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Log4j problem. not able to create backup for multiple jvm

Posted on 2004-04-25
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Last Modified: 2007-12-19
Not sure this is the right folder, but please help me.

This is my log4j configuration file.

log4j.logger.test=debug, app1

log4j.appender.consolestdout=org.apache.log4j.ConsoleAppender
log4j.appender.consolestdout.layout=org.apache.log4j.PatternLayout

# Pattern to output the caller's file name and line number.
log4j.appender.consolestdout.layout.ConversionPattern=%d{dd/MM/yy,HH:mm:ss} %5p [%t] - %m%n

# Configure the file appender :  app1
log4j.appender.app1=org.apache.log4j.RollingFileAppender
log4j.appender.app1.File=d:/test/logs/test.log
log4j.appender.app1.MaxFileSize=1MB
# Keep 4 backup file
log4j.appender.app1.MaxBackupIndex=4
log4j.appender.app1.layout=org.apache.log4j.PatternLayout
log4j.appender.app1.layout.ConversionPattern=%d{dd/MM/yy,HH:mm:ss} %5p [%t] - %m%n

The observation is :
If I only run one Java application that creates this log file, then everything is fine. It is able to create backup file like test.log1 and test.log2 after it reaches file size 1MB.

The problem is :
If I have multiple Java applications (multiple JVM) that use this log file (this file appender) then I found it is not able to create backup file. It always stays at test.log after it reaches 1MB file size. The previous content will be just cleared and then create a new same file.

It might make sense but is there a way to over come this? This is to say I want to make it no difference from 1 JVM or multiple JVM for the log file behavior.

Thank you very much.
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Question by:i_am_diablo2000
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KartikShah earned 50 total points
ID: 10918704
I do not know much. But one thing that I know about Log4J is that it takesa exclusive lock on the log file to which it appends, i.e. it does not allow any other program to delete the file, even empty the contents.

This might be the source of your problem, if this is te culprit, in that case it will be difficult that we can do an thing much about it. :(
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