki points out, there are other ways of solving this, e.g. 
s> by using
>>  | >different hierarchies for the different "programs".
>>  | >
>>  | >See e.g. org.apache.log4j.net.SocketServer for an example of
>>  | how to obtain
>>  | >this.
>>  | >
>>  | >--
>>  | >
>>  | >Thomas
>>  | >
>>  | >
>>  | >
>>  | >  | -----Original Message-----
>>  | >  | From: Thomas Muller [mailto:ttm@o...]
>>  | >  | Sent: 07 August 2002 08:22
>>  | >  | To: Log4J Users List
>>  | >  | Subject: RE: Multiple Log4J instances in one VM
>>  | >  |
>>  | >  |
>>  | >  |
>>  | >  |
>>  | >  |  | -----Original Message-----
>>  | >  |  | From: Hitzbleck, Andreas (ext. Mitarbeiter)
>>  | >  |  | [mailto:Andreas.Hitzbleck@K...]
>>  | >  |  | Sent: 07 August 2002 08:18
>>  | >  |  | To: 'log4j-user@j...'
>>  | >  |  | Subject: Multiple Log4J instances in one VM
>>  | >  |  |
>>  | >  |  |
>>  | >  |  | Hello list,
>>  | >  |  |
>>  | >  |  | I am developing a java program which is integrated in a
>>  | big content
>>  | >  |  | management system. Thus, our code runs with some other
>>  | java programs
>>  | >  |  | developed by other companies in one virtual mashine.
>>  | >  |  |
>>  | >  |  | Unfortunately, the Log4J initialization of one program 
s> of another
>>  | >  |  | company overwrites our Log4J configuration or - if we 
s> start up
>>  | >  |  | our program later - vice versa. I think that is because 
s> of the
>>  | >  |  | statically implementation(s) of the configure() methods 
s> in
>>  | >  |  | Property- Basic- and DOMConfigurator?
>>  | >  |  |
>>  | >  |  | Is there a way to solve this problem or to work around 
s> it? Would
>>  | >  |  | it help to implement my own classloader and load the
>>  | Log4J classes
>>  | >  |  | through this loader?
>>  | >  |
>>  | >  | Yes - different classloaders can utilize different log4j
>>  | libraries and
>>  | >  | configurations.
>>  | >  |
>>  | >  | --
>>  | >  |
>>  | >  | Thomas
>>  | >  |
>>  | >  |
>>  | >  |
>>  | >  |
>>  | >  |
>>  | >  |
>>  | >  |
>>  | 
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>> --
>> Ceki
>> 
>> 
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s> ***
>> Copyright ERA Technology Ltd. 2002. (www.era.co.uk). All rights 
s> reserved. 
>> The information supplied in this email should be treated in 
s> confidence.
>> No liability whatsoever is accepted for any loss or damage 
>> suffered as a result of accessing this message or any attachments.
>> 
>> 
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-- 
Best regards,
 Jacob                            mailto:hoju@visi.com


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