Log4j v. Java 1.4?

[Siegfried Heintze]

What is the difference between log4j, jakarta logging and the logging feature implemented as part of Java 1.4?

Thanks,
Siegfried

[Ulf Dittmer]

log4j and the java.util.logging package are actual implementations of logging, while Commons Logging merely puts a common API on top of actual logging implementations. If you code against Commons Logging, you can swap out, e.g., the Java logging package for log4j later w/o having to adapt your code. There may be other logging libraries it supports.

[Stuart Ash]

Commons Logging is like JDBC, it's a set of interfaces.

Log4J and JDK1.4 Logging are essentially implementations which can then be wrapped by Commons Logging.