jcabi-log – Multicolor Layout for LOG4J

Multicolor Layout for LOG4J

Configure it in your log4j.properties:

log4j.rootLogger=INFO, CONSOLE
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=com.jcabi.log.MulticolorLayout
log4j.appender.CONSOLE.layout.ConversionPattern=[%color{%-5p}] %c: %m%n

Or in XML config:

<appender name="consoleAppender" class="org.apache.log4j.ConsoleAppender">
  <layout class="com.jcabi.log.MulticolorLayout">
    <param name="ConversionPattern" value="[%color{%-5p}] %c: %m%n" />
  </layout>
</appender>

In version 0.9 there is an ability to re-defined standard colors for logging levels. Besides that, it's possible to re-define numeric values of standard colors, for example:

log4j.appender.CONSOLE.layout.Levels=INFO:2;10,WARN:2;32
log4j.appender.CONSOLE.layout.Colors=white:10

Or:

    <param name="Levels" value="INFO:2;10" />
    <param name="Colors" value="white:10" />

Read JavaDoc of MulticolorLayout.

The only dependency you need is (you can also download jcabi-log-0.24.3.jar and add it to the classpath):

<dependency>
  <groupId>com.jcabi</groupId>
  <artifactId>jcabi-log</artifactId>
  <version>0.24.3</version>
</dependency>