Logstash: Error: oracle.jdbc.driver.OracleDriver not loaded. Are you sure you've included the correct jdbc driver in :jdbc_driver_library?

Hi,

I am using Logstash-2.1.1. I want to fetch data from Oracle database and to put into ES.
I'm using following configuration. But it is saying that
"Error: oracle.jdbc.driver.OracleDriver not loaded. Are you sure you've included the correct jdbc driver in :jdbc_driver_library?"

Here is my logstash configuration,

input {  
      jdbc {
	jdbc_driver_library => "D:/ES/logstash/bin/ojdbc14.jar"
        jdbc_driver_class => "oracle.jdbc.driver.OracleDriver"
    	jdbc_connection_string => "jdbc:oracle:thin:@10.74.160.27:1521:xe"
    	jdbc_user => "kibana"
        jdbc_password => "kibana"
    	statement => "select name from k_session_lock_info_v"
    }
}
 
output {
    elasticsearch {
        hosts => "10.76.133.155:9200"
	action => "index"
        index => "smartsession"
    }
    stdout { codec => rubydebug }
}