How to disable DTD fetching using JAXB2.0

I'm trying to use JAXB to unmashall some XML which I used xjc to create in the first place. I don't want to do any validation on the unmarshalling, but even though I have disabled the validation according to the JAXB documentation with u.setSchema(null);, but this hasn't prevented a FileNotFoundException being thrown when it tries to run and can't find the schema.

JAXBContext jc = JAXBContext.newInstance("blast");
Unmarshaller u = jc.createUnmarshaller();
u.setSchema(null);
return u.unmarshal(blast)

I've seen similar questions for disabling SAX parsing from validation by setting the apache property http://apache.org/xml/features/validation/schema to false, but I can't get the Unmarshaller to use my own sax parser.

Below is sample code that demonstrates how to get a JAXB (JSR-222) implementation to use your SAX parser:

import java.io.FileReader;
import javax.xml.XMLConstants;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.transform.sax.SAXSource;

import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;

public class Demo {

    public static void main(String[] args) throws Exception {
        JAXBContext jc = JAXBContext.newInstance(Foo.class);

        SAXParserFactory spf = SAXParserFactory.newInstance();
        spf.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
        XMLReader xmlReader = spf.newSAXParser().getXMLReader();
        InputSource inputSource = new InputSource(new FileReader("input.xml"));
        SAXSource source = new SAXSource(xmlReader, inputSource);

        Unmarshaller unmarshaller = jc.createUnmarshaller();
        Foo foo = (Foo) unmarshaller.unmarshal(source);
        System.out.println(foo.getValue());
    }

}

Building on the answers from @blaise-doughan and @aerobiotic, here is a solution that worked for me:

import java.io.FileReader;
import javax.xml.XMLConstants;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.transform.sax.SAXSource;

import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;

public class Demo2 {

    public static void main(String[] args) throws Exception {

        JAXBContext jc = JAXBContext.newInstance(MyBean.class);

        SAXParserFactory spf = SAXParserFactory.newInstance();
        spf.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
        spf.setFeature("http://xml.org/sax/features/validation", false);

        XMLReader xmlReader = spf.newSAXParser().getXMLReader();
        InputSource inputSource = new InputSource(
                new FileReader("myfile.xml"));
        SAXSource source = new SAXSource(xmlReader, inputSource);

        Unmarshaller unmarshaller = jc.createUnmarshaller();
        MyBean foo = (MyBean) unmarshaller.unmarshal(source);
    }
}

You can create the Unmarshaller directly from a javax.xml.transform.sax.SAXSource.

See the example on this page: http://docs.oracle.com/cd/E17802_01/webservices/webservices/docs/1.6/api/javax/xml/bind/Unmarshaller.html

Than you "only" need to provide your own URIResolver to that SAXSource

Check out this resource https://java.net/projects/jaxb/lists/users/archive/2003-11/message/60 It worked for me when best answer wasn't working.

来源：https://stackoverflow.com/questions/9909465/how-to-disable-dtd-fetching-using-jaxb2-0

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