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Basics of DataSource : Datasource is a name given to the connection set up to a database from a server . DataSource is an alternative to DriverManager for getting the connection .  We should prefer database connections getting from  a DataSource instead of a DriverManager. Using a Datasource you need to know only the JNDI name. The JNDI style is typical when using an application server or a web container Java Example for configuring and accessing a DataSource : -------------------------------------------------------- 1)  Configure the JNDI DataSource in Tomcat by adding a declaration for your resource to your Context in server.xml   <Resource name="jdbc/myoracle" auth="Container"               type="javax.sql.DataSource" driverClassName="oracle.jdbc.OracleDriver"               url="jdbc:oracle:thin:@127.0.0.1:1521:mysid"             ...