Uncaught exception on HttpConnection when the URL is blocked

I access my request, a service URL web restful. Whenever the device is connected, but the URL is not accessible or non-responsive for some reason, I get an untrapped exception. All I want is to catch the exception and displays an appropriate message.

Ideally, I'd like

1. check whether the URL is accessible

2. wait a little longer if the URL is accessible but slow

Please suggest. Thank you.

Code: (relevant articles)

    public void fieldChanged(Field field, int context) {

        if (field == btnOK) {
            UiApplication.getUiApplication().invokeLater(new Runnable() {

                public void run() {
                                String value=VerifyPinCode(rdPinCode.getText(),rd.getText());

                                if (value.substring(0,4).equals("true")) {
                                                                        // do stuff
                                } else {
                                    count = count++;
                                }
                              }
            });

        } else if (field == btnCancel) {
            close();
        }

    }

    public String VerifyPinCode(String PinCode, String VRN) {
        try {

            if (WebService.CheckConn())
                    {
                        try{
                    WebService wb = new WebService(
                            "http://webservice.somewhere.com:8088/mywebservice.svc/WebTestMethod/"
                                        + VRN
                                    + "/" + PinCode);
                           wb.start();
                    wb.join();
                    Responce = wb.Call();
                    }
                    catch(InterruptedException  ex)
                    {
                        Dialog.alert("No Internet Connection");
                    }
                }

public class WebService extends Thread {
    static HttpConnection con = null;
    static InputStream is = null;
    static StringBuffer rawResponse;
    String URL;
    public String resultant;

    WebService(String url) {
        URL = url + getConnectionString() + ";ConnectionTimeout=20000";

    }

    public void run() {

        try {
            con = (HttpConnection) Connector.open(URL, Connector.READ_WRITE,
                    true);
            int rcc = con.getResponseCode();

        } catch (IOException e) {
            // TODO Auto-generated catch block
            con = null;
            // Status.show(e.getMessage());
        }

        //catch (Exception ex) {
        // TODO Auto-generated catch block
        //con = null;
        // Status.show(e.getMessage());
        //}

    }

    public String Call() {
        try {

            // ConnectionTimeout=9000;";
            if (CheckConn()) {

                if (con == null) {
                    rawResponse = new StringBuffer();
                    rawResponse.append("Timed out");

                } else {
                    is = con.openInputStream();
                    // // Status.show("3");

                    byte[] responseData = new byte[10000];
                    int length = 0;
                    rawResponse = new StringBuffer();
                    while (-1 != (length = is.read(responseData))) {
                        rawResponse.append(new String(responseData, 0, length));
                        // Status.show("4");

                    }
                }
            } else {
                Status.show("Internet service is not avaiable.");
            }
            // Status.show(result);

        } catch (Exception ex) {
            Status.show("Internet is not responding");
        } finally {
            try {
                if (is != null) {
                    is.close();
                }
                if (con != null) {
                    con.close();
                }
            } catch (Exception e) {
                // Status.show(e.getMessage());
            }
        }
        return rawResponse.toString();

    }

    public String getConnectionString() {

        String connectionString = "";
        if (WLANInfo.getWLANState() == WLANInfo.WLAN_STATE_CONNECTED) {
            connectionString = ";interface=wifi";
        }

        else if ((CoverageInfo.getCoverageStatus() & CoverageInfo.COVERAGE_MDS) == CoverageInfo.COVERAGE_MDS) {
            connectionString = ";deviceside=false";
        } else if ((CoverageInfo.getCoverageStatus() & CoverageInfo.COVERAGE_DIRECT) == CoverageInfo.COVERAGE_DIRECT) {
            String carrierUid = getCarrierBIBSUid();
            if (carrierUid == null) {
                connectionString = ";deviceside=true";
            } else {
                connectionString = ";deviceside=false;connectionUID="
                        + carrierUid + ";ConnectionType=amdeeas-public";
            }
        } else if (CoverageInfo.getCoverageStatus() == CoverageInfo.COVERAGE_NONE) {
            connectionString = ";None";

        }

        return connectionString;
    }

    public String getCarrierBIBSUid() {

        net.rim.device.api.servicebook.ServiceRecord[] records = ServiceBook
                .getSB().getRecords();
        int currentRecord;

        for (currentRecord = 0; currentRecord < records.length; currentRecord++) {
            if (records[currentRecord].getCid().toLowerCase().equals("ippp")) {
                if (records[currentRecord].getName().toLowerCase()
                        .indexOf("bibs") >= 0) {
                    return records[currentRecord].getUid();
                }
            }
        }

        return null;
    }

    public static boolean CheckConn() {
        try {
            if (WLANInfo.getWLANState() == WLANInfo.WLAN_STATE_CONNECTED) {
                return true;
            } else if (CoverageInfo.getCoverageStatus() >= 2) {
                return true;
            } else if (CoverageInfo.getCoverageStatus() == CoverageInfo.COVERAGE_DIRECT) {
                return false; //false for device, true for simulator
            } else {
                return false;
            }
        } catch (Exception ex) {
            Dialog.alert("No Internet Connection");
            return false;
        }
    }

}

remove the thread.join and the call to Call(), you block the user interface and the device to start a thread at all.
To get a response from the thread, you can use the callback model, for example.

Tags: BlackBerry Developers

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I use the 'trap' to catch the exception like below:
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Hello

The reason you're trap code is not executed because the trap block intercepts only the errors, but the error you get is non-terminating. You can set the world
```
$ErrorActionPreference = "Stop"
```
or the cmdlet the ErrorAction parameter:
```
Get-VMhost 192.168.43.110 -ErrorAction:Stop
trap {
"Exception when get-vmhost"
}
```
You can take a look at this thread Re: how to catch the VimExceptions correctly? also

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Sruthi Tamiri wrote:

In our application, we wrote this logic as shown below

Before the point of the process of the header: On Load before header.
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