Help me about rpc.blockchain.info Json-rpc blockchain API using Java

help me about rpc.blockchain.info rpc API using Java

hi want to connect rpc.blockchain.info by java
-> https://blockchain.info/api/json_rpc_api

for json-rpc using jsonrpc4j lib
-> https://github.com/briandilley/jsonrpc4j

my source result

Exception in thread "main" com.googlecode.jsonrpc4j.HttpException: {"error":{"message":"JSON-RPC method [getinfo] with 0 parameters not found.","code":-32601},"jsonrpc":"2.0"}
   at com.googlecode.jsonrpc4j.JsonRpcHttpClient.invoke(JsonRpcHttpClient.java:165)
   at com.googlecode.jsonrpc4j.JsonRpcHttpClient.invoke(JsonRpcHttpClient.java:105)
   at com.googlecode.jsonrpc4j.JsonRpcHttpClient.invoke(JsonRpcHttpClient.java:123)
   at com.option.bitcoin.AppTest2.main(AppTest2.java:55)
Caused by: java.io.IOException: Server returned HTTP response code: 401 for URL: http://rpc.blockchain.info:80
   at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
   at com.googlecode.jsonrpc4j.JsonRpcHttpClient.invoke(JsonRpcHttpClient.java:157)
   ... 3 more

i think not connectiong to rpc.blockchain.info

how i can do?

I'm sorry that I can not not speak English well
because i from south korea

help me plz~~ Cry

below my java source

Code:

import java.net.Authenticator;
import java.net.PasswordAuthentication;
import java.net.URL;
import com.googlecode.jsonrpc4j.JsonRpcHttpClient;
import org.json.simple.*;
/**
 * Unit test for simple App.
 */
public class AppTest2 
    
{

    public static void main(String args[]) throws Throwable
    {    	    

    	 final String rpcuser ="id";    	     	
    	 final String rpcpassword ="pwd";
    	 
 
    	  Authenticator.setDefault(new Authenticator() {
    	      protected PasswordAuthentication getPasswordAuthentication() {
    	          return new PasswordAuthentication (rpcuser, rpcpassword.toCharArray());
    	      }
    	  });
    	  
    	JsonRpcHttpClient client = null;
    	try {
    		
    		client = new JsonRpcHttpClient(new URL("http://rpc.blockchain.info:80"));    
    		
    		} catch (Exception e) {    		
    			e.printStackTrace();    		    		    	
    		} catch (Throwable t) {    		
    			t.printStackTrace();    		    		     	
    	}//end try/catch    	       	    	
    	String temp = client.invoke("getinfo",null,String.class);
    	System.out.println("temp=="+temp);
       
    }
}