I am not able to view any content in the emulator while running the application. The Build is not failed and i am able run the application successfully. While i am closing the emulator i am getting an error. i can provide both code and log here.

import javax.microedition.lcdui.; import javax.microedition.midlet.; import java.io.; import java.lang.; import javax.microedition.io.; import javax.microedition.rms.;

public class Login extends MIDlet implements CommandListener { TextField ItemName=null; TextField ItemNo=null; TextField UserName=null; TextField Password=null; Form authForm,mainscreen; TextBox t = null; StringBuffer b = new StringBuffer(); private Display myDisplay = null; private Command okCommand = new Command("Login", Command.OK, 1); private Command exitCommand = new Command("Exit", Command.EXIT, 2); private Command sendCommand = new Command("Send", Command.OK, 1); private Command backCommand = new Command("Back", Command.BACK, 2); private Alert alert = null;

public Login() {
    ItemName=new TextField("Item Name","",10,TextField.ANY);
    ItemNo=new TextField("Item No","",10,TextField.ANY);
    myDisplay = Display.getDisplay(this);
UserName=new TextField("Your Name","",10,TextField.ANY);
Password=new TextField("Password","",10,TextField.PASSWORD);
authForm=new Form("Identification");
mainscreen=new Form("Logging IN");
    mainscreen.addCommand(sendCommand);
mainscreen.addCommand(backCommand);
authForm.append(UserName);
authForm.append(Password);
authForm.addCommand(okCommand);
authForm.addCommand(exitCommand);
authForm.setCommandListener(this);
myDisplay.setCurrent(authForm);
}

public void startApp() throws MIDletStateChangeException {
}

public void pauseApp() {
}



protected void destroyApp(boolean unconditional)
        throws MIDletStateChangeException {
}


public void commandAction(Command c, Displayable d) {

    if ((c == okCommand) && (d == authForm)) {
if (UserName.getString().equals("") || Password.getString().equals("")){
    alert = new Alert("Error", "You should enter Username and Password", null, AlertType.ERROR);
    alert.setTimeout(Alert.FOREVER);
    myDisplay.setCurrent(alert);
}
else{
//myDisplay.setCurrent(mainscreen);
login(UserName.getString(),Password.getString());
}
}
    if ((c == backCommand) && (d == mainscreen)) {
    myDisplay.setCurrent(authForm);
}
if ((c == exitCommand) && (d == authForm)) {
    notifyDestroyed();
}
    if ((c == sendCommand) && (d == mainscreen)) {
        if(ItemName.getString().equals("") || ItemNo.getString().equals("")){

        }
        else{
    sendItem(ItemName.getString(),ItemNo.getString());
        }
}
}



    public void login(String UserName,String PassWord) {
HttpConnection connection=null;
DataInputStream in=null;
String url="http://olario.net/submitpost/submitpost/login.php";

OutputStream out=null;
try
{
    connection=(HttpConnection)Connector.open(url);
    connection.setRequestMethod(HttpConnection.POST);
    connection.setRequestProperty("IF-Modified-Since", "2 Oct 2002 15:10:15 GMT");
    connection.setRequestProperty("User-Agent","Profile/MIDP-1.0 Configuration/CLDC-1.0");
    connection.setRequestProperty("Content-Language", "en-CA");
    connection.setRequestProperty("Content-Length",""+ (UserName.length()+PassWord.length()));
    connection.setRequestProperty("username",UserName);
    connection.setRequestProperty("password",PassWord);
out = connection.openDataOutputStream();
out.flush();
in = connection.openDataInputStream();
int ch;
while((ch = in.read()) != -1) {
    b.append((char) ch);
    //System.out.println((char)ch);
}
//t = new TextBox("Reply",b.toString(),1024,0);
//mainscreen.append(b.toString());
String auth=b.toString();
if(in!=null)
    in.close();
if(out!=null)
    out.close();
if(connection!=null)
    connection.close();

if(auth.equals("ok")){
            mainscreen.setCommandListener(this);
    myDisplay.setCurrent(mainscreen);

}
    }
catch(IOException x){

    }


    }


   public void sendItem(String itemname,String itemno){
       HttpConnection connection=null;
DataInputStream in=null;
String url="http://www.olario.net/submitpost/submitpost/submitPost.php";

OutputStream out=null;
try
{
    connection=(HttpConnection)Connector.open(url);
    connection.setRequestMethod(HttpConnection.POST);
    connection.setRequestProperty("IF-Modified-Since", "2 Oct 2002 15:10:15 GMT");
    connection.setRequestProperty("User-Agent","Profile/MIDP-1.0 Configuration/CLDC-1.0");
    connection.setRequestProperty("Content-Language", "en-CA");
    connection.setRequestProperty("Content-Length",""+ (itemname.length()+itemno.length()));
    connection.setRequestProperty("itemCode",itemname);
    connection.setRequestProperty("qty",itemno);
out = connection.openDataOutputStream();
out.flush();
in = connection.openDataInputStream();
int ch;
while((ch = in.read()) != -1) {
    b.append((char) ch);
    //System.out.println((char)ch);
}
//t = new TextBox("Reply",b.toString(),1024,0);
//mainscreen.append(b.toString());
String send=b.toString();
if(in!=null)
    in.close();
if(out!=null)
    out.close();
if(connection!=null)
    connection.close();

if(send.equals("added")){
            alert = new Alert("Error", "Send Successfully", null, AlertType.INFO);
    alert.setTimeout(Alert.FOREVER);
    myDisplay.setCurrent(alert);

}
    }
catch(IOException x){

    }

   }

}

and the log is

pre-init: pre-load-properties: exists.config.active: exists.netbeans.user: exists.user.properties.file: load-properties: exists.platform.active: exists.platform.configuration: exists.platform.profile: basic-init: cldc-pre-init: cldc-init: cdc-init: ricoh-pre-init: ricoh-init: semc-pre-init: semc-init: savaje-pre-init: savaje-init: sjmc-pre-init: sjmc-init: ojec-pre-init: ojec-init: cdc-hi-pre-init: cdc-hi-init: nokiaS80-pre-init: nokiaS80-init: nsicom-pre-init: nsicom-init: post-init: init: conditional-clean-init: conditional-clean: deps-jar: pre-preprocess: do-preprocess: Pre-processing 0 file(s) into /home/sreekumar/NetBeansProjects/Login/build/preprocessed directory. post-preprocess: preprocess: pre-compile: extract-libs: do-compile: post-compile: compile: pre-obfuscate: proguard-init: skip-obfuscation: proguard: post-obfuscate: obfuscate: lwuit-build: pre-preverify: do-preverify: post-preverify: preverify: pre-jar: set-password-init: set-keystore-password: set-alias-password: set-password: create-jad: add-configuration: add-profile: do-extra-libs: nokiaS80-prepare-j9: nokiaS80-prepare-manifest: nokiaS80-prepare-manifest-no-icon: nokiaS80-create-manifest: jad-jsr211-properties.check: jad-jsr211-properties: semc-build-j9: do-jar: nsicom-create-manifest: do-jar-no-manifest: update-jad: Updating application descriptor: /home/sreekumar/NetBeansProjects/Login/dist/Login.jad Generated "/home/sreekumar/NetBeansProjects/Login/dist/Login.jar" is 3501 bytes. sign-jar: ricoh-init-dalp: ricoh-add-app-icon: ricoh-build-dalp-with-icon: ricoh-build-dalp-without-icon: ricoh-build-dalp: savaje-prepare-icon: savaje-build-jnlp: post-jar: jar: pre-run: netmon.check: open-netmon: cldc-run: Copying 1 file to /home/sreekumar/NetBeansProjects/Login/dist/nbrun4244989945642509378 Copying 1 file to /home/sreekumar/NetBeansProjects/Login/dist/nbrun4244989945642509378 Jad URL for OTA execution: http://localhost:8082/servlet/org.netbeans.modules.mobility.project.jam.JAMServlet//home/sreekumar/NetBeansProjects/Login/dist//Login.jad Starting emulator in execution mode Running with storage root /home/sreekumar/j2mewtk/2.5.2/appdb/temp.DefaultColorPhone1 /home/sreekumar/NetBeansProjects/Login/nbproject/build-impl.xml:915: Execution failed with error code 143. BUILD FAILED (total time: 35 seconds)