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How do we know which is the right Appender to use between RollingFileAppender and FileAppender?
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Log4j2 RollingFileAppender is an OutputStreamAppender that writes log messages to files, following a configured triggering policy about when a rollover (backup) should occur. It also has a configured rollover strategy about how to rollover the file.
On DailyRollingFileAppender the file is rolled over at a user chosen frequency, but on RollingFileAppender the file is rolled when the file reaches certain size.
The MaxBackupIndex option determines how many backup files are kept before the oldest is erased. This option takes a positive integer value. If set to zero, then there will be no backup files and the log file will be truncated when it reaches MaxFileSize .
Let's look at the configuration for a rolling file appender in Log4j that rolls based on file size: Here, we configured Log4j to roll the log file when its size reaches 5KB, using the MaxFileSize parameter. We also instructed Log4j to keep a maximum of two rolled log files using the MaxBackupIndex parameter.
Log4j2 RollingFileAppender is an OutputStreamAppender that writes log messages to files, following a configured triggering policy about when a rollover (backup) should occur. It also has a configured rollover strategy about how to rollover the file. Generally backup of log files are created based on file size, current date or both. 1.
In this article, we will explore how to configure rolling file appenders in some of the most widely used logging libraries — Log4j, Log4j2, and Slf4j. We'll show how to roll log files based on size, date/time, and a combination of size and date/time.
FileAppender: Appends log events to a file. It supports two more appender classes: RollingFileAppender, DailyRollingFileAppender: Both are the most widely used appenders that provide support to write logs to file. JDBCAppender: The JDBCAppender is used for sending log events to a database.
You may want to read the Apache Log4j 1.2.17 API:
org.apache.log4j.FileAppenderFileAppender appends log events to a file.
org.apache.log4j.RollingFileAppenderRollingFileAppender extends FileAppender to backup the log files when they reach a certain size.
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