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From Gary Gregory <garydgreg...@gmail.com>
Subject Re: Building log4j2 configuration files programmatically
Date Wed, 16 Nov 2016 19:59:39 GMT
Please have a look at:

org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilder.writeXmlConfiguration(OutputStream)

and

https://logging.apache.org/log4j/2.x/manual/customconfig.html

Gary

On Wed, Nov 16, 2016 at 9:59 AM, COHEN, STEVEN M <sc1478@att.com> wrote:

> We have the following requirements:
>
> There is a servlet that serves as a front end to many disparate EJBs.  The
> servlet reads the request parameters , decides which EJB they tell it to
> invoke, invoke that EJB from a JNDI lookup on the server.  Currently this
> is implemented on WebLogic, but we are trying to port it to JBoss.  And
> we'd also like it to use log4j2 rather than log4j.
>
> Both WebLogic and JBoss, and all application servers that I know of, have
> the same relationship to log4j:
>
> There is one Configuration per class loader.  That seems to be an
> immutable rule.  A Web App deployed in a War file has its own class
> loader.  An enterprise application deployed in an EAR file has its own
> class loader.  An EJB deployed as an EJB JAR seems to use the container's
> class loader.
>
> But here is the rub:
> We would like to have separate deployment of the EJBs.  These deployments
> in our organization are wrapped in RPMs , and they deploy the JEE archive
> (WAR, EAR, or EJB JAR) to the server using some script contained in the
> RPM.  Once deployed, the rpm postinstall script must also deploy the
> logging configuration file somewhere.  In order to achieve this separate
> deployment of EJBs, we have basically two choices:
>
> 1) Maintain the logging configuration of the master servlet webapp
> manually, adding appenders and loggers to the configuration file that also
> contains loggers and appenders for all the other EJBs run from this servlet
> and separately from the deployment of the EJB itself.
>
> 2) Develop some sort of scheme where each EJB "owns" a temporary logging
> configuration file in an intermediate directory.  When an RPM for one of
> the separately deployable EJBs is installed, launch a program that reads
> all the logging configuration files in the intermediate directory and
> writes out a new config file for the master servlet that includes the
> configs for all of these EJBs.
>
> In fact we have such a system already, written in-house many years ago,
> based on log4j-1.x.  It's rather crude, but it works.
>
> Is there a better way to do this in log4j2?  Is there a way to launch some
> sort of Builder that reads in a Configuration file, allows modification of
> the Configuration loaded and then writes the modified Configuration back to
> a disk file.  This would then cause the LoggerContext to update itself.
>
>
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