Configuration file :: Apache Log4j

Using a configuration file is the most popular and recommended approach for configuring Log4j Core. In this page we will examine the composition of a configuration file and how Log4j Core uses it. If you are looking for a quick start on using Log4j in your application or library, please refer to Getting started instead.

[yyamano]

“sys System properties. The formats are ${sys:some.property} and ${sys:some.property:-default_value}.”