Erro usando Lwuit

Mobile
#1

Pessoal tenho o seguinte midlet de teste…

import com.sun.lwuit.CheckBox;

import com.sun.lwuit.Dialog;
import com.sun.lwuit.Display;
import com.sun.lwuit.Command;
import com.sun.lwuit.Font;
import com.sun.lwuit.Form;
import com.sun.lwuit.Label;
import com.sun.lwuit.events.ActionEvent;
import com.sun.lwuit.events.ActionListener;
import com.sun.lwuit.geom.Dimension;
import com.sun.lwuit.plaf.Border;
import com.sun.lwuit.plaf.Style;
import com.sun.lwuit.plaf.UIManager;
import javax.microedition.midlet.MIDlet;

public class DemoCheckBox extends MIDlet implements ActionListener
{
private final int cbQty = 6;//number of checkboxes
private CheckBox[] checkboxes = new CheckBox[cbQty];

//if true all selections will be cleared on return from dialog
private boolean reset;

public void startApp()
{
   		//initialize the LWUIT Display
	//and register this MIDlet
   		Display.init(this);

	//create a new form
	Form demoForm = new Form("CheckBox Demo");

	//create a font
	Font font = Font.createSystemFont(Font.FACE_PROPORTIONAL,Font.STYLE_BOLD,Font.SIZE_LARGE);

	//set text color for title
	demoForm.getTitleStyle().setFgColor(0xffffff);

	//set font style for title
	demoForm.getTitleStyle().setFont(font);

	//set background color for the title bar
	demoForm.getTitleStyle().setBgColor(0xff8040);

	//create a new style object
	Style menuStyle = new Style();

	//set the background color -- the same as for title bar
	menuStyle.setBgColor(0xff8040);

	//set the text color for soft button
	menuStyle.setFgColor(0xffffff);

	//set font style for soft button
	menuStyle.setFont(font);

	//now install the style for soft button
	demoForm.setSoftButtonStyle(menuStyle);

	//set a background color for the form
	demoForm.getStyle().setBgColor(0x656974);

	//make the content pane fully transparent
	demoForm.getContentPane().getStyle().setBgTransparency(0);

	//create and add 'Exit' command to the form
	//the command id is 0
	demoForm.addCommand(new Command("Exit", 0));
	demoForm.addCommand(new Command("Confirm", 1));

	//this MIDlet is the listener for the form's command
	demoForm.setCommandListener(this);

	//create a style for labels
	Style labelStyle = new Style();
	labelStyle.setBgTransparency(0);
	labelStyle.setFgColor(0x00ffff);
	labelStyle.setFont(font);
	labelStyle.setMargin(Label.BOTTOM, 30);

	//set the style for all labels
	UIManager.getInstance().setComponentStyle("Label", labelStyle);

	//create a label to explain the purpose of the checkboxes
	Label expLabel = new Label("Select all languages known");

	//add the label to the form
	demoForm.addComponent(expLabel);

	//create font for checkboxes
	Font cbFont = Font.createSystemFont(Font.FACE_PROPORTIONAL,Font.STYLE_PLAIN,Font.SIZE_MEDIUM);

	//create a style for checkboxes
	Style cbStyle = new Style();
	cbStyle.setBgTransparency(64);
	cbStyle.setFgColor(0x00ffff);
	//cbStyle.setFgSelectionColor(0x00ff00);
	cbStyle.setBgColor(0x999900);
	//cbStyle.setBgSelectionColor(0xaa0000);
	cbStyle.setFont(cbFont);
	cbStyle.setBorder(Border.createEtchedRaised());
	cbStyle.setMargin(Label.BOTTOM, 10);

	//set the style for all checkboxes
	UIManager.getInstance().setComponentStyle("CheckBox", cbStyle);

	//strings for checkbox texts
	String[] langs = {"Chinese", "Spanish", "English", "Portuguese", "Hindi", "Bengali"};

	//preferred dimensions for checkboxes
	Dimension d1 = new Dimension(100, 25);

	//create six checkboxes and add them to the form
	for(int i = 0; i < cbQty; i++)
	{
		//create a checkbox
		checkboxes[i] = new CheckBox(langs[i]);

		//set its preferred size
		checkboxes[i].setPreferredSize(d1);

		//set right margin for first, third and fifth checkboxes
		//this is to provide a gap between the two columns of checkboxes
		//and is a device specific approach
		if(i % 2 == 0)
		{
			checkboxes[i].getStyle().setMargin(Label.RIGHT, 15);
		}

		//add checkbox to form
		demoForm.addComponent(checkboxes[i]);
	}

	//set border for form title bar
	demoForm.getTitleStyle().setBorder(Border.createBevelRaised());

	//set border for form menu bar
	demoForm.getSoftButtonStyle().setBorder(Border.createBevelLowered());

	//show the form
   		demoForm.show();
}

public void pauseApp()
{
}

public void destroyApp(boolean unconditional)
{
}

//act on the command
public void actionPerformed(ActionEvent ae)
{
	Command cmd = ae.getCommand();

    	switch (cmd.getId())
	{
		//'Exit' command
		case 0:
  				notifyDestroyed();
			break;

		//'Confirm' command
		case 1:
			//call method to display dialog
			showDialog();

			//on retun from showDialog method
			//check whether reset is true
			if(reset)
			{
				//it's true, first set reset to false
				//to make it ready for next time
				reset = false;

				//check each checkbox
				for(int i = 0; i < cbQty; i++)
				{
					//check its state
					if(checkboxes[i].isSelected())
					{
						//it's selected so clear it
						checkboxes[i].setSelected(false);
					}
				}
			}
	}
}

private void showDialog()
{
	int j = 0;

	//dimension of labels to display selections
	Dimension dim = new Dimension(100, 25);

	//create the dialog
	Dialog d = new Dialog("Selection");

	//give it a border
	d.getContentPane().getStyle().setBorder(Border.createBevelRaised());

	//font for the labels
	Font f = Font.createSystemFont(Font.FACE_SYSTEM,Font.STYLE_PLAIN,Font.SIZE_MEDIUM);
	
	//create labels as required
	for(int i = 0; i < cbQty; i++)
	{
		//see if a checkbox is selected
		if(checkboxes[i].isSelected())
		{
			//it is selected so create a label to show its text
			Label l = new Label(checkboxes[i].getText());

			//set preferred size of the label
			l.setPreferredSize(dim);

			//set color for the text on labels
			l.getStyle().setFgColor(0x555555);

			//set font for the text on labels
			l.getStyle().setFont(f);

			//set a small botom margin
			//again, this is a device specific action
			l.getStyle().setMargin(Label.BOTTOM, 5);

			//add the label to the form
			d.addComponent(l);
		}
	}

	//set bg color for dialog
	d.getContentPane().getStyle().setBgColor(0xff8040);

	//set style attributes for the dialog titlebar
	d.getTitleStyle().setBgColor(0xa43500);
	d.getTitleStyle().setFgColor(0xffffff);
	d.getTitleStyle().setFont(Font.createSystemFont(Font.FACE_SYSTEM,Font.STYLE_BOLD,Font.SIZE_MEDIUM));
	d.getTitleStyle().setBorder(Border.createBevelRaised());

	//create and set style for dialog menubar
	Style s = new Style();
	s.setBgColor(0xa43500);
	s.setFgColor(0xffffff);
	s.setFont(Font.createSystemFont(Font.FACE_SYSTEM,Font.STYLE_BOLD,Font.SIZE_MEDIUM));
	s.setBorder(Border.createBevelRaised());
	d.setSoftButtonStyle(s);

	//add two commands to dialog
	d.addCommand(new Command("OK"));
	d.addCommand(new Command("Back"));

	//show the dialog
	//this method will return the command selected when dialog is closed
	Command cmd = d.showDialog();

	//check the command name
	if(cmd.getCommandName().equals("OK"))
	{
		//it's 'OK' command so set reset to true
		//so that all selections can be cleared
		reset = true;
	}
}

}

[b]Quando eu tento rodar da o seguinte erro

Running with storage root C:\Users\emerson\j2mewtk\2.5.2\appdb\DefaultColorPhone
Running with locale: Portuguese_Brazil.1252
Running in the identified_third_party security domain
java.lang.NoClassDefFoundError: DemoCheckBox: com/sun/lwuit/events/ActionListener
at com.sun.midp.midlet.MIDletState.createMIDlet(+29)
at com.sun.midp.midlet.Scheduler.schedule(+52)
at com.sun.midp.main.Main.runLocalClass(+28)
at com.sun.midp.main.Main.main(+80)
Execution completed.[/b]

Alguém sabe como resolver?

#2

Qual é o ambiente de desenvolvimento que vc está usando? Há algum tempo atrás estava tentando rodar o lwuit no eclipse + mjt + java me sdk3 e aconteceu um erro parecido com o seu. Tente rodar esse código na própria ide do Java ME SDK 3.0 e verifique se o erro persiste.
E por favor, da próxima vez que for postar código, utilize as tags (code)( /code).

Boa sorte!

#3

Este erro está acontecendo no eclipse mesmo.

Mudei para o Netbeans e este erro não acontece mais.

#4