Best practices for Java logging from multiple threads?

Question

I want to have a diagnostic log that is produced by several tasks managing data. These tasks may be in multiple threads. Each task needs to write an element (possibly with s

Answer 1

I tend to use SLF4J on top of Log4J. The parameterized logging functionality is especially attractive if you are going to have a lot of logging statements that may well get switched off in a production environment.

It can also run over the top of java.util.logging or use it's own simple output.