Please recommend log utilities

Instead printing the debug message using System.out.println to the console, I want to put the debug, information, warning and error message into a log file.
Wonder is there any free and commonly used Java library providing this utilities?
Thanks

Although obviously 1.4 has some logging facilities built into it, I've been favorably impressed by Log4J, which seems like a very comprehensive, scalable, and free library.
Here:
http://jakarta.apache.org/log4j/docs/

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