In case you are in 6.20: Don't use it, as it won't be compatible in following versions (if there was one available at all)
For 6.30 and up: Please use this link to got to the general API overview in SDN:
https://www.sdn.sap.com/sdn/developerareas/ep.sdn?page=javadoc.htm
And this one to directly access Logging API:
http://media.sdn.sap.com/html/submitted_docs/60_sp2_javadocs/log/index.html
Regards,
Benny
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