Application hang for long time (unable to load)

Question

hi and a very good day to all..
i am a new user of J2ME and i am currently using Sun Wireless Toolkit to run a sample program. But, there are some error occur when i open it from the Open Project in Sun Wireless Toolkit. Once i click the launch button on the emulator, it will show the graphic but with a statement 'Please Wait'. it seems like my application is going happen to hang for quite a long time (i even can't open it at all). it happen every time i open my project and i unable to load my program successfully. i want 2 ask, is it because of teh coding? or my pc? or the Sun Wireless Toolkit itself? i never change/edit the coding, since this the sample application of Mobile Compass i downloading from the internet.
there are bundle of code in my application (single application)..but the error 'Please Wait' basically come from 1 of the coding. i'll show it below:
**THE CODE**
package org.qcontinuum.compass;
import javax.microedition.lcdui.*;
import java.util.*;
abstract public class Progress extends Form implements CommandListener, Runnable {
private Displayable mParent;
private Command mCancelCommand;
private Thread mThread;
// private Timer mTimer;
public Progress(String title, Displayable parent) {
super(title);
mParent = parent;
append(new StringItem(null, "Please wait...\n"));
addCommand(mCancelCommand = new Command("Cancel", Command.CANCEL, 0));
setCommandListener(this);
mThread = new Thread(this);
public void start() {
mThread.start();
abstract public void run();
public void commandAction(Command c, Displayable d) {
if (c == mCancelCommand) {
Compass.display(mParent);
p/s: is it the above error related to java.lang.NullPointerException? this is because, with unexpected situation, suddenly the compass program able to download successfully (only sometime), but still it give some error like below, and i still can select the Time Zone for my destination chosen from the given map.
java.lang.NullPointerException
     at java.io.DataInputStream.read(+4)
     at java.io.DataInputStream.readUnsignedShort(+4)
     at java.io.DataInputStream.readUTF(+6)
     at java.io.DataInputStream.readUTF(+4)
     at org.qcontinuum.compass.TimeZone.load(+6)
     at org.qcontinuum.compass.TimeZone.<init>(+9)
     at org.qcontinuum.compass.TimeZone.getZones(+36)
     at org.qcontinuum.compass.LocationTimeZone.<init>(+89)
     at org.qcontinuum.compass.LocationMap.locationSelected(+22)
     at org.qcontinuum.compass.MapCanvas.moveImage(+282)
     at org.qcontinuum.compass.MapCanvas.keyPressed(+22)
     at javax.microedition.lcdui.Canvas.callKeyPressed(+19)
     at javax.microedition.lcdui.Display$DisplayAccessor.keyEvent(+198)
     at javax.microedition.lcdui.Display$DisplayManagerImpl.keyEvent(+11)
     at com.sun.midp.lcdui.DefaultEventHandler.keyEvent(+127)
     at com.sun.midp.lcdui.AutomatedEventHandler.keyEvent(+210)
     at com.sun.midp.lcdui.DefaultEventHandler$QueuedEventHandler.handleVmEvent(+114)
     at com.sun.midp.lcdui.DefaultEventHandler$QueuedEventHandler.run(+57)
can someone help me on this. i really need the answer for this solution. i am still new and in the process of leaning. Thanks a lot and hope all of u can help me. May God bless u. The reference for the above sample program is at http://http://qcontinuum.org/compass/index.htm
Regards,
Miss Iera

Answer 1

Hi,
Do you have variable replaced by another query? If that is case, you will get performance issue, when the prequery is runnig when call var screen.
Do you have variable replaced by authorization? If that is case, for the user will complicated authroization, it will take some time to fill it.
In general, when the variable screen is calling, have you check in sm66, what is the work process doing? In RSRT->run this query with statistics, which part takes most time?