Hello,
My application has several dependencies, some of which have other
dependencies. I am using Log4j2 for logging and wanted to separate
application logs from dependency logs.
Below is my log4j2.xml
<?xml version="1.0" encoding="UTF-8"?>
<Configuration>
<Properties>
<property name="rollSuffix">%d{yyyyMMdd}</property>
<property name="commonPattern">%d %level %class %method -
%msg%n</property>
</Properties>
<Appenders>
<RollingFile name="xLog"
fileName="x.log"
filePattern="x-${rollSuffix}.log"
immediateFlush="true" >
<PatternLayout pattern="${commonPattern}" />
<Policies>
<TimeBasedTriggeringPolicy interval="1" modulate="true" />
</Policies>
</RollingFile>
<RollingFile name="yLog"
fileName="y.log"
filePattern="y-${rollSuffix}.log"
immediateFlush="true" >
<PatternLayout pattern="${commonPattern}" />
<Policies>
<TimeBasedTriggeringPolicy interval="1" modulate="true" />
</Policies>
</RollingFile>
<RollingFile name="zLog"
fileName="z.log"
filePattern="z-${rollSuffix}.log"
immediateFlush="true" >
<PatternLayout pattern="${commonPattern}" />
<Policies>
<TimeBasedTriggeringPolicy interval="1" modulate="true" />
</Policies>
</RollingFile>
<RollingFile name="appLog"
fileName="app.log"
filePattern="app-${rollSuffix}.log"
immediateFlush="false" >
<PatternLayout pattern="%d %-5p - %m%n" />
<Policies>
<TimeBasedTriggeringPolicy interval="1" modulate="true" />
</Policies>
</RollingFile>
</Appenders>
<Loggers>
<Logger name="com.x" level="error" additivity="false" >
<AppenderRef ref="xLog" />
</Logger>
<Logger name="io.y" level="error" additivity="false" >
<AppenderRef ref="yLog" />
</Logger>
<Logger name="org.z" level="error" additivity="false" >
<AppenderRef ref="zLog" />
</Logger>
<Root level="all">
<AppenderRef ref="appLog" />
</Root>
</Loggers>
</Configuration>
As you can see, for each x, y, z, etc modules, I have defined an appender
and a logger. This made the xml too long and maintenance has become more
and more difficult.
I have some questions:
1. I had found out that multiple loggers should not refer to same file
appender (e.g. FileAppender, RollingFileAppender etc). Is it still valid
for latest versions?
2. Is there a way to shrink the xml by reducing both appenders and loggers?
3. Is it a feasible feature for log4j2 so that a logger can have multiple
names? (I am thinking about requesting the feature)
For example:
<Logger level="error" additivity="false" >
<Names>
<Name name="com.x" />
<Name name="io.y" />
<Name name="org.z" />
</Names>
<AppenderRef ref="xLog" />
</Logger>
Regards,
sazzad
