help in J2Me

[nor alain]

Hi all,

I wanna help in my code ..

I wrote some code that when the user select particular category, all places under that catgeory will retreive from database and appears in the windows as a list ...

This is the code:

public Screen CategoryListAction() {

try {
int a = CategoryList.getSelectedIndex();
PlaceList = new List("Select Place", Choice.IMPLICIT);
int i = 0;
// try{
stub = new NewWebServiceService_Stub();
getBranches = stub.findAll();
getPlaces = stub.findAllX(); // getCom
getCategories = stub.findAllY(); // getCat
String __selectedString = getCategoryList().getString(getCategoryList().getSelectedIndex());
if (__selectedString != null) {
if (__selectedString.equals("Hospital")) {
try{
for (int j = 0; j < getCategories.length; j++) {
if (getCategories[i].getCateName().toLowerCase() == "Hospital".toLowerCase()) {
String ind = getCategories[i].getCateId();
for (i = 0; i < getPlaces.length; i++) {
if (getPlaces[i].getCateId() == ind) {
PlaceList.append(getPlaces[i].getPlaceName(), null);
PlaceList.addCommand(getBackCommand3());
PlaceList.addCommand(getExitCommand3());
PlaceList.addCommand(getCancelCommand4());
PlaceList.setCommandListener(this);
return PlaceList;
}
}
}
}
} catch (Exception e){
e.printStackTrace();
}
return PlaceList;
} else if (__selectedString.equals("Hotel")) {
return null;
} else if (__selectedString.equals("School")) {
return null;
} else if (__selectedString.equals("University")) {
return null;
}
}
} catch (RemoteException ex) {
ex.printStackTrace();
}
return PlaceList;
}

But, when i run the emulator, it works correctly before this step ..

The following window i appear



( The emulator here is stop working)

and this is the message that appears in the netbeans:

Warning: To avoid potential deadlock, operations that may block, such as
networking, should be performed in a different thread than the
commandAction() handler.

Can you help me, please ?[/img]

[Tim Holloway]

They're given you advice. I recommend you take it!

[Peter Miklosko]

Have look at BaldassareMidlet from chapter 18 of Kicking Butt with MIDP and MSA by Jonathan Knudsen for idea how to do this sort of job with Threads

[nor alain]

I use the thread in the code, but still have the sam problem

public Screen CategoryListAction (){
try {
int a = CategoryList.getSelectedIndex();
PlaceList = new List("Select Place", Choice.IMPLICIT);
stub = new NewWebServiceService_Stub();
getPlaces = stub.findAllX(); // getCom
getCategories = stub.findAllY(); // getCat
String __selectedString = getCategoryList().getString(getCategoryList().getSelectedIndex());
if (__selectedString != null) {
if (__selectedString.equals("Hospital")) {
new Thread(new Runnable() {
public void run() {
for (int j = 0; j < getCategories.length; j++) {
if (getCategories[j].getCateName().toLowerCase() == "Hospital".toLowerCase()) {
String ind = getCategories[j].getCateId();
for (int i = 0; i < getPlaces.length; i++) {
if (getPlaces[i].getCateId() == ind) {
PlaceList.append(getPlaces[i].getPlaceName(), null);
PlaceList.addCommand(getBackCommand3());
PlaceList.addCommand(getExitCommand3());
PlaceList.addCommand(getCancelCommand4());
// PlaceList.setCommandListener(this);
// PlaceList.setCommandListener(this);}
}
}
}
}
});
return PlaceList;
} else if (__selectedString.equals("Hotel")) {
return null;
} else if (__selectedString.equals("School")) {
return null;
} else if (__selectedString.equals("University")) {
return null; }
}
} catch (RemoteException ex) {
ex.printStackTrace(); }
return PlaceList; }

[Amila Jayatillaka]

  public Screen CategoryListAction() {
        try {
            int a = CategoryList.getSelectedIndex();
            PlaceList = new List("Select Place", Choice.IMPLICIT);
            stub = new NewWebServiceService_Stub();
            getPlaces = stub.findAllX(); // getCom
            getCategories = stub.findAllY(); // getCat
            String __selectedString = getCategoryList().getString(getCategoryList().getSelectedIndex());
            if (__selectedString != null) {
                if (__selectedString.equals("Hospital")) {
                    new Thread(new Runnable() {

                        public void run() {
                            for (int j = 0; j < getCategories.length; j++) {
                                if (getCategories[j].getCateName().toLowerCase() == "Hospital".toLowerCase()) {
                                    String ind = getCategories[j].getCateId();
                                    for (int i = 0; i < getPlaces.length; i++) {
                                        if (getPlaces[i].getCateId() == ind) {
                                            PlaceList.append(getPlaces[i].getPlaceName(), null);
                                            PlaceList.addCommand(getBackCommand3());
                                            PlaceList.addCommand(getExitCommand3());
                                            PlaceList.addCommand(getCancelCommand4());
                                            // PlaceList.setCommandListener(this);
                                            // PlaceList.setCommandListener(this);}
                                        }
                                    }
                                }
                            }
                        });
                        return PlaceList;
                }  else if (__selectedString.equals("Hotel")) {
                    return null;
                } else if (__selectedString.equals("School")) {
                    return null;
                } else if (__selectedString.equals("University")) {
                    return null;
                }
            }
        } catch (RemoteException ex) {
            ex.printStackTrace();
        }
        return PlaceList;
    }  

Well next time when you put a code please format it well and put it inside a code tag like this ...
because it's easy to read

[nor alain]

Ok,

Is there anyone can help me, please ?

[Amila Jayatillaka]

well i'm not that familiar with web services... but up to what this code runs.... i mean from the code given by you, is it running after line number 5
because i think there you are trying to create the connection to the web service....
So just put your connection part into a thread and see if it works....