[logback-user] Can logging configuration files be separated when using ContextJNDISelector?

Ville Hägg villeah at gmail.com
Thu Mar 21 11:12:56 CET 2013

Hi Ceki,

I believe I have successfully configured ContextJNDISelector because I
can see logfiles created with correct context name. Right?

Did you say that only one logback configuration file is currently
allowed and it is supposed to be shared by all applications using same
shared logging module? If so, it would explain my current challenges.
However I need to separate configuration files for each applications
somehow since there should be dozens of them deployed to the same
JBoss instance and managing them with one single config file is not

Here is my configuration and custom implementation for initializing
logback. Can you see something obviously wrong with it? I also
uploaded screenshots of status servlet outputs to my Picasa account:

In screenshots you can see what happens when I deploy webapp_B to the
environment where webapp_A already exists. As you can see, for some
reason there are logfile initializations from webapp_B configuration.
Also these log files exists in logging directory:
- webapp_A-daily-2013-03-21.0.log (pattern from webapp_A-logback.xml)
- webapp_B-daily-2013-03-21.0.log (pattern from webapp_A-logback.xml)
- webapp_B-d-2013-03-21.0.log (pattern from webapp_B-logback.xml)

Configurations and init routines:

web.xml (context name is changed depending of application):


LogbackConfigListener invokes LogbackConfigurator where I initialize logback:
        String configuration =
        addLogManagerInfoStatus("Initializing Logback instance using
configuration file: "
                + configuration);
        File resourceFile = new File(configuration);

        LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();
        JoranConfigurator configurator = new JoranConfigurator();
        try {
        } catch (Exception e) {
            addLogManagerErrorStatus("Cannot configure LogBack with file: '"
                    + configuration + "'. Log init failed!");

            throw new IllegalArgumentException(
                    "Cannot configure LogBack with file: '" + configuration
                            + "'", e);

        addLogManagerInfoStatus("Logback instance initialized
succesfully using configuration file: "
                + configuration);

<configuration scan="true" scanPeriod="30 seconds" debug="true">
	<appender name="SIFT-1" class="ch.qos.logback.classic.sift.SiftingAppender">

			<appender name="CommonFileAppender-${contextName}"
				<encoder class="ch.qos.logback.core.encoder.LayoutWrappingEncoder">
					<layout class="my.shared.logging.layout.ServiceLayout" />

				<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
    <!-- Define root logger to use Common logger -->
	<root level="DEBUG">
		<appender-ref ref="SIFT-1" />

webapp_B-logback.xml is otherwise the same, but it has SiftingAppender
named SIFT-2 AND filename pattern is a BIT DIFFERENT:


On Wed, Mar 20, 2013 at 9:56 PM, ceki <ceki at qos.ch> wrote:
> Hi Ville,
> It has been 3 full years since I've looked at
> JNDIBasedContextDiscriminator [1]. Looking at it again it lools like
> JNDIBasedContextDiscriminator code supposes that ContextJNDISelector
> has been previously installed and that there is only a single
> configuraton file for all applications. Have you installed
> ContextJNDISelector?
> Note that SiftingAppender could propbably fulfill the requirements of
> your use case with only a single logback configuration file without
> installing ContextJNDISelector. However, for that to work
> JNDIBasedContextDiscriminator would need to be (renamed and) modified
> to retreive its discriminating value directly from JNDI, something
> which is not hard to do.
> HTH,
> [1] http://goo.gl/BW3NA
> On 20.03.2013 19:29, Ville Hägg wrote:
>> Hi all,
>> I need to clarify if I have understood logging separation correctly.
>> I have almost the same scenario than described e.g. in this question:
>> http://mailman.qos.ch/pipermail/logback-user/2010-March/001442.html. In
>> my environment I have most of the application logic deployed to JBoss 7
>> as a JBoss module. Module have my shared libraries for common parts of
>> the application as well as third party libraries (like Logback and
>> Spring). My own custom shared implementations are using logging in a
>> standard way by instantiating loggers as a static class variables.
>> I am also having two war-applications which are using module described.
>> Requirement is to have own logging context for each of the application.
>> Which means applications should have their own log files, log levels and
>> root loggers etc. I have tried to introduce
>> JNDIBasedContextDiscriminator together with ShiftingAppender with no
>> luck. My problem is that after my applications are initialized, it seems
>> both of them is somehow sharing the same appenders. If I view status
>> messages servlet, I can see that application B have initialized also
>> RollingFileAppenders configured in application A's configuration file or
>> other way round. RollingFileAppenders are wrapped inside SiftingAppender
>> in both configuration files.
>> Can anyone clarify to me can two applications using shared libraries
>> have strictly separated configuration files which are introducing own
>> loggers, appenders and logging levels? Or do I still have some kind of
>> configuration problem with my setup?
>> Thanks a lot,
>> Ville
> --
> Ceki
> 65% of statistics are made up on the spot
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