[jdom-interest] BUG in Document

[steven.gould at cgiusa.com]

Frank Morton wrote:

> > Frank Morton wrote:
> >
> > > I'm a newbie (today), but really like what I see so far and will
> > > be happy to contribute significantly. I'm using code freshly
> > > checked out of CVS.
> > >
> > > If you do:
> > >
> > > Document doc = new Document();
> > > doc.setRootElement(new Element("something"));
> > >
> > > You get a NullPointerException because "content" is
> > > not initialized when using the no arg constructor.
> >
> > Why not use the following:
> >
> > Document doc = new Document( new Element("something") );
> >
> > Won't this give you the intended result?
> >
> > > So, I added the following to the first line of setRootElement(element):
> > >
> > > if(content == null) content = new LinkedList();
> > >
> > > Since I'm new to the code, don't know if this is the best way to
> > > do this. So, what is the process of bug fixing?
> > >
> > > Just to head this off, I need to be able to do it this way because
> > > I'm writing a class that extends Document, so it needs to construct
> > > the Document before it has a chance to create what is going to
> > > be the root element.
>
> What I am doing is creating a class that (among other things)
> sets the root element as part of the constructor like:
>
> public class Key extends Document {
>      public Key() {
>           super();
>           setRootElement(new Element("key"));
>      }
> }
>
> I wish I could do in the constructor:
>
>      super(new Element("key"));
>
> But, you can't do that.

Why not? It worked fine for me. Just to be clear, here's my code. Is this what
you were trying to do?

>>>
import org.jdom.Document;
import org.jdom.Element;

public class Key extends Document
{
    public Key()
    {
     super(new Element("key"));   //works fine
    }

    public static void main( String[] args )
    {
     Key k = new Key();
    }
}
<<<

> Anyway, we're getting away from the point.
>
> You should be able to set the root element after using the default
> constructor when you are extending the class and I've provided
> a bug fix, but am new enough that I don't know how to get the
> bug fix integrated into the base code.
>
> Frank