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Asked: 2026-05-11T07:29:07+00:00

I am planning to implement logging into a web application that I am currently

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I am planning to implement logging into a web application that I am currently working on but I am struggling with some of the details. What is the best way to go about logging a Java web application?

Specifically;

  • Where does the configuration file go in .war package file?
  • Where do people log to, relative or absolute path flat file, or a database?
  • Does Log4J logging go directly into the application server log file automatically or is that something you have to set up? In this case I am using Tomcat, but I often use Jrun.
  • Any other gotchas I should be aware of for web application logging?

Currently I am using Log4J but I imagine that the best practices would apply universally to all logging implementations.

EDIT:
One addition to the questions up top.

  • Where do you initilize the log configuration?

In a traditional app, I do this at the entry point;

DOMConfigurator.configureAndWatch('log4j.xml');

What would the web application equivalent be?

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1 Answer

  1. I place my configuration on the default package: src/

    and log to files using the ${catalina.home} system property:

    log4j.appender.???.file=${catalina.home}/logs/system.log
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