lwuit.io.Storage clears after closing application

Question

I'm trying to use lwuit.io.Storage, it works fine while application is running (I can do crud) but it's data clears after closing the application. I've considered:

registering my class with "Util.register("Car", Car.class);" in "initVars()" method;
implementing "Externalizable" interface in "Car" class. // "getObjectId()" method returns "Car"
calling "Storage.init("myProjectName");" in MainMIDlet class
checking to make sure Storage is initialized properly with "Storage.isInitialized()" in MainMIDlet class

I'm storing my "car" objects with a Vector, using:

Car c = new Car("ford", 1918);

Vector v = (Vector) Storage.getInstance().readObject("cars");
if (v == null) {
    v = new Vector();
}
v.addElement(c);
Storage.getInstance().writeObject("cars", v);

Vector test = (Vector) Storage.getInstance().readObject("cars");
if (test.lastElement() instanceof Car){
   Car c1 = (Car) test.lastElement();
   System.err.println(c1);
}

avoiding call "Storage.getInstance().clearStorage();" anywhere in the code!
"Storage.getInstance().listEntries();" returns one element array containing "cars" String (even after restarting application).

this is my simple "car" class.

any idea what I'm missing / doing wrong here?

thanks in advance

I tried to test with a "String" instead of "Vector", it worked fine. the string preserved in the Storage after closing the app. — Ali Ghanavatian, Mar 05 '12 at 17:32

score 2 · Accepted Answer · answered Mar 06 '12 at 08:06

I got it, that was a stupid mistake,

The problem was in implementing Externalizable inteface, I was calling "Util.writeUTF(name);" in externalize() method, and trying to read it with "stream.readUTF()" in internalize method.

simply replaced "Util.writeUTF(name)" with "stream.writeUTF(name)".

and it worked out.

lwuit.io.Storage clears after closing application

1 Answers1