Problem

Assume that we have a "person" variable returned from calling Ti.Contacts.showContacts({ selectedPerson: ... }) call. If you do something to turn person.email.work into a string such as 'Work: ' + person.email.work, the "Cannot find default value for object" error is displayed.

Kroll attempts to access person.email.home, which is an ArrayList (ref: https://github.com/appcelerator/titanium_mobile/blob/master/android/modules/contacts/src/ti/modules/titanium/contacts/PersonProxy.java#L69"> PersonProxy.java#69). It doesn't know how to turn this into a string, so the error is displayed.

Solution

The real problem here is that we get a very obtuse error message when you try to do something common (print out a variable for debugging purposes). If we could receive an actual array from person.email.home, it could be stringified into its values, and this problem would be avoided entirely.

Sample Code

var win = Titanium.UI.createWindow({
    backgroundColor:'#fff'
});

var label = Ti.UI.createLabel({
    top: 0, right: 0, bottom: 70, left: 0,
    text: 'Pick Someone With a "Home" Email, and you should receive an error message "Cannot find default value for object".'
});
win.add(label);

var button = Ti.UI.createButton({
    title: 'Show Contacts',
    bottom: 20,
    width: 200,
    height: 40
});
button.addEventListener('click', function() {
    Titanium.Contacts.showContacts({
        selectedPerson: function(e) {
            alert(String(e.person.email.home)); // this will throw the "cannot find default value for object" error
            // and the .length call below will have problems if the person doesn't have any home email addresses
            for (var i = 0, l = e.person.email.home.length; i < l; i++) {
                alert(i + ': ' + e.person.email.home[i]);
            }
        }
    });
});
win.add(button);

win.open();

Steps to Reproduce

1. Drop the above into an app.js
   
2. Launch it and touch the "Show Contacts" button.
   
3. Pick someone who has an email address with the "Home" type
   
4. You'll see the error

Trace Level Log

I/ActivityManager( 2456): Displayed activity com.android.contacts/.ContactsListActivity: 779 ms (total 779 ms)
V/WindowManager( 2456): Dsptch > Window{4823c0f8 com.android.contacts/com.android.contacts.ContactsListActivity paused=false}
V/InputDevice( 2456): ID[0]=0(0) Dn(0=>1)
V/WindowManager( 2456): Dsptch > Window{4823c0f8 com.android.contacts/com.android.contacts.ContactsListActivity paused=false}
V/InputDevice( 2456): ID[0]=0(0) Up(1=>0)
I/ContactsListActivity(24230): uri is content://com.android.contacts/contacts/lookup/3521i25c61c248f9cab48.1998r770-2C2C4E484652484E52484E34424248/529
D/ContactsListActivity(24230): onPause------------------------------------------
I/TiRootActivity(21253): (main) [0,0] checkpoint, on root activity resume. context = org.appcelerator.titanium.TiContext@47cf94c0
E/KrollCallback(21253): (kroll$1: app://app.js) [111,111] ECMA Error evaluating source, invocation: [callMethod (anonymous) org.appcelerator.titanium.kroll.KrollCallback@47caeb98], message: TypeError: Cannot find default value for object. (file:///android_asset/Resources/app.js#19)
E/KrollCallback(21253): org.mozilla.javascript.EcmaError: TypeError: Cannot find default value for object. (file:///android_asset/Resources/app.js#19)
E/KrollCallback(21253):     at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3761)
E/KrollCallback(21253):     at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3739)
E/KrollCallback(21253):     at org.mozilla.javascript.ScriptRuntime.typeError(ScriptRuntime.java:3767)
E/KrollCallback(21253):     at org.mozilla.javascript.ScriptRuntime.typeError1(ScriptRuntime.java:3779)
E/KrollCallback(21253):     at org.mozilla.javascript.ScriptableObject.getDefaultValue(ScriptableObject.java:839)
E/KrollCallback(21253):     at org.mozilla.javascript.ScriptableObject.getDefaultValue(ScriptableObject.java:758)
E/KrollCallback(21253):     at org.mozilla.javascript.NativeArray.getDefaultValue(NativeArray.java:522)
E/KrollCallback(21253):     at org.mozilla.javascript.ScriptRuntime.toString(ScriptRuntime.java:790)
E/KrollCallback(21253):     at org.mozilla.javascript.NativeString.execIdCall(NativeString.java:259)
E/KrollCallback(21253):     at org.mozilla.javascript.IdFunctionObject.call(IdFunctionObject.java:129)
E/KrollCallback(21253):     at org.mozilla.javascript.Interpreter.interpretLoop(Interpreter.java:1711)
E/KrollCallback(21253):     at script(file:///android_asset/Resources/app.js:19)
E/KrollCallback(21253):     at org.mozilla.javascript.Interpreter.interpret(Interpreter.java:854)
E/KrollCallback(21253):     at org.mozilla.javascript.InterpretedFunction.call(InterpretedFunction.java:164)
E/KrollCallback(21253):     at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:426)
E/KrollCallback(21253):     at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3161)
E/KrollCallback(21253):     at org.mozilla.javascript.InterpretedFunction.call(InterpretedFunction.java:162)
E/KrollCallback(21253):     at org.appcelerator.titanium.kroll.KrollCallback.callSync(KrollCallback.java:139)
E/KrollCallback(21253):     at org.appcelerator.titanium.kroll.KrollCallback$1.run(KrollCallback.java:164)
E/KrollCallback(21253):     at android.os.Handler.handleCallback(Handler.java:587)
E/KrollCallback(21253):     at android.os.Handler.dispatchMessage(Handler.java:92)
E/KrollCallback(21253):     at android.os.Looper.loop(Looper.java:123)
E/KrollCallback(21253):     at org.appcelerator.titanium.kroll.KrollHandlerThread.run(KrollHandlerThread.java:89)
E/TiJSError(21253): (kroll$1: app://app.js) [4,115] ----- Titanium Javascript Runtime Error -----
E/TiJSError(21253): (kroll$1: app://app.js) [1,116] - In file:///android_asset/Resources/app.js:19,0
E/TiJSError(21253): (kroll$1: app://app.js) [0,116] - Message: TypeError: Cannot find default value for object. (file:///android_asset/Resources/app.js#19)
E/TiJSError(21253): (kroll$1: app://app.js) [0,116] - Source: null

Tested On

Titanium SDK version: 1.6.0 (02/23/11 12:34 9882e81)
Titanium SDK version: 1.7.0 (03/03/11 10:45 87a2113...)
BROKEN on Android Emulator 2.2 APIs
BROKEN on Android Device Epic 4G 2.2

Associated Helpdesk Ticket

http://developer.appcelerator.com/helpdesk/view/76227">http://developer.appcelerator.com/helpdesk/view/76227