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Logging to one file from multiple java files

Timmy Ryan
Ranch Hand

Joined: Dec 09, 2007
Posts: 63

Hi Guys,

I want to set up a logger that writes to one file from many different java files.
I just want to user the Logger class for now as I think thats all I need for my program.



How would I change the above code so that I can use myLogger in a different java file but still in the same package?
Also I want to be able to log messages from within static and non-static methods which is where I�m having the trouble at the moment.
Hendy Setyo Mulyo
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Joined: Dec 01, 2004
Posts: 219

I believe your problem can be solved by using Singleton pattern. You have to wrap your myLogger object in a Singleton class. Hence, you will use your logger wrapper in any part of any class in your application, and will output the log message into one file.

For example:



You can use your wrapper in any part of any class in your application like this:


[ August 20, 2008: Message edited by: Hendy Setyo Mulyo ]

Hendy Setyo Mulyo
SCJP 1.4 (95%), SCWCD 1.4 (94%)
Tom Johnson
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Joined: May 11, 2005
Posts: 142
You should move the config of the destination log file, level, formatter etc out to log4j.properties for easier maintenance. You can specify where it is using JVM arg -Djava.util.logging.config.file=mylogging.properties.

You can create another instance of Logger in another class and just use that, you dont need to use the same instance. For example:


Then, depending on what level you have specifed out in the properties file (default is INFO unless changed), some, none or all of the above log messages will appear.

HTH


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