Question

I am using Java in order to send HTTP Requests to webservices. I manage to send one, but I cannot send two. This is a part of my code (some parts removed for readability :

try {
String data =  "<soap:Envelope xmlns:soap= ... datas xml ... </soap:Envelope>";
URL url = new URL(".......url........");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.addRequestProperty("Content-Type", "text/xml");
conn.addRequestProperty("SOAPAction", .......action.......");
conn.setDoOutput(true);
OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream()); // fail here for the second request

//write parameters
writer.write(data);
writer.flush();

// Get the response
StringBuffer answer = new StringBuffer();
BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line;
while ((line = reader.readLine()) != null) {answer.append(line);
}
    writer.close();
reader.close();

//Output the response
String str=answer.toString();
// conn.disconnect(); // Should I put it ?
label.setText(str);
} 

catch (Exception ex) {label.setText(ex.getMessage());}

This request works fine. If I put the same after and do some tests, I find that it does not work (I change the names of variables, in case..). I have found that it fails at the line with the OuputStreamWriter. I get this error with getMessage in the exception :

access denied (java.net.SocketPermission ….url….. connect,resolve)

How could I fix it ? I figure out it is possible to send several requests…
Is the method disconnect() useful here ?

I tried to send the request via an other class (in fact, I have a webpage and javascript call the requests one by one), and it does not work too..

Thank you very much for any advice or help !

===================== EDIT =======================

Here is a whole applet :

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JLabel;
import netscape.javascript.JSException;
import netscape.javascript.JSObject;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class Test extends JApplet {
private JSObject jso;
private JLabel label = new JLabel();

public void init(){
    this.setSize(300, 80);

    label.setHorizontalAlignment(JLabel.CENTER);
    label.setForeground(Color.blue);
    label.setText("hello world");

    this.getContentPane().add(label, BorderLayout.NORTH);
}

public void doJavascript(){
    label.setText("hellooooooooo");
}


public void closeConnect(String SECTK, String SESSID){
    jso = JSObject.getWindow(this);
    label.setHorizontalAlignment(JLabel.CENTER);
    label.setForeground(Color.blue);
    try{
     String data ="dataaaaa";
     label.setText("yes2");
 URL url = new URL(".........url.............");
 HttpURLConnection conn = (HttpURLConnection) url.openConnection();
 conn.addRequestProperty("Content-Type", "text/xml");
 conn.addRequestProperty("SOAPAction", ".....url........");
 conn.setDoOutput(true);
 label.setText("yes25");
 OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream());
 label.setText("yes3");
 writer.write(data);
 writer.flush();

 StringBuffer answer = new StringBuffer();
 BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
 String line;
 while ((line = reader.readLine()) != null) {
     answer.append(line);
 }
 writer.close();
 reader.close();
 //Output the response*/
    String str=answer.toString();
    conn.disconnect();
    label.setText(str);
 } 
 catch (Exception ex) {
// label.setText("nooo");
 label.setText(ex.getMessage());
}
this.getContentPane().add(label, BorderLayout.NORTH);
}
}

If I call doJavascript from a javascript file, it works. If I call closeConnect from the same javascript file, it does not work, and I retrieve in my label “yes25”, which is just before the “OuputStreamWriter”…

I hope it is clear.

Thanks for any help or advice

Answer 1

I have fixed it : there is a security problem for calls from javascript to java for some kinds of methods – for example http requests : http://jdk6.java.net/plugin2/liveconnect/#SECURITY_MODEL

So the code must bu changed like this :

final HttpURLConnection conn = (HttpURLConnection) url.openConnection();

and

OutputStreamWriter writer;
                // This is needed as code called from Javascript does not have the rights to do this
                try
                {
                    writer = 
                        AccessController.doPrivileged(
                            new PrivilegedExceptionAction<OutputStreamWriter>() {
                                public OutputStreamWriter run() throws IOException {
                                    return new OutputStreamWriter(conn.getOutputStream());
                                }
                            }
                        );
                }
                catch (PrivilegedActionException e) {
                    // e.getException() should be an instance of IOException,
                    // as only "checked" exceptions will be "wrapped" in a
                    // PrivilegedActionException.
                    throw (IOException) e.getException();
                }

and

StringBuffer answer = new StringBuffer();
                BufferedReader reader;
                // This is needed as code called from Javascript does not have the rights to do this
                try
                {
                     reader = new BufferedReader(
                        AccessController.doPrivileged(
                            new PrivilegedExceptionAction<InputStreamReader>() {
                                public InputStreamReader run() throws IOException {
                                    return new InputStreamReader(conn.getInputStream());
                                }
                            }
                        )
                    );
                }
                catch (PrivilegedActionException e) {
                    // e.getException() should be an instance of IOException,
                    // as only "checked" exceptions will be "wrapped" in a
                    // PrivilegedActionException.
                    throw (IOException) e.getException();
                }