I have downloaded the CQL driver provided by Datastax using 

Then tried a sample program to connect to the cluster
Cluster cluster = Cluster.builder()

But sadly its returning com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed   

I am using cassandra 1.2.2

Can any one suggest me whats wrong with that. 

And i am really sorry for posting  datastax java driver related question in this forum, can't find a better place for the instant reaction