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Create an XML document in memory using createDocument(null, null, null) throws error

I am creating an XML document in memory. When it gets to the following code:

                        DOMImplementation impl = builder.getDOMImplementation();

                        // create the root element
                        org.w3c.dom.Document doc = impl.createDocument(null, null, null);

it throws the following error:
org.w3c.dom.DOMException: INVALID_CHARACTER_ERR: An invalid or illegal XML character is specified.

I have looked on the net and apparently there is an issue with passing null, null, null - for example here:

http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4913260

However, it doesn't say how to correct the issue. Any help please? :-)

Weiping Du

The second parameter, qualified name of the document element, is NOT allowed to be 'null'

SOLUTION

Mayank S

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PurpleSlade

ASKER

Hmmm, I got the example from here which used null parameters:

http://www.rgagnon.com/javadetails/java-0530.html

What exactly does "qualified name of the document element to be created" mean?

CEHJ

Document doc = DocumentBuilder.newDocument();

Mayank S

Thus spake the HexaGenius ;-)

Weiping Du

>>> Hmmm, I got the example from here which used null parameters:
It depends on what version xerces.jar you are using. The one you are using is supposed like this one:
org.apache.xerces.dom.DOMImplementationImpl.createDocument() ->
public Document createDocument(String s, String s1, DocumentType documenttype)
throws DOMException
{
if(documenttype != null && documenttype.getOwnerDocument() != null)
{
throw new DOMException((short)4, "DOM005 Wrong document");
} else
{
DocumentImpl documentimpl = new DocumentImpl(documenttype);
org.w3c.dom.Element element = documentimpl.createElementNS(s, s1);
documentimpl.appendChild(element);
return documentimpl;
}
}

Then, org.apache.xerces.dom.CoreDocumentImpl.createElementNS() ->
public Element createElementNS(String s, String s1)
throws DOMException
{
if(errorChecking && !isXMLName(s1))
throw new DOMException((short)5, "DOM002 Illegal character");
else
return new ElementNSImpl(this, s, s1);
}

Then:
public static boolean isXMLName(String s)
{
if(s == null)
return false;
else
return XMLCharacterProperties.validName(s);
}

ASKER CERTIFIED SOLUTION

CEHJ

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Mayank S

Correctly spake considering DocumentBuilder represented its instance ;-)

CEHJ

;-)

Weiping Du

You can try this:
DOMImplementation impl = builder.getDOMImplementation();
org.w3c.dom.Document doc = impl.createDocument(null, "XMLRoot", null);

NodeList children = doc.getElementsByTagName("XMLRoot");
System.out.println("Initialized" + children.getLength());

Weiping Du

What exactly does "qualified name of the document element to be created" mean?
- you XML document Root element name

PurpleSlade

ASKER

owenli27 - how do you get a handle to the root node once it's been created through that parameter? Is there something like Element root = doc.getRootElement() or the like?

CEHJ - your amended solution compiles fine and there are no more errors - it's probably what I will end up using since it is pretty clean.

mayankeagle - I haven't tried your solution but I am assuming it also works.

SOLUTION

Weiping Du

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PurpleSlade

ASKER

OK - that works as well. So, 3 working solutions ... now the point divvying. Thanks everyone for your help!

CEHJ

:-)

PurpleSlade

ASKER

Hm - I probably should have put owenli27's solution as the accepted since he answered the specific question I had about the method that didn't work ... if you want owenli27 I can try and have that changed, otherwise I will leave it. Let me know. My apologies, for some reason I thought that they would all show as "Assisted" solutions. The new format had me confused since it doesn't explicity state that I was accepting one particular solution.

Weiping Du

It really doesn't matter and you can just leave it.
Thanks for rewards.

Mayank S

>> I haven't tried your solution but I am assuming it also works.

Yes it does :)