How to Configure Log4j to Generate Multiple Log Files with Distinct Content?

Generating Multiple Log Files with Distinct Content Using Log4j

Problem Statement:

Develop a mechanism to configure log4j to distribute varying levels of logs to various appenders. The goal is to establish multiple log files, each capturing specific log levels and categories.

Solution:

To achieve the desired functionality, it is necessary to configure log4j accordingly. Below is an example configuration that demonstrates how to accomplish this:

<code class="xml">log4j.rootLogger=QuietAppender, LoudAppender, TRACE
# QuietAppender Configuration
log4j.appender.QuietAppender=org.apache.log4j.RollingFileAppender
log4j.appender.QuietAppender.Threshold=INFO
log4j.appender.QuietAppender.File=quiet.log
# LoudAppender Configuration
log4j.appender.LoudAppender=org.apache.log4j.RollingFileAppender
log4j.appender.LoudAppender.Threshold=DEBUG
log4j.appender.LoudAppender.File=loud.log
# Logger Category Configuration
log4j.logger.com.yourpackage.yourclazz=TRACE</code>

In this configuration:

• QuietAppender is configured to capture messages with a level of INFO or higher from all classes.
• LoudAppender is set to record messages with a level of DEBUG or higher from all classes.
• The logger category com.yourpackage.yourclazz is explicitly specified to capture TRACE-level messages.

As a result, the quiet.log file will contain INFO and higher level messages from all classes, while the loud.log file will capture DEBUG and higher level messages from all classes. Additionally, a separate log file can be created to capture specific messages from com.yourpackage.yourclazz by creating a corresponding logger category, as demonstrated in the given configuration.

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