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Specify log location using Log4j

Posted on 2013-05-10
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Last Modified: 2014-04-22
I have a war file which uses log4j for logging.
Log4j.properties has the following for log file creation -

log4j.appender.fileAppender.File=C:/temp/MyApplication.log

The problem is that this war file is going to be deployed in Windows and Linux, so I don't want to hard code it to c:/temp.

Is there a way to provide this path in a generic way, say using some environment variables, java home, user directory etc.
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Question by:ank5
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Expert Comment

by:CEHJ
ID: 39155012
Try

log4j.appender.fileAppender.File=${user.home}/MyApplication.log

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Expert Comment

by:Sharon Seth
ID: 39155039
Such config details should not be part of war file . Instead it should be in an external properties file , which would be read by one of your classes packaged into the war
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Assisted Solution

by:Valeri
Valeri earned 100 total points
ID: 39155142
just use this in your Log4j.properties file:

it should be something like that in your properties file

# Define the root logger with appender file
log = /usr/home/log4j

# Define the file appender
log4j.appender.fileAppender.File=${log}/yourLogFile.out
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Author Comment

by:ank5
ID: 39156197
>>on which server you are running this appl?

It's tcserver
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Expert Comment

by:CEHJ
ID: 39156438
How is that relevant btw?
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Author Comment

by:ank5
ID: 39160355
log4j.appender.fileAppender.File=${user.home}/MyApplication.log

I tried this but it does not seem to work. Attached is how the log file looks like, is there something wrong in it?


Thanks
log4j.txt
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Author Comment

by:ank5
ID: 39160357
>>Such config details should not be part of war file . Instead it should be in an external properties file , which would be read by one of your classes packaged into the war

This isn't really an option for me. This log4j.properties is provided as a part of the product (Documentum xCP in this case), I can only modify it add logging for my custom classes.
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Expert Comment

by:Valeri
ID: 39160670
if you want a different path for windows and linux then you have to have something like configuration file that is different for windows and linux.
after reading this file at the beginning /before to initialize Log4J/ you can set the path properly in this way:

System.setProperty("logPath", "the path specified in the config file");

then in your Log4J.properties file you have to have this:
log4j.appender.fileAppender.File=${logPath}/yourLogFile.out
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Accepted Solution

by:
CEHJ earned 400 total points
ID: 39160678
I tried this but it does not seem to work.
Works fine for me:
package com.m1.m2;

import org.apache.log4j.Logger;

public class LoggerTest {
    public static void main(String[] args) {
	Logger  logger = Logger.getLogger(LoggerTest.class);
	logger.debug("debugging...");
    }
}

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goose@vaio:/tmp$ java com.m1.m2.LoggerTest
2013-05-13T09:38:44.421+0100 DEBUG [Tmain] [] [com.m1.m2.LoggerTest:11] debugging...
goose@vaio:/tmp$ cat ~/MyApplication.log
2013-05-13T09:38:44.421+0100 DEBUG [Tmain] [] [com.m1.m2.LoggerTest:11] debugging...

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Author Comment

by:ank5
ID: 39161530
Hi CEHJ

Can you please try it with the log file that I had posted. I think that my log file may be incorrect.

Thank you
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Expert Comment

by:CEHJ
ID: 39161562
That's what i did try it with (hence the same package name as yours) ;)
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Author Comment

by:ank5
ID: 39198504
There was a problem with the product, it was loading the wrong log4j.properties file, hence closing the question.

Thanks for your inputs.
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Author Comment

by:ank5
ID: 39198505
The new package name structure is

com.lowagie.text.pdf.PdfWriter;

It seems that they have completely refactored their API.
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Author Comment

by:ank5
ID: 39198507
-
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Author Comment

by:ank5
ID: 39198511
Please ignore the last two comments, they were posted in this question by mistake. I can't find an option to delete these comments.
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Expert Comment

by:CEHJ
ID: 39199029
Never mind :)
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