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From Kevin Steppe <kste...@pacbell.net>
Subject Re: Basic question about log4j
Date Mon, 14 Jan 2002 22:32:48 GMT


Hu wrote:

> Hi, I am new to log4j. I have some basic questions
> about log4j.
> 1. In what kind of situation the constructor of
> appenders that takes parameter will be called? if I
> have my own appender that added more params, should I
> creat the corresponding constructor?
>

Since the configurator classes use the setXXX/getXXX methods, supply those and
don't worry about the extra constructors.

>
> 2. I use xml configuration file and use -D option to
> specify the file, should it auto reload when the
> confiration file changed? I can't get it work.
>

you need to use a 'configureAndWatch' method.  Look in the javadoc for the
config class.
Note that the configure and watch architecture is changing for log4j 1.2

>
> 3. The message in LoggingEvent is private access, for
> my situation, I need to put the timestamp in the
> message and in the appender I need to access the
> message to get the timestamp to create the file. And
> remove the timestamp when the actual logging happens.
> So is there any way to modify the message itself?
>

The LoggingEvents automaticly get a timestamp attached.  Use a pattern layout
object to pull that out, it's much less work than what you suggest.

Kevin



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