James is correct. For Log4j wrappers, all you need to do is pass the
FQCN of your class to the logger method that takes it. You absolutely
do not, and should not, modify Log4j to achieve this. For instance,
using a partial wrapper implementation with most details left out...
class LogWrapper {
/**
* Constant for name of class to use when recording caller
* of log method. Appending a dot at the end is recommended practice.
*/
private static final String FQCN = LogWrapper.class.getName() + ".";
public final void debug(final String message) {
logger.log(FQCN, Level.DEBUG, message, null );
}
}
Jake
James A. N. Stauffer wrote:
I don't think you need to change log4j code to achieve that.
On 10/25/07, orko <[EMAIL PROTECTED]> wrote:
Thanks for the feedback. I am still not sure exactly how it is working, but I
made it work. For future reference, I am explaining what I did.
In the category.java file there is a variable called FQCN. I changed its value
towards my logging.java class name, so that it gets caller's parent class. Thus
it can detect which class it was originally called from. Both file name and
line number is working correctly.
I had to run a build to get a working copy of jar.
Thanks again for your response.
-Orko
Matthew Kemp <[EMAIL PROTECTED]> wrote: I'm not a 100% for sure about how log4j
gets the class info, but I believe
it retrieves the previous value from the stack.
So if your class/method that was performing logging was Foo/foo, normally
the stack would look something like:
Logger.log(xx)
Foo.foo(xx)
...
However with your intermediary class your stack looks like:
Logger.log(xx)
logging.log(xx)
Foo.foo(xx)
...
So when log4j tries to get the previous class it comes up with logging for
every call.
On 10/25/07, orko wrote:
Hi every one,
I am trying to replace my current logging system into log4j. There is a
logging object (logging.java) which acts as a layer between logging system
and my application, so that other developers don't have to worry about this
change. So when a log method (debug, or trace) is called, it gets
initialized from this layer.
I have been trying to understand how the file name and line number (%f,
%l) works.
I can see the pattern in appender objects. But can't find how these
(filename and linenumber) are getting initialized. It always gives me
logging.java as file name instead of the file name where it was first
called. Does any one have any idea how it is really working?
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