Question

I have a log4j properties file. on application start up i need to set value for one of the property. is it possible? because i know the value for the property on application start up only.

log4j.properties
----------------

Environment = ${env}

Thanks!

Answer 1

java -DEnvironment=dev <YourMainProgram>

then in log file you can call that variable as

log4j.appender.logfile.File=appname-${Environment}.log

Edit:

Tomcat: If application is running in Tomcat you can define environment in Catalina.bat.

Open the “Catalina.bat” file placed in the “bin” directory.

 set CATALINA_OPTS=" -DEnvironment=dev"

Then Restart your server by Catalina.bat.