java XMLUtils.outputDOM output is empty

Question

Cant figure out why XMLUtils.outputDOM is not outputing anything

import org.apache.xml.security.utils.XMLUtils;

DocumentBuilderFactory dbf= DocumentBuilderFactory.newInstance();
dbf.setNamespaceAware(true);
InputSource is = new InputSource(new StringReader("<EDoc></EDoc>"));
Document doc = dbf.newDocumentBuilder().parse(is);
Element root = doc.getDocumentElement();
System.out.println(root);
OutputStream os = new FileOutputStream("out_xs.xml");
XMLUtils.outputDOM(root, os, true);
System.out.println(XMLUtils.getFullTextChildrenFromElement(root));

Output is:

[EDoc: null]
(empty string)

out_xs.xml:

<?xml version="1.0" encoding="UTF-8"?>

I can get the root element OK, but file is generated with xml definition only as true is provided. What is going on? I am using same function in other place where it works after library uses Document, so I suspect Document should be notified to commit changes? Cant find any information using search

I'm confused. Your question seems to be about the out_xs.xml file not getting XML, but you don't show us what is actually in the file. Instead you show us that getFullTextChildrenFromElement(root) returns an empty string, which has nothing whatsoever to do with outputDOM(root, os, true), and blank output is expected, since there are no text nodes in the XML, so not sure why that code is even there, except it is confusing the issue. Please clean up the question, to clarify it. — Andreas
– Andreas, Commented Sep 26, 2019 at 6:55

Ambro-r · Accepted Answer · 2019-09-26 08:04:04Z

You question is a bit confusing / unclear. I ran the code provided and the xml file generated "out_xs.xml" contains the following...

<?xml version="1.0" encoding="UTF-8"?>
<EDoc></EDoc>

... which is correct according to the code block you've specified.

I did have to make a slight change to your code though, had to add the line Init.init(); just above XMLUtils.outputDOM(root, os, true);. Otherwise I kept getting the exception org.apache.xml.security.c14n.InvalidCanonicalizerException: You must initialize the xml-security library correctly before you use it

Maybe check your dependency versions, I used the following in Gradle:

// https://mvnrepository.com/artifact/xml-security/xmlsec
compile group: 'xml-security', name: 'xmlsec', version: '1.3.0'

// https://mvnrepository.com/artifact/commons-logging/commons-logging
compile group: 'commons-logging', name: 'commons-logging', version: '1.1.1'

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