How do I solve the NonPersistableObjectException

I have a method that is simple, written in the form:

Public Shared Sub set (long uniqueId, String value) {}
Store = PersistentStore.getPersistentObject (uniqueId);
synchronized (store) {}
store.setContents (value);
Store.Commit ();
}
}

This method works very well for the first time, but the second time, it will fail with NonPersistableObjectException.

Point to be noted is that same unique identification number, I'm updating with the same value.

You have created an object that extends the string that you store?  If so, you will need to implement Persistable in this object.

Your own object is also a good idea.  But there is a problem with persistent objects when you upgrade the.  Say, you create an object as follows:

class MyPersistentObject extends Persistable {}

String _string1 = null;

String _string2 = null;

....

String getString1() {}

Return _string1;

}

...

}

Now for V2, you want to add another string, so you must

class MyPersistentObject extends Persistable {}

String _string1 = null;

String _string2 = null;

String _string3 = null;

....

String getString3() {}

Return _string3;

}

...

}

Now because you have changed the structure of this persistent object, you actually have the persistent class on the incompatible device with your upgrade.  To install, users will have to delete the old application, lose the stored data.

However if you did to begin with:

class myPersistedObject extends IntHashTable implements Persistable {}

...

String getString1() {}

Return this.get (1);

}

....

}

Then to add another channel, you simply add the get method:

class myPersistedObject extends IntHashTable implements Persistable {}

...

String getString3() {}

Return this.get (3);

}

....

}

The structure does not change and it is compatible.

The above code is NOT correct, I hope you get the idea.

Then create your own class, but extends a Collection object and you get the flexibility and scalability.

Hope it makes sense.

Tags: BlackBerry Developers

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