Question: Im working on a project in which i got to use hbase.The project is in java based. I need to know what is the best hbase client api for java.

Answer: 
HBase has its own java client in core library. It covers pretty much everything. (Got connection as well). If you need a asynchronous client You can check [asyncbase](https://github.com/stumbleupon/asynchbase) from stumbleupon, which is a solid client. But it's filter support is limited.(it has basic filters though, and they work like charm). If you are using java I wouldn't recommend using via rest.
Kundera is a recommend client for use.
the author is work hard for it.