merge multiple files with JAXB - java

It's the first time I'm using stackoverflow and I don't speak English perfectly so be nice please.
I'm using Jaxb in append mode like that
for (Document330 document : documents){
JAXBContext jContext = JAXBContext.newInstance(Document330Xml.class);
Marshaller m = jContext.createMarshaller();
m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
m.marshal(document, fos);
}
And I have an output file like that:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<DOCUMENT>
<MAILING>
<REF>M584</REF>
<LIBELLE>Mail Test 1</LIBELLE>
</MAILING>
</DOCUMENT>
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<DOCUMENT>
<MAILING>
<REF>M585</REF>
<LIBELLE>Mail Test 2</LIBELLE>
</MAILING>
</DOCUMENT>
but I want something like that :
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<DOCUMENTS>
<DOCUMENT>
<MAILING>
<REF>M584</REF>
<LIBELLE>Mail Test 1</LIBELLE>
</MAILING>
</DOCUMENT>
<DOCUMENT>
<MAILING>
<REF>M585</REF>
<LIBELLE>Mail Test 2</LIBELLE>
</MAILING>
</DOCUMENT>
</DOCUMENTS>
But it is possible that I have many XML. So I do not think the Unmarshaller is the best solution
Thanks for reading me


If I remind correctly, you need to create a Documents330Xml class, which can be marshalled (you can have a look at your Document330Xml class for reference). This class needs a list of Document330Xml as field.
If you then marshall the Documents330Xml class, you should get the desired XML.

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========
<?xml version="1.0" encoding="UTF-8"?>
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<doc>{doc/Header, for $i in 1 to 100000 return doc/Transaction, doc/Footer}</doc>
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