Question

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You must include the platform port before the LWUIT in the classpath runtime exception

I am just now started the LWUIT use in J2ME. I don’t have more knowledge of LWUIT but I know better J2ME. I have added library of LWUIT in my J2ME project, it’s compiling fine but at run time it is showing below exception:

java.lang.RuntimeException: You must include the platform port before the LWUIT in the classpath
    at com.sun.lwuit.impl.ImplementationFactory.createImplementation(ImplementationFactory.java:67)
    at com.sun.lwuit.Display.init(Display.java:406)
    at HelloMidlet.<init>(HelloMidlet.java:26)
    at java.lang.Class.newInstance(), bci=0
    at com.sun.midp.main.CldcMIDletLoader.newInstance(), bci=46
    at com.sun.midp.midlet.MIDletStateHandler.createMIDlet(), bci=66
    at com.sun.midp.midlet.MIDletStateHandler.createAndRegisterMIDlet(), bci=17
    at com.sun.midp.midlet.MIDletStateHandler.startSuite(), bci=27
    at com.sun.midp.main.AbstractMIDletSuiteLoader.startSuite(), bci=52
    at com.sun.midp.main.CldcMIDletSuiteLoader.startSuite(), bci=8
    at com.sun.midp.main.AbstractMIDletSuiteLoader.runMIDletSuite(), bci=161
    at com.sun.midp.main.AppIsolateMIDletSuiteLoader.main(), bci=26

How to solve this problem?

Below is my code:

import com.sun.lwuit.*;
import com.sun.lwuit.animations.CommonTransitions;
import com.sun.lwuit.animations.Transition3D;
import com.sun.lwuit.events.*;
import com.sun.lwuit.layouts.BorderLayout;
import com.sun.lwuit.layouts.BoxLayout;
import com.sun.lwuit.plaf.UIManager;
import com.sun.lwuit.util.Resources;
import java.io.IOException;

public class HelloMidlet extends MIDlet implements ActionListener {
    private Form form1;
    private Form form2;

    private Command cmdRotate = new Command("Rotate");
    private Command cmdSlide = new Command("Slide");
    private Command cmdExit = new Command("Exit");
        public HelloMidlet(){
            Display.init(this);
        }
  public void startApp() {
        Resources r;
        try{
            r=Resources.open("/TimelineTheme.res");
            UIManager.getInstance().setThemeProps(r.getTheme("LWUITDefault"));
        }catch (IOException e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        form1 = new Form("Form 1");
        form1.setLayout(new BorderLayout());
        form1.addComponent(BorderLayout.NORTH, new Label("My First Form"));
        form1.addComponent(BorderLayout.WEST, new Label("WEST"));
        form1.addComponent(BorderLayout.CENTER, new Label("CENTER"));
        form1.addComponent(BorderLayout.EAST, new Label("EAST"));
        form1.addComponent(BorderLayout.SOUTH, new Label("Click Rotate"));
        form1.addCommand(cmdRotate);
        form1.addCommand(cmdExit);
        form1.addCommandListener(this);
        form1.setTransitionInAnimator(CommonTransitions.createSlide(
                    CommonTransitions.SLIDE_HORIZONTAL, true, 1000));

        //Setup Form 2
        form2 = new Form("Form 2");
        form2.setLayout(new BoxLayout(BoxLayout.Y_AXIS));
        form2.addComponent(0,null,new Label("This is the second Form"));
        form2.addCommand(cmdSlide);
        form2.addCommand(cmdExit);
        form2.addCommandListener(this);
        form2.setTransitionInAnimator(Transition3D.createCube(1000, true));

        form1.show();
  }

  public void pauseApp() {}

  public void destroyApp(boolean unconditional) {}

  public void actionPerformed(ActionEvent ae) {
   if (ae.getCommand()==cmdExit) {
            notifyDestroyed();
        } else if (ae.getCommand()==cmdRotate) {
            form2.show();
        } else if (ae.getCommand()==cmdSlide) {
            form1.show();
        }
  }
}

Answer 1

Did you see that post? You must include the platform port before the LWUIT in the classpath runtime exception

I think that this is a similar problem. Try to solve it, as suggested in the answer in above question:

The problem was that in the UI jar I was including. LWUIT comes with 2
“sets” of UI.jar. The generic one which is in LWUIT\UI folder and the
platform specific ones which are in the LWUIT\Ports folder.The generic
one is being used as “parent” project containing all the common
code,however if you MUST import the .jar file which is for your
platform. As readme file says:

While these projects will compile easily they will be useless for any purpose since they don’t include the binding glue for the
platform, to use the platform one needs to use the appropriate
projects underneath the specific ports directory to a given platform.

While I was recompiling the library in order to remove
Transitions3D.java file, I recompiled (and then imported ) the generic
UI.jar. The correct thing to do is compile, the parent project (the
generic UI.jar) THEN compile the port specific library (in my case the
LWUIT\ports\MIDP\UI.jar) and then import it in your project and you
are done.