JBoss 6 logging and MDC

[chris.jansen]

Hello all,

I am having problems getting the new JBoss logging service to output MDC values in a log file.

I thought that it may be an issue with the standard file appender, so I followed the steps in the issue https://issues.jboss.org/browse/JBAS-8791 to enable the use of log4j appenders. This didn't solve the problem.

I believe the issue may be with the default JBoss 6 pattern layout, but as jboss-logging no longer allows you to specify the pattern layout class that the appender uses I cannot test this theory.

My formatter pattern is:

%d %-5p [%c] (%t) [%X{user} %X{task}] - %s%E%n"

Has anyone else found this problem and know of a fix or can anyone offer any advice on the subject?

Many thanks,

Chris

[chris.jansen]

Solved - I was using org.jboss.logging.MDC, where I should have been using org.jboss.logmanager.MDC to make the MDC entries appear.

[jaikiran]

Chris, would you mind creating a wiki article to explain the configs that you used to get this working in AS6? There's not much user examples around jboss-logging for AS6, so any info like this is going to help other users.

[chris.jansen]

Hi Jaikiran,

How would you like the wiki entry to be written, would you like some example code and show some sample jboss-logging.xml configuration that will work with the code?

Regards,

Chris

[jaikiran]

Chris Jansen wrote:

would you like some example code and show some sample jboss-logging.xml configuration that will work with the code?

Yes, that would be great!

[chris.jansen]

It appears that org.jboss.logging.MDC works also, where I was seeing the problem was where I was using org.apache.log4j.MDC. So either org.jboss.logging.MDC or org.jboss.logmanager.MDC will work in place of org.apache.log4j.MDC.

[chris.jansen]

Hi Jaikiran,

Here is the wiki article as requested, is it OK? http://community.jboss.org/wiki/UsingMDCinJBossapplications

Regards,

Chris

[jaikiran]

Excellent! Thanks for creating it. I've linked it to our JBoss AS6 FAQ http://community.jboss.org/wiki/JBossAS6FAQ

[chris.jansen]

No problem, I'm glad i could help out!

[nickarls]

I'm having trouble with MDCs in my custom log4j appender. I got MDC working in general by upgrading log4j to .16 and after that I can access %X{foo} fine in my console appender but the same event being logged to my custom appender ends up with a loggingEvent.getMDC("foo") as null. Any theories?

[chris.jansen]

It's possibly due to an incompatibility between JBoss logging on log4j (which is why the log4j MDC didn't work from me). The issue https://issues.jboss.org/browse/JBLOGGING-54 is still open fore this reason. It may be worth dropping a comment on there to see if the problem you are having is the same issue.

[nickarls]

Thanks for the info, I updated the JIRA. It appears as the event.getMDC() isn't connected to the jboss MDC properly since I can use MDC.get() but not event.getMDC().get()...

[markknowles]

https://issues.jboss.org/browse/JBLOGGING-54 indicates that this issue was fixed in Jboss Logging  3.0.0.GA . However, I still see this issue in 3.0.1.GA. (I am using jboss-as-web-7.0.2.Final, which contains modules\org\jboss\logging\main\jboss-logging-3.0.1.GA.jar). The workaround (use org.jboss.logging.MDC) works fine.