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eclipsejava-meemulation
Glenncito
Glenncito

Reputation: 930

J2ME emulator does not appear to open in Eclipse

I currently have Java ME SDK 3.0.5 installed and am running a MIDLET from Eclipse.

When I run the app under the emulator device I get the following data in the console:

Syntax:

emulator [arguments]

In order to get commands supported by given device run:
emulator.exe -Xdevice:<device name> -Xquery

Generic list of arguments is:

-version           Display version information about the emulator
-help              Display list of valid arguments
-classpath, -cp    The class path for the VM
-D<name>=<value>   Set a system property
-Xdebug            Use a remote debugger
-Xrunjdwp:[transport=<transport>,address=<address>,server=<y/n>,
       suspend=<y/n>]
                   Debugging options
-Xdevice:<device>  Select a device skin for the emulator
-Xdomain:<domain_name>
               Set the MIDlet suite's security domain
-Xmain:<main class name>
                   Run the main method of a Java class, as in Java SE
-Xquery            Print device information

Everything seems to be alright, but I can't get any form of emulation to appear.

here is the code of my MIDLET, although I don't think the problem lies here.

 import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
import javax.microedition.lcdui.*;

public class Hello extends MIDlet implements CommandListener {

private Command exitCommand;
private Display display;
private Form screen;

public Hello() {
display = Display.getDisplay(this);

exitCommand = new Command ("Exit", Command.EXIT, 2);

screen = new Form ("Hello World");

StringItem strItem = new StringItem ("","Hello World");
screen.append (strItem);

screen.addCommand (exitCommand);
screen.setCommandListener(this);
}

public void startApp() throws MIDletStateChangeException {
    // set the current display to the screen
    display.setCurrent(screen);

}

public void pauseApp() {
    // TODO Auto-generated method stub

}


public void destroyApp(boolean unconditional)  {
    // TODO Auto-generated method stub

}


public void commandAction (Command c, Displayable s) 
{
    if (c == exitCommand) 
    {
        destroyApp (false);
        notifyDestroyed();
    }
}

}

Upvotes: 1

Views: 2382

Answers (5)

madhuka
madhuka

Reputation: 101

Here is post how to run jar from emulator (Java ME SDK 3.0.5)

(How to run MIDLET in Java ME SDK 3.0.5 ::http://madhukaudantha.blogspot.com/2012/10/how-to-run-midlet-in-java-me-sdk-305.html

Upvotes: 0

Karuna Sorate
Karuna Sorate

Reputation: 173

I had a similar problem while running a basic JavaMe app on eclipse, "Corrupt JAR, error while reading". It worked for me after I followed this series for starters http://help.eclipse.org/galileo/index.jsp?topic=/org.eclipse.mtj.doc.user/html/gettingstarted/prepare_workbench.html (try not to miss anything mentioned here).
Note, when you launch the app, use "Launch as emulated Java ME JAD"(-in the top right "Running" section on the page) from the "Application descriptor" (-from left menu.)

This is a late reply but might just help someone in future.

Upvotes: 1

Vimal
Vimal

Reputation: 1266

If you are adventurous and want to develop / run JavaME application without IDE's than I have some ray of hope, write a batch script (or shell script for linux system) to manually run the emulator with specific jad

Batch Script (run.bat)

"<javame-3.0-sdk-root-folder>\bin\emulator.exe" 
                   -Xdescriptor:"<jad-filename-with-extension>" >> logs.txt
pause
exit

save the above script in the same folder as the application jad/jar. The console prints will be available in log.txt file.

Upvotes: 0

Glenncito
Glenncito

Reputation: 930

I switched over to Netbeans, which has integrated support for J2ME (as opposed to having to install a 3rd party plugin for Eclipse) and it now works perfectly.

Upvotes: 1

Michael
Michael

Reputation: 7448

The output is pretty simple, it's telling you that the command line syntax to the emulator is incorrect.

Go to the Java ME device settings and edit the emulator command line / start options to suit.

Switching IDE's may work for you as a short-term fix, but it's always better to get to the root of the issue. Plus it'll help you understand the emulator framework.

Upvotes: 3

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