It should work to define the common stuff as properties and reference
them further down the file. So...
appenderClass=org.apache.log4j.RollingFileAppender
...
...
log4j.appender.tuxcat=${appenderClass}
Just apply the same thing to all the other common stuff. I haven't
tried this, so I can't guarantee it will work. I think Log4j only
looks for properties starting with "log4j.", so Log4j should ignore
declarations the other properties. And I'm pretty sure that you can
refer to a local property in the same property file using the
${propname} syntax.
I'm not sure what equivalent would be for XML. You couldn't do this
other than using system properties with Log4j-1.2.xx. I'm not sure
about 1.3. You might be able to write Joran rules to store the
properties and use their values later in the file. Not sure?
Jake
At 07:32 AM 11/10/2006, you wrote:
>Hi,
>
>I've got Tomcat 5.5 set up to use Log4j for logging. (I'm more
>comfortable with that than JULI.)
>
>In short, I want one log file per vhost. My current system is rather
>crude, I think: have one RollingFileAppender per vhost, and the logger
>for that vhost referring to this appender:
>
>log4j.rootLogger=WARN, R
>log4j.appender.R=org.apache.log4j.RollingFileAppender
>log4j.appender.R.File=${catalina.base}/logs/tomcat.log
>log4j.appender.R.MaxFileSize=10MB
>log4j.appender.R.MaxBackupIndex=10
>log4j.appender.R.layout=org.apache.log4j.PatternLayout
>log4j.appender.R.layout.ConversionPattern=%p %t %c - %m%n
>log4j.logger.org.apache.catalina=INFO, R
>
>log4j.logger.org.apache.catalina.core.ContainerBase.[Catalina].[localh
>ost]=INFO,
>localhost
>log4j.appender.localhost=org.apache.log4j.RollingFileAppender
>log4j.appender.localhost.File=${catalina.base}/logs/localhost.log
>log4j.appender.localhost.MaxFileSize=10MB
>log4j.appender.localhost.MaxBackupIndex=10
>log4j.appender.localhost.layout=org.apache.log4j.PatternLayout
>log4j.appender.localhost.layout.ConversionPattern=%p %t %c - %m%n
>
>log4j.logger.org.apache.catalina.core.ContainerBase.[Catalina].[www.tu
>xcat.local]=INFO,
>tuxcat
>log4j.appender.tuxcat=org.apache.log4j.RollingFileAppender
>log4j.appender.tuxcat.File=${catalina.base}/logs/tuxcat.log
>log4j.appender.tuxcat.MaxFileSize=10MB
>log4j.appender.tuxcat.MaxBackupIndex=10
>log4j.appender.tuxcat.layout=org.apache.log4j.PatternLayout
>log4j.appender.tuxcat.layout.ConversionPattern=%p %t %c - %m%n
>
>log4j.logger.org.apache.catalina.core.ContainerBase.[Catalina].[www.sc
>iencemapper.local]=INFO,
>sciencemapper
>log4j.appender.sciencemapper=org.apache.log4j.RollingFileAppender
>log4j.appender.sciencemapper.File=${catalina.base}/logs/sciencemapper.log
>log4j.appender.sciencemapper.MaxFileSize=10MB
>log4j.appender.sciencemapper.MaxBackupIndex=10
>log4j.appender.sciencemapper.layout=org.apache.log4j.PatternLayout
>log4j.appender.sciencemapper.layout.ConversionPattern=%p %t %c - %m%n
>
>
>As you can see, most of this stuff is constantly duplicated: the
>appender class, max file size and backup index, and the layout. The only
>thing that changes between appenders is the file name.
>
>Is there a way to make this simpler? Either by having a single appender
>that switches file name depending on the logger that calls it (unlikely
>that this is possible) or by having appender defaults/prototypes so I
>don't have to repeat the configuration all the time?
>
>If that's not possible in 1.2, will it be in 1.3's XML configuration?
>(Can't use 1.2's XML configuration with Tomcat's vhost loggers.) Would
>it be too late for a feature request?
>
>Sebastian Redl
>
>
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