HTTP connection problem. What is going on?

I am trying to write a simple program to test the validity of the URL via a http connection.

For the good URL, the program works very well.

Bad URL however found two ways:

1: no answer at all (program runs as if nothing happened, waiting for user input.) The text in the EditField is the same incorrect url intentionally being tested)

2: IllegalArgumentException in RIMConnector.open (int, int, String, boolean, FirewallContext) line: 76.

What is going on?

Here is the code:

import java.io.IOException;
import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import net.rim.device.api.ui.*;
import net.rim.device.api.ui.component.*;
import net.rim.device.api.ui.container.*;
import net.rim.device.api.ui.UiApplication;

final class UrlCheck extends UiApplication {
    private EditField urlField;
    public static void main(String[] args) {
        UrlCheck theApp = new UrlCheck();
        theApp.enterEventDispatcher();
    }

    public UrlCheck() {
        MainScreen theScreen = new MainScreen();
        LabelField title = new LabelField("URL Check");
        theScreen.setTitle(title);

        urlField = new EditField("URL: ", "", Integer.MAX_VALUE, BasicEditField.FILTER_DEFAULT);
        theScreen.add(urlField);

        FieldChangeListener listenerCancel = new FieldChangeListener() {
            public void fieldChanged(Field field, int context) {
                String URL = urlField.getText();
                HttpConnection conn = null;
                int response = 0;
                try {
                    conn = (HttpConnection)Connector.open(URL);
                    conn.setRequestMethod(HttpConnection.GET);
                    response = conn.getResponseCode();
                    if (response == 200){
                        Dialog.inform("URL OK");
                        return;
                    }
                    if(response == 401){
                        Dialog.inform("URL Requires Authorization");
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                    Dialog.inform("Bad URL");
                }
            }
        };
        ButtonField checkUrl = new ButtonField("Check");
        checkUrl.setChangeListener(listenerCancel);
        theScreen.add(checkUrl);
        pushScreen(theScreen);
    }
}

Okay, that was stupid.

I caught the IllegalArgumentException as well and it fixed the problem.

Tags: BlackBerry Developers

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