Question

I hope someone can help me. I’m a bit of a noob to Java. But I have a question regarding calling a web service from Java. The question is actually simple but one way works the other does not?

If I call a web service from Java like this, it works:

try {
    String parameters = "<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">"+
        "<soap:Body>"+
        " <HelloWorld xmlns=\"http://np-challenger\" />"+
        "</soap:Body>"+
        "</soap:Envelope>";
    //out.println(parameters);
    java.net.URL url = new java.net.URL("http://localhost:50217/WebSite3/Service.asmx");
    java.net.HttpURLConnection connjava = (java.net.HttpURLConnection)url.openConnection();
    connjava.setRequestMethod("GET");
    connjava.setRequestProperty("Content-Length", "" + Integer.toString(parameters.getBytes().length));
    connjava.setRequestProperty("Content-Language", "en-US"); 
    connjava.setRequestProperty("Content-Type", "text/xml; charset=utf-8");
    connjava.setRequestProperty("SOAPAction", "http://np-challenger/HelloWorld");
    connjava.setDoInput(true); 
    connjava.setDoOutput(true); 
    connjava.setUseCaches(false); 
    connjava.setAllowUserInteraction(true);
    java.io.DataOutputStream printout = new java.io.DataOutputStream (connjava.getOutputStream());
    printout.writeBytes(parameters);
    printout.flush();
    printout.close();
    java.io.BufferedReader in = new java.io.BufferedReader(new java.io.InputStreamReader(connjava.getInputStream()));
    String line;            
    while ((line = in.readLine()) != null) {
        System.out.println(line);
        /*pagecontent += stuff;*/
    }
    in.close();
} catch (Exception e) {
    System.out.println("Error: "+ e);
}

However, if I try to do it like this, I keep getting a bad request. I’m just about ready to pull my hair out.

try {
    String xmlData = "<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">"+
        "<soap:Body>"+
        " <HelloWorld xmlns=\"http://np-challenger\" />"+
        "</soap:Body>"+
        "</soap:Envelope>";

    //create socket
    String hostname = "localhost";
    int port = 50217;
    InetAddress addr = InetAddress.getByName(hostname);
    Socket sock = new Socket(addr,port);

    FileWriter fstream = new FileWriter("out.txt");

    // Send header
    String path = "/WebSite3/Service.asmx";
    BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(sock.getOutputStream(), "UTF8"));
    bw.write("POST " + path + " HTTP/1.1\r\n");
    bw.write("Host: localhost\r\n");
    bw.write("Content-Type: text/xml; charset=\"utf-8\"\r\n");
    bw.write("Content-Length: " + xmlData.length() + "\r\n");
    bw.write("SOAPAction: \"http://np-challenger/HelloWorld\"");

    bw.write("\r\n");

    // Send POST data string
    bw.write(xmlData);
    bw.flush();

    // Process the response from the Web Services
    BufferedReader br = new BufferedReader(new InputStreamReader(sock.getInputStream()));
    String line;
    while ((line = br.readLine()) != null) {
        System.out.println(line);
    }
    bw.close();
    br.close();
} catch(Exception e) {
    System.err.println(e.getMessage());    
    e.printStackTrace(System.err);
}

Answer 1

It’s actually difference in data that is going to server. Monitor the data that you are actually posting using TCP Monitor. and compare the data i.e. mime header, request xml etc.

You will find the mistake. As far as I can see, first method is using GET method while second method is using POST method. I do not say that this is error just monitor actual data that is going to server and you will automatically get your problem resolved.