you should add the parameters to log4j which you are interested in
then set log4j to different level
during coding,set the level "debug"
when running ,set the level "warn"

Try SuperLogging from
http://www.acelet.com/super/SuperLogging/index.html.
It logs whereas information as well. You can dynamically reconfigre
everything.
It is free.

I can't be done without considerable complexity -- the Java runtime doesn't
give you reflective access to the parameter values as it does to the method
names.

You /could/ do it by pre-processing your Java source files to include full
logging information automatically, or you could indulge in some bytecode
rewriting to include the equivalent at runtime.  Its hard to see either course
being worth the effort, though, unless you can find a pre-packaged
implementation.  I don't know of one myself, and -- even if I did -- I wouldn't
trust it in a production environment.

   -- chris

You could try to use Aspects (Aspect Oriented Programming - AOP) to
achieve this.

Have a look at the AspectJ manual, I think something like that is
actually described there.

http://www.eclipse.org/aspectj

Note, that although the URL points to eclipse it is not an Eclipse
exclusive technology. It can be used very well without Eclipse (it
offers a command line compiler and Ant tasks to integrate into your
build environment)

Regards
Thomas

You need to clear up one thing, aer you talking about automagically
printing all the information about a call, from say log4j. Or are just
talking about printing a log statement with a set of data arguments?

The last one is easy to perform, but it requires that you add a log
statement at the beginning, and possibly end, of each api method.

/tom