How to Configure Log4j to Output Different Logging Levels to Separate Appenders?

Creating Multiple Log Files of Varying Content with Log4j

Question: It is possible to configure log4j to output different logging levels to separate appenders?

The goal is to establish multiple log files where a primary log captures INFO-level messages and higher from all classes, while a secondary log exclusively captures DEBUG-level messages from a specific group of classes.

Answer:

Log4j can be configured to accomplish the desired logging behavior:

<code class="xml"># Define the root logger
log4j.rootLogger=QuietAppender, LoudAppender, TRACE

# Configure Appender A (QuietAppender) for INFO and higher messages
log4j.appender.QuietAppender=org.apache.log4j.RollingFileAppender
log4j.appender.QuietAppender.Threshold=INFO
log4j.appender.QuietAppender.File=quiet.log

# Configure Appender B (LoudAppender) for DEBUG and higher messages
log4j.appender.LoudAppender=org.apache.log4j.RollingFileAppender
log4j.appender.LoudAppender.Threshold=DEBUG
log4j.appender.LoudAppender.File=loud.log

# Set the logging level to TRACE for a specific class or package
log4j.logger.com.yourpackage.yourclazz=TRACE</code>

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