NullPointerException on PersistentObject problem
* Update * I can solve the problem now! I did not know that I have to put a comment with the string KEY in the code... how silly I am (> / / /)<>
Hello!
I'm developing an application with EditField. I need the EditField to store it that the user entered, so I tried to write the code (using the example found on the Internet)...
private static PersistentObject myobject;
static
{
//*****I have no idea what 0xe63e08aacd575338L is, just copy it from the Internet...
myobject = PersistentStore.getPersistentObject(0xe63e08aacd575338L);
}
String[]storedV = (String[])myobject.getContents();
if (storedV != null)
{
f1Field.setText(storedV[0]);
f2Field.setText(storedV[1]);
}
f1Field = new EditField("Username:","");
add(f1Field);
f2Field = new PasswordEditField("Password:","");
add(f2Field);
String unameToSave = f1Field.getText();
String pwdToSave = f2Field.getText();
String[] storeV = {unameToSave,pwdToSave};
synchronized(myobject)
{
myobject.setContents(storeV);
myobject.commit();
}
With this code, everything went well when I run for the first time (if there is no value stored in PersistentStore).
When I run for the second time, I got "Eception Exception: NullPointerException ' on the line
f1Field.setText(storedV[0]);
Please help me!
Thanks in advance for any answer!
PS. I use this Simulator 8520...
0xe63e08aacd575338L is, just copy it from the Internet...
Do not copy a key key somene else... or you will eventually damage the memory of each and other. Use a unique key, pass around some of these figures in something different
Regarding the nullpointer, try to add a control to ensure that the field is not null
Tags: BlackBerry Developers
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-----
Thank you very much
AndrasI don't think the explosion engine can find the format model. Check the regional settings on your model of format and locale for breaking settings see if they match.
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Forgive and I would like to make a short story.
Days, I am according to the A13_Storing_Persistent_Data_V2 document and fantasize for only a class useful for my application, but I am failed completely, here is that the source code written in the document.
import net.rim.device.api.ui.*; import net.rim.device.api.ui.component.*; import net.rim.device.api.ui.container.*; import net.rim.device.api.system.*; import net.rim.device.api.util.*; import java.util.*; public class MusicStores extends UiApplication { private AutoTextEditField namefield; private AutoTextEditField addressfield; private EditField phonefield; private EditField specialtyfield; private static Vector _data; private static PersistentObject store; public static void main(String[] args) { MusicStores app = new MusicStores(); app.enterEventDispatcher(); } public MusicStores() { MainScreen mainScreen = new MainScreen(); mainScreen.setTitle(new LabelField("Favourite Music Store")); namefield = new AutoTextEditField("Store Name: ", ""); addressfield = new AutoTextEditField("Address: ", ""); phonefield = new EditField("Phone Number: ", "", Integer.MAX_VALUE, BasicEditField.FILTER_PHONE); specialtyfield = new EditField("Music Type: ", "", Integer.MAX_VALUE, BasicEditField.FILTER_DEFAULT); mainScreen.add(namefield); mainScreen.add(addressfield); mainScreen.add(phonefield); mainScreen.add(specialtyfield); mainScreen.addMenuItem(saveItem); mainScreen.addMenuItem(getItem); pushScreen(mainScreen); } private MenuItem saveItem = new MenuItem("Save", 110, 10) { public void run() { StoreInfo info = new StoreInfo(); info.setElement(StoreInfo.NAME, namefield.getText()); info.setElement(StoreInfo.ADDRESS, ddressfield.getText()); info.setElement(StoreInfo.PHONE, phonefield.getText()); info.setElement(StoreInfo.SPECIALTY, specialtyfield.getText()); _data.addElement(info); synchronized (store) { store.setContents(_data); store.commit(); } Dialog.inform("Success!"); namefield.setText(null); addressfield.setText(null); phonefield.setText(""); specialtyfield.setText(""); } }; private MenuItem getItem = new MenuItem("Get", 110, 11) { public void run() { synchronized (store) { _data = (Vector) store.getContents(); if (!_data.isEmpty()) { StoreInfo info = (StoreInfo) _data.lastElement(); namefield.setText(info.getElement(StoreInfo.NAME)); addressfield.setText(info.getElement(StoreInfo.ADDRESS)); phonefield.setText(info.getElement(StoreInfo.PHONE)); specialtyfield.setText(info.getElement(StoreInfo.SPECIALTY)); } } } }; static { store = PersistentStore.getPersistentObject(0xdec6a67096f833cL); synchronized (store) { if (store.getContents() == null) { store.setContents(new Vector()); store.commit(); } } _data = new Vector(); _data = (Vector) store.getContents(); } private static final class StoreInfo implements Persistable { private Vector _elements; public static final int NAME = 0; public static final int ADDRESS = 1; public static final int PHONE = 2; public static final int SPECIALTY = 3; public StoreInfo() { _elements = new Vector(4); for (int i = 0; i < _elements.capacity(); ++i) { _elements.addElement(new String("")); } } public String getElement(int id) { return (String) _elements.elementAt(id); } public void setElement(int id, String value) { _elements.setElementAt(value, id); } } }I put this code into two parts, the first part to record the second part to get info and the info, and they use the same class of StoreInfo, here is the code of the first part.
import net.rim.device.api.ui.*; import net.rim.device.api.ui.component.*; import net.rim.device.api.ui.container.*; import net.rim.device.api.system.*; import net.rim.device.api.util.*; import java.util.*; public class SaveMusicInfo extends UiApplication { private AutoTextEditField namefield; private AutoTextEditField addressfield; private EditField phonefield; private EditField specialtyfield; private static Vector _data; private static PersistentObject store; public static void main(String[] args) { SaveMusicInfo app = new SaveMusicInfo(); app.enterEventDispatcher(); } public SaveMusicInfo() { MainScreen mainScreen = new MainScreen(); mainScreen.setTitle(new LabelField("Favourite Music Store")); namefield = new AutoTextEditField("Store Name: ", ""); addressfield = new AutoTextEditField("Address: ", ""); phonefield = new EditField("Phone Number: ", "", Integer.MAX_VALUE, BasicEditField.FILTER_PHONE); specialtyfield = new EditField("Music Type: ", "", Integer.MAX_VALUE, BasicEditField.FILTER_DEFAULT); mainScreen.add(namefield); mainScreen.add(addressfield); mainScreen.add(phonefield); mainScreen.add(specialtyfield); mainScreen.addMenuItem(saveItem); mainScreen.addMenuItem(getItem); pushScreen(mainScreen); } private MenuItem saveItem = new MenuItem("Save", 110, 10) { public void run() { StoreInfo info = new StoreInfo(); info.setElement(StoreInfo.NAME, namefield.getText()); info.setElement(StoreInfo.ADDRESS, ddressfield.getText()); info.setElement(StoreInfo.PHONE, phonefield.getText()); info.setElement(StoreInfo.SPECIALTY, specialtyfield.getText()); _data.addElement(info); synchronized (store) { store.setContents(_data); store.commit(); } Dialog.inform("Success!"); namefield.setText(null); addressfield.setText(null); phonefield.setText(""); specialtyfield.setText(""); } }; static { store = PersistentStore.getPersistentObject(0xdec6a67096f833cL); synchronized (store) { if (store.getContents() == null) { store.setContents(new Vector()); store.commit(); } } _data = new Vector(); _data = (Vector) store.getContents(); } private static final class StoreInfo implements Persistable { private Vector _elements; public static final int NAME = 0; public static final int ADDRESS = 1; public static final int PHONE = 2; public static final int SPECIALTY = 3; public StoreInfo() { _elements = new Vector(4); for (int i = 0; i < _elements.capacity(); ++i) { _elements.addElement(new String("")); } } public String getElement(int id) { return (String) _elements.elementAt(id); } public void setElement(int id, String value) { _elements.setElementAt(value, id); } } }Following is the code of the second part.
import net.rim.device.api.ui.*; import net.rim.device.api.ui.component.*; import net.rim.device.api.ui.container.*; import net.rim.device.api.system.*; import net.rim.device.api.util.*; import java.util.*; public class GetMusicInfo extends UiApplication { private AutoTextEditField namefield; private AutoTextEditField addressfield; private EditField phonefield; private EditField specialtyfield; private static Vector _data; private static PersistentObject store; public static void main(String[] args) { GetMusicInfo app = new GetMusicinfo(); app.enterEventDispatcher(); } public GetMusicInfo() { MainScreen mainScreen = new MainScreen(); mainScreen.setTitle(new LabelField("Favourite Music Store")); namefield = new AutoTextEditField("Store Name: ", ""); addressfield = new AutoTextEditField("Address: ", ""); phonefield = new EditField("Phone Number: ", "", Integer.MAX_VALUE, BasicEditField.FILTER_PHONE); specialtyfield = new EditField("Music Type: ", "", Integer.MAX_VALUE, BasicEditField.FILTER_DEFAULT); mainScreen.add(namefield); mainScreen.add(addressfield); mainScreen.add(phonefield); mainScreen.add(specialtyfield); mainScreen.addMenuItem(saveItem); mainScreen.addMenuItem(getItem); pushScreen(mainScreen); } private MenuItem getItem = new MenuItem("Get", 110, 11) { public void run() { synchronized (store) { _data = (Vector) store.getContents(); if (!_data.isEmpty()) { StoreInfo info = (StoreInfo) _data.lastElement(); namefield.setText(info.getElement(StoreInfo.NAME)); addressfield.setText(info.getElement(StoreInfo.ADDRESS)); phonefield.setText(info.getElement(StoreInfo.PHONE)); specialtyfield.setText(info.getElement(StoreInfo.SPECIALTY)); } } } }; static { store = PersistentStore.getPersistentObject(0xdec6a67096f833cL); synchronized (store) { if (store.getContents() == null) { store.setContents(new Vector()); store.commit(); } } _data = new Vector(); _data = (Vector) store.getContents(); } private static final class StoreInfo implements Persistable { private Vector _elements; public static final int NAME = 0; public static final int ADDRESS = 1; public static final int PHONE = 2; public static final int SPECIALTY = 3; public StoreInfo() { _elements = new Vector(4); for (int i = 0; i < _elements.capacity(); ++i) { _elements.addElement(new String("")); } } public String getElement(int id) { return (String) _elements.elementAt(id); } public void setElement(int id, String value) { _elements.setElementAt(value, id); } } }I'm runing the Project One (first part) and record information to be stored, and then I WANT TO runing the project two (part two), but I received an error message telling me there are two same defined the class in the system, I try to change the class name of StoreInfo in two project, the last of error messge disappeared , instead of a CastClassException error, I am so sad...
For a long time debugging I found some interesting things, look at the below codes to two projects, please read the name of the StoreInfor class, not StoreInfo.
private MenuItem getItem = new MenuItem("Get", 110, 11) { public void run() { synchronized (store) { _data = (Vector) store.getContents(); if (!_data.isEmpty()) { StoreInfor info = (StoreInfor) _data.lastElement(); } } } };Now the _data class name is StoreInfo@xxxxxx (using _data.getClass () .getName ()) and class StoreInfo project two was renamed to StoreInfor, of course, I received a CastClassException error.
I finished the story, and I need some guys to help solve this problem, tks a lot! ~
Creating a descriptor application blackberry project and inside, choose library. Then, each project must refer to this library.
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Newbie question - NullPointerException in enterEventDispatcher
Hello
I'm new to the Blackberry development and use the 4.6 SDK Eclipse plugin. I used the sample applications as a basis and try to add 3 buttons to my main screen. It's code to the constructor of the main screen
public MyAppScreen() { super(DEFAULT_MENU | DEFAULT_CLOSE); try{ setTitle(new LabelField("My First App", LabelField.ELLIPSIS | LabelField.USE_ALL_WIDTH)); FieldChangeListener listener = new FieldChangeListener() { public void fieldChanged(Field field, int context) { Field buttonField = (Field) field; System.out.println("Button pressed: " + buttonField.getIndex()); } }; HorizontalFieldManager hfm = new HorizontalFieldManager( Manager.HORIZONTAL_SCROLL); ImageButton commBtn = new ImageButton(Field.FOCUSABLE, "img/comm_over.png", "img/comm.png"); commBtn.setChangeListener(listener); ImageButton accBtn = new ImageButton(Field.FOCUSABLE, "img/acts_over.png", "img/acts.png"); accBtn.setChangeListener(listener); ImageButton oppBtn = new ImageButton(Field.FOCUSABLE, "img/opp_over.png", "img/opp.png"); oppBtn.setChangeListener(listener); hfm.add(commBtn); hfm.add(new RichTextField(Field.NON_FOCUSABLE)); hfm.add(accBtn); hfm.add(new RichTextField(Field.NON_FOCUSABLE)); hfm.add(oppBtn); add(hfm); } catch(Exception e){ e.printStackTrace(); } }I call it in my UiApplication class as follows
public MyApp() { MyAppScreen homePage = new MyAppScreen(); pushScreen(homePage);}public static void main(String[] args) { MyApp app = new MyApp(); app.enterEventDispatcher();}ImageButton is a custom class whose code I made custom buttons sample application subject to change. When I run the application, I get a NullPointerException and stacktrace illustrates the exception in the MyAppScreen paint method.
Is someone can you please tell me what could be wrong with the application.
Thank you.
@mantaker, sorry, it was just a typo. Fix the code.
Thanks for all the answers. I solved the problem. Had missed on initialization in a constructor.
I feel really stupid
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Hey I hope you guys are all right, uh parsing xml using the analysis of sax, and I have a problem... the analysis done successfully, but when I started to show on the screen shows NullPointerException savings of the categories in the table
This is the code for the handler to
package startAPp; import java.util.Vector; import org.xml.sax.Attributes; import org.xml.sax.SAXException; import org.xml.sax.helpers.DefaultHandler; import Utils.NCRDecoder; public class XMLHandler extends DefaultHandler { StringBuffer sb; private CategoryBean category; private Vector categories = new Vector(); public void startDocument() throws SAXException { // TODO Auto-generated method stub super.startDocument(); } public void endDocument() throws SAXException { // TODO Auto-generated method stub categories.trimToSize(); CategoryBean[] beans = new CategoryBean[categories.size()]; categories.copyInto(beans); AppManger manger = new AppManger(); manger.setSize(categories.size()); manger.setCategories(beans); System.out.println("end Document"); } public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException { // TODO Auto-generated method stub sb = new StringBuffer(""); if (localName.equals("category")) { category = new CategoryBean(); } } public void endElement(String uri, String localName, String qName) throws SAXException { // TODO Auto-generated method stub if (localName.equalsIgnoreCase("title")) { category.setTitle(sb.toString()); System.out.println(" Name....." + sb.toString()); } else if (localName.equalsIgnoreCase("link")) { category.setLink(NCRDecoder.decode(sb.toString())); System.out.println(sb.toString()); } System.out.println("Local Name....." + localName); categories.addElement(category); sb = new StringBuffer(""); } public void characters(char[] ch, int start, int length) throws SAXException { String theString = new String(ch, start, length); sb.append(theString); } }and it's the Manger who save the table.
package startAPp; public class AppManger { CategoryBean[] beans; int size; public AppManger() { } public void setCategories(CategoryBean[] beans) { this.beans = beans; } public CategoryBean[] getCategories() { return beans; } public int getSize() { return size; } public void setSize(int size) { this.size = size; } }It is a sample of the screen to detect if the table contains null or not
AppManger app; CategoryBean[] beans; Connection _conn; Vector v; public MyScreen() { setTitle("MyTitle"); _conn = new Connection(); _conn.start(); } public void addElements() { app = new AppManger(); beans=new CategoryBean[app.getSize()]; v = new Vector(); add(new LabelField("start")); for (int i = 0; i < beans.length; i++) { add(new LabelField(i+"")); } }guys please help me
There seems to be a lot of LN(x) = inkage code missing in this example, you boot, you start a connection. But we do not know how this relates to your XML Manager or how your XMLHandler, which seems to have its own local variables, relates to the AppManger in your MyScreen. There are also problems of timing here - ideas actulaly wire complete before displaying MyScreen.
Wondering - how Java news are you?
In any case, the obvious error is illustrated by these two lines:
(a) in XMLHandler
Feeder AppManger = new AppManger();
(b) in MyScreen
p = new AppManger();
You see to think that they are the same object. They are of the same class, but that doesn't make them the same object. More specifically, they are two different instances of the same class. If you want that treatment on the day the same object, then they must share.
You can do this in
(1) sharing a t in reference to the same object (i.e. only create an AppManager object and pass it to the MyScreen and XMLHandler time) or
(2) to create a bot that Singleton Instance can access too.
In this case (2) is easier, and the best way to create a Singleton is to make it static (which as you will discover later does not actually a Singeton in all cases, but fact in this case).
Then change the beginning of AppManager as follows:
public class AppManger {}
CategoryBean beans [];
int size;static instance of AppManger;
private AppManger() {}
}
public static getInstance() {} AppManger
If (instance == null) {}
instance = new AppManger();}
return instance;
}
.....and then instead of use
... = new AppManager()
use
... = AppManager.getInstance ();
With that resolved, you have only the synchronization problem to worry, in other words, ensuring that you do not display data on MyScreen until you have downloaded. It is another problem.
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Problems to make my first application work
Hello, I am new in the development of blackberry applications, but not new in development (C++, C, c#, JAVA).
I am facing some problems with my first development for the blackberry in JAVA platform.
MyScreen code:
public final class MyScreen extends MainScreen { EncodedImage mImage = EncodedImage .getEncodedImageResource("icon.png"); ApplicationIcon mIcons = new ApplicationIcon(mImage); ApplicationIcon mIcon = mIcons; private static Date cDate; private String lefteds = ""; private LabelField leftd = new LabelField("Not set"); private TextBoxField tbf = new TextBoxField(200, 30); // private GridFieldManager grid = new GridFieldManager(3,3,1); //private VerticalFieldManager _manager; private LabelField Leftd2 = new LabelField("Not set"); private int Inum = -1; //----------------------------------------------- private static PersistentObject store = PersistentStore.getPersistentObject(0x1dfc10ec6454eb14L); public void saveUserInfo(){ synchronized(store) { store.setContents(leftd); store.commit(); } } public LabelField getlefted() { LabelField leftd; synchronized(store) { leftd = (LabelField)store.getContents(); if(leftd == null) { leftd = new LabelField("Not Set!"); } } return leftd; } //----------------------------------------------- MenuItem menuRegister = new MenuItem("Add status icon", 0, 0) { public void run() { registerIndicator(); }; }; MenuItem menuUnregister = new MenuItem("Remove status icon", 0, 0) { public void run() { unregisterIndicator(); }; }; protected void makeMenu(Menu menu, int instance) { super.makeMenu(menu, instance); menu.add(menuRegister); menu.add(menuUnregister); } private void registerIndicator() { try { ApplicationIndicatorRegistry reg = ApplicationIndicatorRegistry .getInstance(); ApplicationIndicator indicator = reg.register(mIcon, false, true); indicator.setVisible(true); } catch (Exception e) { } } private void unregisterIndicator() { try { ApplicationIndicatorRegistry reg = ApplicationIndicatorRegistry .getInstance(); reg.unregister(); } catch (Exception e) { } } void updateValue(int value) { try { ApplicationIndicatorRegistry reg = ApplicationIndicatorRegistry .getInstance(); ApplicationIndicator appIndicator = reg.getApplicationIndicator(); appIndicator.setValue(value); } catch (Exception e) { } } void updateIcon(ApplicationIcon icon) { try { ApplicationIndicatorRegistry reg = ApplicationIndicatorRegistry .getInstance(); ApplicationIndicator appIndicator = reg.getApplicationIndicator(); appIndicator.setIcon(icon); } catch (Exception e) { } } //-------------------------------------------------- public MyScreen() { try { this.Leftd2.setText(getlefted().getText()); } catch (Exception e) { } Background bg = BackgroundFactory.createSolidBackground(Color.LIGHTGRAY); setBackground(bg); XYEdges edges = new XYEdges(20, 20, 20, 20); Border border = BorderFactory.createBevelBorder(edges); // Set the displayed title of the screen setTitle("CountDown"); ButtonField b = new ButtonField("Set CountDown", ButtonField.CONSUME_CLICK); b.setChangeListener(customListener); add(b); this.tbf.setText("Days to go!"); add(Leftd2); add(this.tbf); if (this.Leftd2 == null) { saveUserInfo(); } } public void calculate() { Calendar c = Calendar.getInstance(TimeZone.getTimeZone("GMT")); c.setTime(new Date(System.currentTimeMillis())); //now Date currentdate = c.getTime(); int lefted = (int)((cDate.getTime() - currentdate.getTime()) / (1000 * 60 * 60 * 24)) + 1; lefteds = lefted + ""; leftd.setText(lefted + " " + this.tbf.getText()); Leftd2.setText(lefted + " " + this.tbf.getText()); saveUserInfo(); this.Inum = lefted; updateValue(lefted); } FieldChangeListener customListener = new FieldChangeListener() { public void fieldChanged(Field field, int context) { DateTimePicker datePicker = DateTimePicker.createInstance(); datePicker.doModal(); Calendar cal = datePicker.getDateTime(); Date date = cal.getTime(); MyScreen.cDate = date; calculate(); } }; }It's part * beep * ugly code and also, my application
There are some problems with it (apart from the fact that its badly coded, etc.).
Why is my device reboots as a minute after I launch my app (while the app completely closed)?
Is why I set the status bar would not appear as it should?
I hope that someone here would be able to help me, I'm sort of stuck... I must be trying to include to the top of my own for almoste time.
Thank you very much.
"I have being trying to understand by myself for almost an hour."
What - only an hour?
There is a little run before you can walk through this code, suggest a slightly lower rate.
Two things that I would look at first.
(1) but first reboot the device. I'm guessing that you have an older device and you compile using a more recent environment. Do not forget the applications being forward but not backward compatible, you should develop with a JDE older than the operating system on your device.
Allied to this I'll make sure your app is not started automatically.
(2) you seem to try to persist a LabelField:
public void saveUserInfo() {}
{Synchronized (Store)}
store.setContents (leftd);
Store.Commit ();
}
}
public getlefted() {} LabelField
LabelField leftd;
{Synchronized (Store)}
leftd = (LabelField) store.getContents ();
if(leftd == null) {}
leftd = new LabelField ("Not Set!");
}
}
Return leftd;
}To be persistent, an object must implement Persistable. LabelField doesn't do this. If you want to save a LabelField, what you save is the text (a string that is persistent) and recreate it.
See how you go after looking through this. But I recommend to start simple (just count) before adding things as indicators and persistentStore.
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NullPointerException in screen #navigationMovement Manager
Hello
After you add a VerticalFieldManager to a screen, Manager of navigationMovement super screen throws a NullPointerException and the verticalFieldManager scroll with the trackpad of this point (using the Enter key to scroll works very well and after once the trackpad works again scroll).
I use the same model as this post defining NullField focus on the top and the bottom of the field with vertical scrolling. Has anyone have the same problems, or have any ideas on places of interest to search for?
I'm sorry, that I couldn't reproduce it with a simple example. After a few hours, I was able to solve the problem by changing the hierarchy of my screen area, adding a handler of accepting high-field the developed anything in it.
I think what he throwed NullPointerException because he could not find a field of focus when took place the first movement of the navigation, or the system has attempted to lock the focus on an element unfocusable. I have no final conclusion, I could work around it by rearranging the fields.
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So I try to get a storage for an options screen, but apparently my method of doing this just won't work right. whenever I try to access a variable of the OptionsScreen, it is null, unless I opened the screen Options atleast once. Now, I tried to create a new instance of the OptionsScreen to see if it works... but it didn't.
The application starts on the main menu, then the next screen is screen2. You can open the Options of screen2 screen. The only way to prevent a NullPointerException is now opening the OptionsScreen atleast once
I put three categories below to view the corresponding code.
public class theApplication extends UiApplication { public static OptionsScreen options; public theApplication() { pushScreen(new MainMenu()); } public static void main(String[] Args) { // Create a new instance of the sample application theApplication theApp = new theApplication(); // Add this app to the event dispatcher theApp.enterEventDispatcher(); // Create new options screen, to attempt to // load all options from persistent store options = new OptionsScreen(); } }final public class OptionsScreen extends MainScreen { private static PersistentObject options; /** This is the key that allows access to the settings. */ private static long optionsKey = 0x6514f426119fc864L; private static BasicEditField text; public OptionsScreen() { // Set the title setTitle("Options"); options = PersistentStore.getPersistentObject(optionsKey); setupUI(); } protected void setupUI() { retrieveData(); add(text); } private static boolean storeData() { Options newOptions = new Options(); try { synchronized(options) { newOptions.setText(text.getText()); options.setContents(newOptions); options.commit(); return true; } } catch(Exception e) { Dialog.alert("error!"); return false; } } private static void retrieveData() { Options theOptions = new Options(); try { synchronized(options) { theOptions = (Options)options.getContents(); try { text = new BasicEditField("text ", theOptions.getText());} catch(Exception e) { text = new BasicEditField("text ", ""); } } } } public void save() throws IOException { storeData(); super.save(); } }public class Options implements Persistable { private String text; public void setText(String newText) { text = newText;} public String getText() {return text}; }I have your OptionScreen class, do not use the bt constructor to initialize your data:
static { options = PersistentStore.getPersistentObject(optionsKey); }I encourage you to use the Singleton patern
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what the? (ChoiceField) .getChoiceCached (int) online: 898 NullPointerException
Why I get this error? (ChoiceField) .getChoiceCached (int) online: 898 NullPointerException
The ChoiceFeild object is not null.
JDE 5.0, 1.6.latest, Windows XP pro 32-bit jdk 1.3.0 eclipse plugin
The exception gives no message.
Just found the bug, here's the code.
Sort = new InData [X]; Suppose X 4 >
Type [0] =...sort [1] =...
Sort [2] =...
Sort [3] =...
That is the problem - the sorting matrix is defined over a length of X but is filled less of X items
sortChoice = new TransparentObjectChoiceField ("", sort, 0, Field.FIELD_VCENTER, orig) {}
{} public void paint (Graphics graphics)
graphics.setColor (menuTextColor);
Super.Paint (Graphics);
}
};It was hard to find because the exception was thrown only when the screen with the sortChoice object was pushed and then of course there were several of these objects on the screen so it is difficult to see who wants to go.
Thank you.
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