cobarclient
mvn install will package everything for you, including the documentations, the libraries, etc.
A quick-start can be found at http://code.alibabatech.com/wiki/display/CobarClient/Home(Since the domain "alibabatech" is discarded by alibaba internally, I have moved a copy of 中文版参考文档 and Reference Guide to my personal blog.)
you can start with cobar-client by reading the documentation bundled with the distribution, the documentation is very elaborate.
GL & HF with cobar-client!
Lisence
Apache License Version 2.0, January 2004 http://www.apache.org/licenses/