How to force java xml dom to produce newline after <?xml version="1.0" encoding="UTF-8"?>?

Question

I use this code to enable newlines:

    transformer.setOutputProperty(OutputKeys.INDENT, "yes");
    transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");

But I get following output:

<?xml version="1.0" encoding="UTF-8"?><root>
  <child>aaaa</child>
</root>

I'd like to have newline before root element. What should I do?

Answer 1

Other answers did not work for me, or would be unacceptable in my application. This worked for me:

transformer.setOutputProperty(OutputKeys.STANDALONE, "yes");

Answer 2

Another solution is : transformer.setOutputProperty(OutputKeys.INDENT, "yes"); transformer.setOutputProperty(OutputKeys.DOCTYPE_PUBLIC,"yes"); transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "10");