exception in creating xml file using xml outputter

Question

here is my simple code:

try
                {
                    Element performances = new Element("performances");
                    Document doc = new Document(performances);
                    doc.setRootElement(performances);

                    performances.setAttribute(new Attribute("date", dateFormat.format(cal.getTime())));

                    Element uptime = new Element("uptime");
                    uptime.addContent(new Element("days").setText(new Long(duptime).toString()));
                    uptime.addContent(new Element("hours").setText(new Long(huptime).toString()));
                    uptime.addContent(new Element("minutes").setText(new Long(muptime).toString()));
                    uptime.addContent(new Element("seconds").setText(new Long(suptime).toString()));

                    doc.getRootElement().addContent(uptime);

                    XMLOutputter xmlOutput = new XMLOutputter();

                    xmlOutput.setFormat(Format.getPrettyFormat());
                    xmlOutput.output(doc, new FileWriter("/homa/mazzy/Scrivania/perfor_"+dateFormat.format(cal.getTime())+"xml"));

I got this exception

Exception in thread "AWT-EventQueue-0" org.jdom2.IllegalAddException: The element "performances" could not be added as the root of the document: The Content already has an existing parent document

but I don't know what does it means.where is the mistake?

this kind of exceptions raised if you trying to add second root element into exicted dom tree. — Dmitry Zagorulkin
– Dmitry Zagorulkin, Commented Jul 12, 2012 at 9:53

user647772 · Accepted Answer · 2012-07-12 09:36:26Z

1

These two lines

Document doc = new Document(performances);
doc.setRootElement(performances);

cause the error. The first sets the root, the second dies it again.

Edit

Do

Document doc = new Document()
doc.setRootElement(performances)

or

Document doc = new Document(performances)

answered Jul 12, 2012 at 9:36

user647772

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2 Comments

user1508419 Over a year ago

so the two lines are the same?

user647772 Over a year ago

see jdom.org/docs/apidocs/org/jdom2/… and jdom.org/docs/apidocs/org/jdom2/…

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