ClassCastException with Document

Question

I have an abstract class implements DOM Document.
public abstract class XDataDoc implements Document {
I get ClassCastException when I try to parse and XML.
public XDataDoc xDataDoc ;
factory = DocumentBuilderFactory.newInstance();
parser = factory.newDocumentBuilder();
xDataDoc = parser.parse("http://url");
I have the same problem also with the classes implements Node or NodeList. I need this custom Document to use as a data source.
What am I doing wrong? Is there a better way than creating a class implements Document? (Shall I create an interface extends?)
Any help about extends / implements abstract classes and interfaces will be great useful. (I am still a newbie as you will understand)
Thanks in advance.

Answer 1

I have to prepare too many screens for data entry in a
web application.
I have an Oracle 8i database and servlets creating xml
from database and receiving xml to write to database.
Xml created with servlets have all similar schema as
master row and detail rows as childnode of master.
Idea is to create also custom swing objects (such as
JTextField, JcomboBox, Jlist etc) that can work bound
to DOM document. So creating screens will be easy as
easy as placing swing objects on layout.
I forget to mention also that gives the same
exception:
xDataDoc = (XDataDoc) parser.parse("http://url");
Those requirements you describe have nothing to do with your problem, though, and I don't see where they require you to implement Document. In fact you can't implement Document because the parser has already done it for you. Your code needs to look like this:
Document xDataDoc = parser.parse("http://url");