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Posted to log4j-user@logging.apache.org by Steven J Saunders <st...@maccs.mq.edu.au> on 2001/09/10 08:11:42 UTC
Log4j in multiple Webapps under single JVM
Hi All,
I want to use Log4j to do logging in a J2EE webapp I am writing. I'm worried
about a couple of things though.
The webapp I am writing will be deployed multiple times inside a single JVM.
I want each separate webapp to log to a separate file, and I want to be able
to configure Log4j separately for each webapp.
Can this be done?
At the moment I'm using the following code in a servlet (loaded at startup)
to init Log4j:
String prefix = getServletContext().getRealPath("/");
String file = getInitParameter("log4j-init-file");
// if the log4j-init-file is not set, then no point in trying
if(file != null) {
PropertyConfigurator.configure(prefix+file);
System.out.println("***** Log4j Initialised *****");
}
If a second webapp is subsequently launched, will it's configuration clobber
the config of the first? What if I have a config file that looks something
like this:
log4j.category.<SOME UNIQUE WEBAPP-NAME HERE>=INFO, <WEBAPP-NAME AGAIN>
log4j.appender.<WEBAPP-NAME AGAIN>=org.apache.log4j.RollingFileAppender
log4j.appender.<WEBAPP-NAME AGAIN>.File=<WEBAPPNAME AGAIN>.log
Will that work? Can many webapps be loaded one after the other with config
files like the above without clobbering each other's configs?
Is there a better way to do this?
Thanks.
__
Steve Saunders
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RE: Log4j in multiple Webapps under single JVM
Posted by Ylan Segal <yl...@digiworks.tv>.
If you are using tomcat, each webapp works independently of the other, and
to my understanding it has it's own class loader separated from the other
webapps.
What I do is have log4j.jar in each webapps /WEB_INF/lib directory and the
use a different log4j.properties logging to a file appender (to a different
file).
Each app logs with it's own priority and categories without a problem.
I think this approeach should work for you also.
Ylan.
> -----Original Message-----
> From: Thomas Tuft Muller [mailto:ttm@online.no]
> Sent: Monday, September 10, 2001 12:38 AM
> To: LOG4J Users Mailing List
> Subject: RE: Log4j in multiple Webapps under single JVM
>
>
> You can have several "instances" of log4j running within a single VM by
> using multiple hierarchies. You better read the code for
> org.apache.log4j.Hierarchy to understand this fully.
>
> See org.apache.log4j.SocketServer for an example of how to configure and
> utilize multiple Hierarchy instances.
>
> Hope this helps
>
> --
>
> Thomas
>
>
>
> | -----Original Message-----
> | From: Steven J Saunders [mailto:steve@maccs.mq.edu.au]
> | Sent: 10 September 2001 07:12
> | To: log4j-user@jakarta.apache.org
> | Subject: Log4j in multiple Webapps under single JVM
> |
> |
> | Hi All,
> |
> | I want to use Log4j to do logging in a J2EE webapp I am writing.
> | I'm worried
> | about a couple of things though.
> |
> | The webapp I am writing will be deployed multiple times inside a
> | single JVM.
> | I want each separate webapp to log to a separate file, and I want
> | to be able
> | to configure Log4j separately for each webapp.
> |
> | Can this be done?
> |
> | At the moment I'm using the following code in a servlet (loaded
> | at startup)
> | to init Log4j:
> |
> | String prefix = getServletContext().getRealPath("/");
> | String file = getInitParameter("log4j-init-file");
> | // if the log4j-init-file is not set, then no point in trying
> | if(file != null) {
> | PropertyConfigurator.configure(prefix+file);
> | System.out.println("***** Log4j Initialised *****");
> | }
> |
> | If a second webapp is subsequently launched, will it's
> | configuration clobber
> | the config of the first? What if I have a config file that
> looks something
> | like this:
> |
> | log4j.category.<SOME UNIQUE WEBAPP-NAME HERE>=INFO, <WEBAPP-NAME AGAIN>
> | log4j.appender.<WEBAPP-NAME AGAIN>=org.apache.log4j.RollingFileAppender
> | log4j.appender.<WEBAPP-NAME AGAIN>.File=<WEBAPPNAME AGAIN>.log
> |
> | Will that work? Can many webapps be loaded one after the other
> with config
> | files like the above without clobbering each other's configs?
> |
> | Is there a better way to do this?
> |
> | Thanks.
> | __
> | Steve Saunders
> |
> |
> |
> | ---------------------------------------------------------------------
> | To unsubscribe, e-mail: log4j-user-unsubscribe@jakarta.apache.org
> | For additional commands, e-mail: log4j-user-help@jakarta.apache.org
> |
> |
>
>
>
> *************************************************************************
> Copyright ERA Technology Ltd. 2001. (www.era.co.uk). All rights reserved.
> Confidential. No liability whatsoever is accepted for any loss or damage
> suffered as a result of accessing this message or any attachments.
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: log4j-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: log4j-user-help@jakarta.apache.org
>
>
---------------------------------------------------------------------
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RE: Log4j in multiple Webapps under single JVM
Posted by Thomas Tuft Muller <tt...@online.no>.
You can have several "instances" of log4j running within a single VM by
using multiple hierarchies. You better read the code for
org.apache.log4j.Hierarchy to understand this fully.
See org.apache.log4j.SocketServer for an example of how to configure and
utilize multiple Hierarchy instances.
Hope this helps
--
Thomas
| -----Original Message-----
| From: Steven J Saunders [mailto:steve@maccs.mq.edu.au]
| Sent: 10 September 2001 07:12
| To: log4j-user@jakarta.apache.org
| Subject: Log4j in multiple Webapps under single JVM
|
|
| Hi All,
|
| I want to use Log4j to do logging in a J2EE webapp I am writing.
| I'm worried
| about a couple of things though.
|
| The webapp I am writing will be deployed multiple times inside a
| single JVM.
| I want each separate webapp to log to a separate file, and I want
| to be able
| to configure Log4j separately for each webapp.
|
| Can this be done?
|
| At the moment I'm using the following code in a servlet (loaded
| at startup)
| to init Log4j:
|
| String prefix = getServletContext().getRealPath("/");
| String file = getInitParameter("log4j-init-file");
| // if the log4j-init-file is not set, then no point in trying
| if(file != null) {
| PropertyConfigurator.configure(prefix+file);
| System.out.println("***** Log4j Initialised *****");
| }
|
| If a second webapp is subsequently launched, will it's
| configuration clobber
| the config of the first? What if I have a config file that looks something
| like this:
|
| log4j.category.<SOME UNIQUE WEBAPP-NAME HERE>=INFO, <WEBAPP-NAME AGAIN>
| log4j.appender.<WEBAPP-NAME AGAIN>=org.apache.log4j.RollingFileAppender
| log4j.appender.<WEBAPP-NAME AGAIN>.File=<WEBAPPNAME AGAIN>.log
|
| Will that work? Can many webapps be loaded one after the other with config
| files like the above without clobbering each other's configs?
|
| Is there a better way to do this?
|
| Thanks.
| __
| Steve Saunders
|
|
|
| ---------------------------------------------------------------------
| To unsubscribe, e-mail: log4j-user-unsubscribe@jakarta.apache.org
| For additional commands, e-mail: log4j-user-help@jakarta.apache.org
|
|
*************************************************************************
Copyright ERA Technology Ltd. 2001. (www.era.co.uk). All rights reserved.
Confidential. No liability whatsoever is accepted for any loss or damage
suffered as a result of accessing this message or any attachments.
---------------------------------------------------------------------
To unsubscribe, e-mail: log4j-user-unsubscribe@jakarta.apache.org
For additional commands, e-mail: log4j-user-help@jakarta.apache.org