03-12-2008
Log4j overwriting logs! ..sometimes...
Hey,
hoping someone here can help me. I'm using log4j for logging in a Java server. Its using DailyRollingFileAppender and rolls every hour. The reason I'm posting here is that in windows it works fine, but in unix it doesnt. What happens is the logs are logged in a file, lets say 'requests'. Then every hour the requests are rolled. so after the first hour of the day we would have the file 'requests-08-03-12-01.log'. Then requests for the current hour will be logged in requests again. Problem is that if we stop the server then restart what happens is that the requests that were currently logged in 'request' get written to the previous log file, overwriting any existing info. This doesnt happen in windows. Also I read about changing directories and it seems to work if we log to a different directory, i.e. it doesnt overwrite anything on restart. So any ideas as to why when we use this directory we have this issue?
Thanks.
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LEARN ABOUT DEBIAN
log::log4perl::javamap
JavaMap(3pm) User Contributed Perl Documentation JavaMap(3pm)
NAME
Log::Log4perl::JavaMap - maps java log4j appenders to Log::Dispatch classes
SYNOPSIS
###############################
log4j.appender.FileAppndr1 = org.apache.log4j.FileAppender
log4j.appender.FileAppndr1.File = /var/log/onetime.log
log4j.appender.FileAppndr1.Append = false
log4j.appender.FileAppndr1.layout = org.apache.log4j.PatternLayout
log4j.appender.FileAppndr1.layout.ConversionPattern=%d %4r [%t] %-5p %c %x - %m%n
###############################
DESCRIPTION
If somebody wants to create an appender called "org.apache.log4j.ConsoleAppender", we want to translate it to Log::Dispatch::Screen, and
then translate the log4j options into Log::Dispatch parameters..
What's Implemented
(Note that you can always use the Log::Dispatch::* module. By 'implemented' I mean having a translation class that translates log4j
options into the Log::Dispatch options so you can use log4j rather than log4perl syntax in your config file.)
Here's the list of appenders I see on the current (6/2002) log4j site.
These are implemented
ConsoleAppender - Log::Dispatch::Screen
FileAppender - Log::Dispatch::File
RollingFileAppender - Log::Dispatch::FileRotate (by Mark Pfeiffer)
JDBCAppender - Log::Log4perl::Appender::DBI
SyslogAppender - Log::Dispatch::Syslog
NTEventLogAppender - Log::Dispatch::Win32EventLog
These should/will/might be implemented
DailyRollingFileAppender -
SMTPAppender - Log::Dispatch::Email::MailSender
These might be implemented but they don't have corresponding classes in Log::Dispatch (yet):
NullAppender
TelnetAppender
These might be simulated
LF5Appender - use Tk?
ExternallyRolledFileAppender - catch a HUP instead?
These will probably not be implemented
AsyncAppender
JMSAppender
SocketAppender - (ships a serialized LoggingEvent to the server side)
SocketHubAppender
ROLL YOUR OWN
Let's say you've in a mixed Java/Perl enviroment and you've come up with some custom Java appender with behavior you want to use in both
worlds, "myorg.customAppender". You write a Perl appender with the same behavior "Myorg::CustomAppender". You want to use one config file
accross both applications, so the config file will have to say 'myorg.customAppender'. But the mapping from "myorg.customAppender" to
"Myorg::CustomAppender" isn't in this JavaMap class, so what do you do?
In your Perl code, before you call Log::Log4perl::init(), do this:
$Log::Log4perl::JavaMap::user_defined{'myorg.customAppender'} =
'Myorg::CustomAppender';
and you can use 'myorg.customAppender' in your config file with impunity.
SEE ALSO
http://jakarta.apache.org/log4j/docs/
COPYRIGHT AND LICENSE
Copyright 2002-2009 by Mike Schilli <m@perlmeister.com> and Kevin Goess <cpan@goess.org>.
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
perl v5.10.1 2010-07-21 JavaMap(3pm)