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AndyC1000

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Log4j.properties, set location of rolling File according to program arguments

Hello,

I've created a log4j.properties file with the below code.  How do I change the location of the file according to program arguments?  

log4j.appender.rollingFile = org.apache.log4j.RollingFileAppender
log4j.appender.rollingFile.File = D:/mylog.log
log4j.appender.rollingFile.MaxFileSize = 2MB
log4j.appender.rollingFile.MaxBackupIndex = 2
log4j.appender.rollingFile.layout = org.apache.log4j.PatternLayout
log4j.appender.rollingFile.layout.ConversionPattern = %d{yyyy-MM-dd HH:mm:ss} %c{1} [%p] %m%n

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Thanks
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for_yan
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Avatar of Sathish David  Kumar N
Use like this  log4j.appender.ROLLING.File=${user.home}/mylog.log .it will take user(login) home .

Or you can use java.util.property to change the  property file deatils

>>Use like this  log4j.appender.ROLLING.File=${user.home}/mylog.log .it will take user(login) home .

That's correct, and can be extended to use a custom jvm arg too, which you can pass at startup
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AndyC1000

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Thanks I'll look into your responses.

I'm not creating a web app.

I'd like to use java.util.property to change the property file details, based on the directory specified in the batch file by the user.
Possibly easier to just specify the name on the command line in your batch file as for_yan suggested in first comment.
Thanks, I've looked at the link provided by for_yan

Tried adding the following line in the log4j.properties file,
log4j.appender.rollingFile = ${logFile_var}/mylog.log

and the following line to the run configuration VM args
-DlogFile_var = "C:/temp"

I'm getting an error, wondering if the syntax is incorrect?

java.lang.NoClassDefFoundError: =
Caused by: java.lang.ClassNotFoundException: =
      at java.net.URLClassLoader$1.run(Unknown Source)
      at java.security.AccessController.doPrivileged(Native Method)
      at java.net.URLClassLoader.findClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
Exception in thread "main"

Thanks
you need to add -DlogFile_var  before the class - this is how you were doing it?

and in the log4j,properties, I believe, it looks something like that:

log4j.appender.R = org.apache.log4j.DailyRollingFileAppender
log4j.appender.R.File = logs/bensApps.log
log4j.appender.R.Append = true
log4j.appender.R.DatePattern = '.'yyy-MM-dd
log4j.appender.R.layout = org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern = %d{yyyy-MM-dd HH:mm:ss} %c{1} [%p] %m%n

http://www.benmccann.com/dev-blog/sample-log4j-properties-file/


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I decided to get it running in Eclipse.

Added to Run Configurations -  VM arguments
-DlogFile_var = C:/temp

The error has now changed to:

og4j:ERROR Could not instantiate class [C:/temp/mylog.log].
java.lang.ClassNotFoundException: C:/temp/mylog.log
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Unknown Source)
	at org.apache.log4j.helpers.Loader.loadClass(Loader.java:178)
	at org.apache.log4j.helpers.OptionConverter.instantiateByClassName(OptionConverter.java:319)
	at org.apache.log4j.helpers.OptionConverter.instantiateByKey(OptionConverter.java:120)
	at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:629)
	at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:612)
	at org.apache.log4j.PropertyConfigurator.configureRootCategory(PropertyConfigurator.java:509)
	at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:415)
	at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:441)
	at org.apache.log4j.helpers.OptionConverter.selectAndConfigure(OptionConverter.java:470)
	at org.apache.log4j.LogManager.<clinit>(LogManager.java:122)
	at org.apache.log4j.Logger.getLogger(Logger.java:117)
	at project.Adaptor.<clinit>(project.Adaptor:21)
log4j:ERROR Could not instantiate appender named "rollingFile".
log4j:WARN No appenders could be found for logger (project.Adaptor).
log4j:WARN Please initialize the log4j system properly.

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The error is caused by:

private static final Logger log = Logger.getLogger(Adaptor.class);
see my last comment
Thanks objects removed the spaces and found the error changed to the above.
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You probably still have spaces between equal signs
or maybe

log4j.appender.rolling.File = ${logFile_var}/mylog.log

or
log4j.appender.R.File =...
as they show in the sampel above