Comments on: Log4j tutorial

By: Jan Pride

Jan Pride — Wed, 29 Dec 2010 15:44:14 +0000

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By: apiero

apiero — Tue, 12 Oct 2010 14:43:17 +0000

Hi,

can you paste your log4j conf file?

By: Ankit jain

Ankit jain — Tue, 12 Oct 2010 09:27:43 +0000

I am using log4j api for a clustered environment.

But facing following issue:

log4j:ERROR Could not instantiate appender named “stdout”.
[10/12/10 12:47:20:075 IST] 00000036 SystemErr R log4j:WARN No appenders could be found for logger (fscServices).
[10/12/10 12:47:20:075 IST] 00000036 SystemErr R log4j:WARN Please initialize the log4j system properly.

Please help, what may be the reason?

Ankit

By: Memory card

Memory card — Wed, 26 May 2010 16:01:34 +0000

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By: apiero

apiero — Thu, 11 Feb 2010 14:19:00 +0000

Hi,

can you post your log4j configuration?

Bye
Apiero

By: vidya

vidya — Thu, 11 Feb 2010 10:19:06 +0000

log4j:ERROR Could not instantiate class [D:/NetBeansProjects/Test/Resources/care.log].
java.lang.ClassNotFoundException: D:/NetBeansProjects/Test/Resources/care.log
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at org.apache.log4j.helpers.Loader.loadClass(Loader.java:179)
at org.apache.log4j.helpers.OptionConverter.instantiateByClassName(OptionConverter.java:320)
at org.apache.log4j.helpers.OptionConverter.instantiateByKey(OptionConverter.java:121)
at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:664)
at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:647)
at org.apache.log4j.PropertyConfigurator.configureRootCategory(PropertyConfigurator.java:544)
at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:440)
at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:334)
at org.apache.log4j.PropertyConfigurator.configure(PropertyConfigurator.java:342)
at MainFrame.main(MainFrame.java:101)
log4j:ERROR Could not instantiate appender named “R”.
log4j:WARN No appenders could be found for logger (MainFrame).
log4j:WARN Please initialize the log4j system properly.

how i can solve this problem.

By: tanzeem akhtar

tanzeem akhtar — Wed, 04 Feb 2009 07:44:53 +0000

Hi apiero,
Thanks foryour reply.
Yes you understand my problem.
But for solution i must have a separate file that has only info level messages. I did the same as you are saying, but my focus is on getting only info level messages. Can you help me now?

By: apiero

apiero — Tue, 03 Feb 2009 12:54:01 +0000

Hi,

you cannot have ONLY info messages but you can get messages higher of a certain level: if you set the threshold to INFO you will get also WARN, ERROR and FATAL messages.
Did I understand you question correctly?

Bye
apiero

By: tanzeem akhtar

tanzeem akhtar — Tue, 03 Feb 2009 11:51:07 +0000

How to make a separate file for log that is having only info messages?
Please help me out.

By: apiero

apiero — Fri, 24 Oct 2008 12:07:34 +0000

Hi Rocky,

if you need the logger to log in 2 different places you need to attach 2 different appenders to it. Please read the configuration I reported above that looks like:

#Here we attach 2 appenders to rootLogger
log4j.rootLogger=DEBUG, console, file
# The appender called ‘console’ is of type ConsoleAppender
# This appender shows you all info for better debugging
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.Threshold=DEBUG
# The appender called ‘file’ is of type FileAppender
# This appender shows you only messages ABOVE the INFO level
# It writes in file ‘test.log’
log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.Threshold=INFO
log4j.appender.file.File=test.log

Is it any clearer?
Hope it helps you out.

Bye
apiero