jndi example

simple.java

    public SomeConstructor(){
        this.dataSource = initDatasource("jdbc/mysqldb01");
    }

    private static DataSource initDatasource(String jndi){
        try {
            javax.naming.Context ctx = new InitialContext();
            // relative to standard JNDI root for J2EE app
            javax.naming.Context envCtx = (javax.naming.Context) ctx.lookup( "java:comp/env" );
            return (DataSource) envCtx.lookup( jndi );
        } catch(NamingException ex) {
            throw new IllegalStateException(ex);
        }
    }


   public doRequest(...){
       try(Connection conn = this.dataSource.getConnection()){
           doSomething(conn, param1, param2...);
       }
   }