Read data from URL - gives a weird error

[Rajkumar balakrishnan]

We have two web portals which has a centralized login. So decided to go with simple URL sending method like this one.

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;

public class CheckWebServices {

	public static void main(String args[]) {
        try{
            String data = URLEncoder.encode("username", "UTF-8") + "=" + URLEncoder.encode("admin", "UTF-8");
            data += "&" + URLEncoder.encode("password", "UTF-8") + "=" + URLEncoder.encode("admin", "UTF-8");

			URL url = new URL("http://xxx.xxx.x.xxx:8084/prjname/validation.do?username=admin&password=admin");//+data);
            URLConnection conn = url.openConnection();
            String line = "";
            conn.setDoInput(true);
            conn.setDoOutput(true);            
            BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            while ((line = rd.readLine()) != null) {
               System.out.println("The Response is :"+line);
            }
            rd.close();
        }catch(Exception e){
        	e.printStackTrace();
        }
	}
}

The error it gives is

java.io.FileNotFoundException: http://xxx.xxx.x.xxx:8084/prjname/validation.do?username=admin&password=admin
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1311)
	at com.drasis.utility.CheckWebServices.main(CheckWebServices.java:23)

Also when i type the URL in browser it's working fine, means code gets invoked and DB gets processed.

Although, the code is working fine as it's been called and database operations went successful but the only thing is it doesn't return the value(think so). So please let me know where i went wrong?

[R Srini]

Hi. Were you able to find a solution? This type of error can occur when our code is not properly accounting for http protocol details, and some other reasons. You could try these links:

- http://stackoverflow.com/questions/2794006/java-io-filenotfoundexception-for-valid-url
- http://www.codeguru.com/forum/archive/index.php/t-41552.html
- http://forums.sun.com/thread.jspa?threadID=337084

Please let us know if the above worked. In any case, as suggested in the stackoverflow post, I have always found it a good idea to use libraries like HttpClient instead of directly invoking URL.openConnection since HttpClient takes care of a lot of minor details, accounting for different http response codes, etc. Best of luck!

[Rajkumar balakrishnan]

R Srini wrote:Hi. Were you able to find a solution? This type of error can occur when our code is not properly accounting for http protocol details, and some other reasons. You could try these links:

- http://stackoverflow.com/questions/2794006/java-io-filenotfoundexception-for-valid-url
- http://www.codeguru.com/forum/archive/index.php/t-41552.html
- http://forums.sun.com/thread.jspa?threadID=337084

Please let us know if the above worked. In any case, as suggested in the stackoverflow post, I have always found it a good idea to use libraries like HttpClient instead of directly invoking URL.openConnection since HttpClient takes care of a lot of minor details, accounting for different http response codes, etc. Best of luck!

Still getting same error. I did tried all the solutions that were in the links but no use. Please let me know if there is any other workaround.

[R Srini]

I have tried your code with three different URLs and this works fine:

- http://search.yahoo.com/search?p=choochootrain
- http://www.bing.com/search?q=prahlad+jani
- https://coderanch.com/forums/jforum?module=search&action=search&forum=51&match_type=all&sort_by=time&search_keywords=world

And I do not have the time to setup two web portals with a centralized login (which is your environment). Also, I don't understand this statement:

Although, the code is working fine as it's been called and database operations went successful but the only thing is it doesn't return the value(think so).

I get your FileNotFoundException if I change "http://search.yahoo.com/search?p=choochootrain" to "http://search.yahoo.com/serch?p=choochootrain" - i.e. change "search" to "serch", or use an invalid hostname. Other than that, it always works for me.

So my best suggestion is that you come up with a short and sweet example that I can run and duplicate the problem, or provide a URL where this problem occurs, or maybe even a small, basic Eclipse project, and attach it to your reply post. Then I can try it out. Otherwise, I can keep on guessing and never be of any help.