The problem is that your root element now belongs to two different
Docuements. To make this work your way, you need to clone the root
element, like this...
Element root = (Element) test.getRootElement().clone();
But, there is an easier way to replicate a Document...
Document newDocument = (Document) test.clone();
-----Original Message-----
From: jdom-interest-bounces@(protected)
[mailto:jdom-interest-bounces@(protected)
robert.w2.phillips@(protected)
Sent: Thursday, July 28, 2005 2:23 PM
To: jdom-interest@(protected)
Subject: [jdom-interest] Creating new XML documents from existing
XMLdocument(s)
Hello,
I am trying to create a new XML document from an existing XML document
using JDOM, but am unable to do so. I want to take the root element of
an existing document and use it as the root element of a new XML
document. The code I am using is as follows:
--------------------------------
import org.jdom.*;
import org.jdom.input.*;
import org.jdom.output.*;
import org.jdom.transform.*;
import
java.io.StringReader;
public class JDOMTest
{
public static void main(String[] args) throws JDOMException {
mytest();
}
public static void mytest() {
try {
// XML String. Elements from this will form the basis of the
new XML document
String xmlString="<?xml version=\"1.0\"
encoding=\"UTF-8\"?><note><to>Tove</to><from>Jani</from><heading>Reminde
r</heading><body>Don't forget me this weekend!</body></note>";
SAXBuilder builder = new SAXBuilder();
// Extract the root element from the XML string
Document test = builder.build(new StringReader(xmlString));
Element root = test.getRootElement();
// Create a new XML document and set its root element
Document newDocument = new Document();
newDocument.setRootElement(root);
System.out.println("Complete!");
}
catch (Exception e) {
System.out.println("General Exception ocurred : "+e);
}
}
}
------------------------------
This compiles without error, but every time I run it I get the following
error:
------------------------------
> java JDOMTest
General Exception ocurred :
org.jdom.IllegalAddException: The element
"note" could not be added as the root of the document: The Content
already has an existing parent document
------------------------------
Why will this not work? The problem occurs because I am trying to create
two "
org.jdom.Document" objects, but this works in pre 1.0 JDOM
libraries. Is there is a restriction on the number of Document objects I
can create, or have I missed something obvious?
I have tried compiling it and running it on two different systems with
two different version of Java, but both give the same result. On Windows
XP SP2 I am using:
------------------------------
java version "1.4.2_06"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_06-b03)
Java HotSpot(TM) Client VM (build 1.4.2_06-b03, mixed mode)
------------------------------
On UNIX, I am using:
------------------------------
java version "1.4.1_03"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1_03-b02)
Java HotSpot(TM) Client VM (build 1.4.1_03-b02, mixed mode)
------------------------------
I built the JDOM.JAR library from the latest download available off the
website (1.0). As I mentioned, older (pre-1.0 release) JDOM.JAR
libraries work OK.
Any help you can offer would be most appreciated.
Best regards,
Rob.
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