Access a J2EE container-managed datasource

Conventional method using InitialContext & JNDI:

try{

Context context = new InitialContext();
DataSource ds = (DataSource) context.lookup("jdbc/demoDS");

}catch (NamingException e){

e.printStackTrace(); 

}

try{
Connection con = ds.getConnection();

}catch(SQLException e){

e.printStackTrace();

}

New using annotation and resource injection (J2EE 5):

@Resource(name = "demoDS")
 public void setDemoDataSource(DataSource ds) {
 this.demoDataSource = ds; 
}