Reference implementation
The reference implementation of the Log4j API is called Log4j Core. It is a versatile, reliable, feature-rich and production-ready implementation. The remaining chapters of the manual describe the ins and outs of this logging implementation:
- Do you want to learn about its architecture?
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Go to Architecture. 
- Do you want to install Log4j Core?
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Go to Installing Log4j Core. 
- Do you want to configure Log4j Core?
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Go to Configuration. 
- Do you want to write custom components for Log4j Core?
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Go to Extending. 
- Do you want to tune your installation for a better performance?
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Go to Performance.