[jdom-interest] JDOM Error

[Laurent Bihanic]

A JDOM Element can be associated with one and only one parent (Element or 
Document).
As you put the "Document doc = new Document(root);" statement inside the first 
level loop, you attempt to attach the Fibonacci_Numbers element to many documents.

I guess you should close both loops before creating & outputting the document.
Othewise, call root.detach() before creating the new document.

Laurent


shekher thakur a écrit :
> Hi all,
>  
> i am using JDOM for creating XML and below is a sample code i have 
> written to create  XML.i am a beginer in the XML+JDOM
>  
> *
> 
> public
> 
> * *class* FibonacciJDOM {
> 
> *public* *static* *void* main(String[] args) {
> 
> Element root =
> 
> *new* Element("Fibonacci_Numbers");
> 
> BigInteger low = BigInteger.
> 
> /ONE/;
> 
> BigInteger high = BigInteger.
> 
> /ONE/;
> 
> *for*(*int* j=1; j<=11; j++){
> 
> *for* (*int* i = j; i <= 2; i++) {
> 
> Element fibonacci =
> 
> *new* Element("fibonacci"+j);
> 
> fibonacci.setAttribute(
> 
> "index", String./valueOf/(i));
> 
> fibonacci.setText(low.toString());
> 
> root.addContent(fibonacci);
> 
> BigInteger temp = high;
> 
> high = high.add(low);
> 
> low = temp;
> 
> }
> 
> Document doc =
> 
> *new* Document(root);
> 
> // serialize it onto System.out
> 
> *try* {
> 
> XMLOutputter serializer =
> 
> *new* XMLOutputter();
> 
> FileWriter writer =
> 
> *new* FileWriter("c:/myFile.xml");
> 
> serializer.output(doc, writer);
> 
> writer.close();
> 
> }
> 
> *catch* (IOException e) {
> 
> System.
> 
> /err/.println(e);
> 
> }
> 
> }
> 
> }
> 
> }
> 
>  
> 
> But when i run my example i get the follwing error
> 
>  
> 
> Exception in thread "main"
> 
> _org.jdom.IllegalAddException_: The element "Fibonacci_Numbers" could 
> not be added as the root of the document: The Content already has an 
> existing parent document
> 
> at org.jdom.ContentList.add(
> 
> _ContentList.java:205_)
> 
> at org.jdom.ContentList.add(
> 
> _ContentList.java:131_)
> 
> at java.util.AbstractList.add(
> 
> _AbstractList.java:91_)
> 
> at org.jdom.Document.setRootElement(
> 
> _Document.java:236_)
> 
> at org.jdom.Document.<init>(
> 
> _Document.java:117_)
> 
> at org.jdom.Document.<init>(
> 
> _Document.java:154_)
> 
> at test.FibonacciJDOM.main(
> 
> _FibonacciJDOM.java:31_)
> 
>  
> 
> i am unable to find out the problem what is causing this.
> 
>  
> 
> any suggestion in this regard will be much helpful.
> 
>  
> 
> Thanks in advaive
> 
> Shekher