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From Currimbhoy Shahyan <Shahyan.Currimb...@siemens.com>
Subject Unable to populate 'Class', 'Method', 'Line' and 'File' fields wi thin Chainsaw
Date Thu, 02 Dec 2004 14:55:15 GMT

I am using Chainsaw to view logs generated via Log4j however I can't seem to
get anything inside the 'Class', 'Method', 'Line' and 'File' fields within
Chainsaw. I seem to get '?' inside all those fields.
I am trying to set the layout using Conversion Pattern however it doesn't
seem to recognize it. No matter what I put in the conversion pattern, it
only populates the standard fields (level, logger, time, thread, message).
When I tried setting the Conversion pattern for the Console Appender, I can
view the correct values in the Class, Method, Line and File fields.
Is there something additional I need to do in order to view these fields
inside Chainsaw. I am using a normal SocketAppender with the following
snipet from Log4j.xml:

<!-- Chainsaw Client -->
	<appender name= "CHAINSAW_CLIENT" class=
"org.apache.log4j.net.SocketAppender" >
    	<param name= "RemoteHost" value= "165.226.223.135"/>
    	<param name= "Port" value= "4445" />
    	<layout class="org.apache.log4j.PatternLayout">
		<!-- NO MATTER WHAT I PUT IN THE CONVERSION PATTERN, IT HAS
NO EFFECT ON THE LOGS WITHIN CHAINSAW-->
			<param name="ConversionPattern" value="%c{2} %L %F
%C %M %p %m %n" />
		</layout>
    </appender >



-----Original Message-----
From: Adriano Labate [mailto:adriano.labate@sportaccess.com]
Sent: Thursday, December 02, 2004 6:44 AM
To: Log4J Users List
Subject: RE: Multiple DailyRollingFileAppender on the same file :
renaming fails


Hi,

I tested a log4j configuration where I have 2 DailyRollingFileAppender
pointing to the same physical file and having a different PatternLayout. The
first one is used by the root logger and the second one by an explicit
logger.

In my previous post, I used this configuration on a Oracle JVM, now on a
standard Sun JVM.

In both cases, when it's time to rollover the file, the renaming fails.

The reason is that each appender maintains a handle on the file resulting in
two handles, that creates a lock and the renaming always fails and the
previous log content is lost.

-----------------------------------------------------
Handle v2.2
Copyright (C) 1997-2004 Mark Russinovich
Sysinternals - www.sysinternals.com

java.exe           pid: 1876   C:\transferService.log
java.exe           pid: 1876   C:\transferService.log
-----------------------------------------------------

I wonder whether it is the correct behavior ? It seems to me that log4j has
a full control on its configuration and could handle this situation. Maybe
this could be fixed in version 1.3 ?

Adriano Labate


-----Message d'origine-----
De : Adriano Labate [mailto:adriano.labate@sportaccess.com]
Envoyé : mercredi, 1 décembre 2004 17:06
À : log4j-user@logging.apache.org
Objet : Multiple DailyRollingFileAppender on the same file : renaming fails

Hi,

I just resolved a problem with the DailyRollingFileAppender and I just want
to share my experience with others. If it can help someone...

When it was time to rollover the file, I got the error:

"log4j:ERROR Failed to rename [c:/temp/mspak/monitoring/transferService.log]
to [c:/temp/mspak/monitoring/transferService.log.2004-11-25.log]."

I search on Google for this error and found around 200 results and realized
that it was a problem for a lot of people.

As I use log4j with the Oracle JVM I supposed that it was an Oracle issue
with I/O or permissions. After a lot of discussions with the Oracle support,
it was definitely not the case.

I noted that a lot of discussions talked about the possibility that the file
has a handle on it that prevents log4j to rename the file.

To be sure I installed and run 2 tools from www.sysinternals.com : Handle
and Process Explorer.

Running Handle I got :

--------------
C:\>handle -u transferservice.log
Handle v2.2
Copyright (C) 1997-2004 Mark Russinovich
Sysinternals - www.sysinternals.com

oracle.exe         pid: 984    AUTORITE NT\SYSTEM
C:\TEMP\MSPAK\monitoring\transferService.log
oracle.exe         pid: 984    AUTORITE NT\SYSTEM
C:\TEMP\MSPAK\monitoring\transferService.log
--------------

There was indeed two handles on my log file. I double checked with Process
Explorer (a GUI app) and confirmed that Oracle maintained two handles on my
log file. Now I was sure that it was a file handle problem.

Then I got a flash and realized that in my log4j.xml configuration file I
have two daily rolling file appenders that pointed on the same physical
file.

I tried to keep only one of them. Retried and YES, there was now only one
handle on the file!
Tested the rollover and it finally worked!


My configuration file was :

--------------
    <!-- Daily Rolling File Appender -->
    <appender name="DRFA" class="org.apache.log4j.DailyRollingFileAppender">
        <param name="Threshold" value="DEBUG"/>
        <param name="File"
value="c:/temp/mspak/monitoring/transferService.log"/>
        <param name="DatePattern" value="'.'yyyy-MM-dd'.log'"/>
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%d{dd.MM HH:mm:ss:SSS}
%-5p [%c] %m%n"/>
        </layout>
    </appender>

    <!-- Daily Rolling File Appender   WARNING: disabled because file
renaming fails!!!
    <appender name="DRFA-blankpattern"
class="org.apache.log4j.DailyRollingFileAppender">
        <param name="File"
value="c:/temp/mspak/monitoring/transferService.log"/>
        <param name="DatePattern" value="'.'yyyy-MM-dd'.log'"/>
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%m%n"/>
        </layout>
    </appender>
    -->
--------------

I have now a question:

I didn't tried to use that configuration outside of Oracle, is it wrong to
use 2 appenders pointing on the same file (windows xp) ?
I searched on the Gülcü log4j manual but didn't found anything. Has anyone
tried to use this kind of configuration ?

I know that the Oracle JVM handles the threading differently than the Sun
JVM, so it can also explain the problem.

Adriano Labate




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