How can I create specialized log files with log4j to tailor logging to specific needs?

Specialized Logging with log4j: Tailoring Log Files to Specific Needs

Log4j's versatile configuration capabilities allow you to create multiple log files with varying levels of logging. Here's how you can achieve your goal:

Creating a Master Log

Configure a root logger that captures all INFO and higher messages for all classes. In development mode, adjust the threshold to DEBUG and TRACE for specific classes.

log4j.rootLogger=QuietAppender, LoudAppender, TRACE

Configuring a Specialized Log for Subset of Classes

Create an appender that logs only DEBUG messages, specifically from the desired subset of classes. Ignore messages from other classes.

# setup A2
log4j.appender.LoudAppender=org.apache.log4j.RollingFileAppender
log4j.appender.LoudAppender.Threshold=DEBUG
log4j.appender.LoudAppender.File=loud.log

Specific Class Configuration

Associate the specialized log with the appropriate classes. In this example, the class com.yourpackage.yourclazz will log TRACE messages to the specialized log.

log4j.logger.com.yourpackage.yourclazz=TRACE

With this configuration, you'll have two log files: quiet.log containing INFO and higher messages for all classes, and loud.log containing DEBUG messages only for the specified subset of classes.

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