Io error the network adapter could not establish the connection in logstash

unable to connect to database.tried 1times{:error_message =>"java::javasql::sqlrecoverableexception: io error the network adapter could not establish the connection in logstash"}

im connecting oracle to kibana while run the logstash confile above error will display in my logstash terminal

im beginner please help me ,
thanks in advance

Please show your Logsrtash pipeline configuration. Without anything more than that error message to go on it is hard to help.