Access DB Connection from standalone application

 public static Connection getDatabaseConn() throws NamingException{  
      Context ctx=null;  
      Connection conn = null;       
      Properties env = new Properties();   
      env.put(Context.INITIAL_CONTEXT_FACTORY,"weblogic.jndi.WLInitialContextFactory");   
      env.put(Context.PROVIDER_URL,"t3://127.0.0.1:7001");   
      ctx = new InitialContext(env);   
      try {  
           dataSource = (DataSource) ctx.lookup("ExtDevDB");     //jndi datasource name  
      } catch (NamingException e) {  
           e.printStackTrace();  
      }  
      try{  
      conn = dataSource.getConnection();  
      }catch(Exception e){  
           e.printStackTrace();  
      }finally{  
      }  
      return conn;       
 }  

Use t3 protocol to connect Weblogic server.