how to disable dtd at runtime in java's xpath?

I got dtd in file and I cant remove it. When i try to parse it in Java I get "Caused by: Network is unreachable: connect", because its remote dtd. can I disable somehow dtd checking?

Asked by: Connie560 | Posted: 28-01-2022

Answer 1

You should be able to specify your own EntityResolver, or use specific features of your parser? See here for some approaches.

A more complete example:

<?xml version="1.0"?>
<!DOCTYPE foo PUBLIC "//FOO//" "foo.dtd">

And xpath usage:


import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathFactory;

import org.w3c.dom.Document;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

public class Main {

    public static void main(String[] args) throws Exception {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();

        builder.setEntityResolver(new EntityResolver() {

            public InputSource resolveEntity(String publicId, String systemId)
                    throws SAXException, IOException {
                System.out.println("Ignoring " + publicId + ", " + systemId);
                return new InputSource(new StringReader(""));
        Document document = builder.parse(new File("src/foo.xml"));
        XPathFactory xpathFactory = XPathFactory.newInstance();
        XPath xpath = xpathFactory.newXPath();
        String content = xpath.evaluate("/foo/bar/text()", document

Hope this helps...

Answered by: Freddie129 | Posted: 01-03-2022

Answer 2

This worked for me:

 SAXParserFactory saxfac = SAXParserFactory.newInstance();
  try {
    saxfac.setFeature("", false);
    saxfac.setFeature("", false);
    saxfac.setFeature("", false);
    saxfac.setFeature("", false);
    saxfac.setFeature("", false);
  catch (Exception e1) {

Answered by: Haris405 | Posted: 01-03-2022

Answer 3

I had this problem before. I solved it by downloading and storing a local copy of the DTD and then validating against the local copy. You need to edit the XML file to point to the local copy.

<!DOCTYPE root-element SYSTEM "filename">

Little more info here:

I think you can also manually set some sort of validateOnParse property to "false" in your parser. Depends on what library you're using to parse the XML.

More info here:

Answered by: Steven114 | Posted: 01-03-2022

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