CODEWITHSUNDEEP
java
blue-sky
blue-sky

Reputation: 53786

java tutorial - unknown host exception

I'm trying to read a URL using the tutorial : http://docs.oracle.com/javase/tutorial/networking/urls/readingURL.html

import java.net.*;
import java.io.*;

public class URLReader {
    public static void main(String[] args) throws Exception {

        URL oracle = new URL("http://www.google.com/");
        BufferedReader in = new BufferedReader(new InputStreamReader(oracle.openStream()));
        String inputLine;

        while ((inputLine = in.readLine()) != null)
            System.out.println(inputLine);

        in.close();
    }

}

But I'm getting below exception. www.google.com is a known host ?

Exception in thread "main" java.net.UnknownHostException: www.google.com
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:195)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
    at java.net.Socket.connect(Socket.java:529)
    at java.net.Socket.connect(Socket.java:478)
    at sun.net.NetworkClient.doConnect(NetworkClient.java:163)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:395)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:530)
    at sun.net.www.http.HttpClient.<init>(HttpClient.java:234)
    at sun.net.www.http.HttpClient.New(HttpClient.java:307)
    at sun.net.www.http.HttpClient.New(HttpClient.java:324)
    at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:970)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:911)
    at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:836)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1172)
    at java.net.URL.openStream(URL.java:1010)
    at URLReader.main(URLReader.java:8)

Upvotes: 3

Views: 8036

Answers (3)

Olivier.Roger
Olivier.Roger

Reputation: 4249

Are you running behind a proxy ? The article seems to suggest there is a configuration needed in that case.

Alternatively, the program might hang or you might see an exception stack trace. If either of the latter two events occurs, you may have to set the proxy host so that the program can find the Oracle server.

Upvotes: 3

glarkou
glarkou

Reputation: 7101

Are you behind a proxy? Try to set the proxy in eclipse or try 

 java -DproxySet=true -DproxyHost=10.0.0.14 -DproxyPort=6588 JavApp

Upvotes: 3

Samir Mangroliya
Samir Mangroliya

Reputation: 40406

I think its network error check your internet Connection....

Upvotes: 2

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