Dushyant Pandya created LOG4J2-540:
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Summary: Add an ability to load an alternative Log4j config file
Key: LOG4J2-540
URL: https://issues.apache.org/jira/browse/LOG4J2-540
Project: Log4j 2
Issue Type: Wish
Affects Versions: 2.0-beta9
Reporter: Dushyant Pandya
*Current Situation:*
In case of web applications, the Log4J2 loads a config file specified by the
servlet context init param *log4jConfiguration*. If the location is
*classpath:* location then that config file would be searched somewhere in the
classpath. Usually, to keep the web application WAR self sufficient the config
file is bundled in *WEB-INF/classes* dir of the WAR itself.
*Problem:*
The config file usually has machine/env dependent information like the log file
location, the log levels etc. These values and sometimes the whole file may be
different depending upon where the app is running (e.g., developer machine, qa
or production etc). In many organizations, the deployment scripts/tools specify
these files per env or alter the values per env during deployment time. This is
very difficult to do if the config file is bundled inside the WAR. An
alternative is to NOT bundle the config file inside WAR and put it in some
system classpath location but that solution makes the WAR not self contained.
*Wish:*
Wish there was an ability to specify a preferred log4j config file that will be
used if it exists and a fallback config file location if the preferred config
file doesn't exist.
For example, with the following in _web.xml_
{code}
<context-param>
<param-name>log4jConfiguration</param-name>
<param-value>file:///file1.xml,classpath:file2.xml</param-value>
</context-param>
{code}
The _file1.xml_ can be somewhere on external classpath location and could be
env specific. The _file2.xml_ can be the default file bundled in the WAR
itself. If _file1.xml_ exists then it will take the precedence, if it doesn't
exist then _file2.xml_ will be used. This idea is similar to the way _Spring
Framework_ allows specifying multiple values to the *location* attribute when
specifying [property
placeholder|http://docs.spring.io/spring/docs/4.0.1.RELEASE/spring-framework-reference/htmlsingle/#beans-factory-placeholderconfigurer].
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