i used my jar files using eclipse and was able to successfully connect to Cassandra DB .
One catch is i added all dependent libraries to build path to make it work .
Do you think i need to include all the dependencies when i call Cassandra JDBC jar via logstash ? Here is the error is got when using Cassandra JDBC jar
{:timestamp=>"2016-01-04T10:44:44.840000-0600", :message=>"Error: org.apache.cassandra.cql.jdbc.CassandraDriver not loaded. Are you sure you've included the correct jdbc driver in :jdbc_driver_library?"}
{:timestamp=>"2016-01-04T10:44:44.842000-0600", :message=>"You may be interested in the '--configtest' flag which you can\nuse to validate logstash's configuration before you choose\nto restart a running system."}
i made sure i included all the dependencies in to folder and added this folder to classpath and then executed it.