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Unknown host exception while parsing xml file

when I try to parse xml, I get the following exception: -

java.net.UnknownHostException: hibernate.sourceforge.net at java.net.AbstractPlainSocketImpl.connect(Unknown Source) at java.net.PlainSocketImpl.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at sun.net.NetworkClient.doConnect(Unknown Source) at sun.net.www.http.HttpClient.openServer(Unknown Source) at sun.net.www.http.HttpClient.openServer(Unknown Source) at sun.net.www.http.HttpClient.<init>(Unknown Source) at sun.net.www.http.HttpClient.New(Unknown Source) at sun.net.www.http.HttpClient.New(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) at org.apache.xerces.impl.XMLEntityManager.setupCurrentEntity(Unknown Source) at org.apache.xerces.impl.XMLEntityManager.startEntity(Unknown Source) at org.apache.xerces.impl.XMLEntityManager.startDTDEntity(Unknown Source) at org.apache.xerces.impl.XMLDTDScannerImpl.setInputSource(Unknown Source) at org.apache.xerces.impl.XMLDocumentScannerImpl$DTDDispatcher.dispatch(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) at org.apache.xerces.parsers.XMLParser.parse(Unknown Source) at org.apache.xerces.parsers.DOMParser.parse(Unknown Source) at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source) at javax.xml.parsers.DocumentBuilder.parse(Unknown Source)

The code I'm using to parse the XML is below: -

 File hbmFile = new File(hbmFileName); DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); DocumentBuilder db = dbf.newDocumentBuilder(); Document doc = db.parse(hbmFile);

I am trying to parse the xml that was written for hibernation, it is actually a hibernation display file.

The xml I'm trying to parse is below: -

 <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping> <class name="org.hibernate.entity.Student" table="table_student"> <id name="rollNo" column="rool_no" type="int"/> <property name="name" column="st_name" type="string"/> <set name="marks" table="table_marks"> <key column="roll_no"/> <composite-element class="org.hibernate.entity.StudentMarks"> <property name="subject" column="st_sub"/> <property name="marks" column="st_marks"/> </composite-element> </set> </class> </hibernate-mapping>

Please, help.

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3 answers

I used the following code and it works fine for me.

 DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); dbf.setValidating(false); DocumentBuilder db = dbf.newDocumentBuilder(); db.setEntityResolver(new EntityResolver() { @Override public InputSource resolveEntity(String arg0, String arg1) throws SAXException, IOException { if(arg0.contains("Hibernate")) { return new InputSource(new StringReader("")); } else { // TODO Auto-generated method stub return null; } } }); Document doc = db.parse(hbmFile);
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The parser tries to download the DTD from hibernate.sourceforge.net to check the parsed XML.

However, the DNS client on the computer cannot resolve this hostname for any reason (it allows a fine of up to 82.98.86.175 on my machine).

To avoid this problem, you should tell DocumentBuilderFactory ignore DTD:

 File hbmFile = new File(hbmFileName); DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); dbf.setValidating(false); dbf.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false); DocumentBuilder db = dbf.newDocumentBuilder(); Document doc = db.parse(hbmFile);

See Make DocumentBuilder.parse ignore DTD links .

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I am also trying to read from an XML file with the dtd tag

 <!DOCTYPE grammar PUBLIC "-//W3C//DTD GRAMMAR 1.0//EN" "http://www.w3.org/TR/speech-grammar/grammar.dtd">

and code

 File fXmlFile = new File(grammarXML); DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance(); DocumentBuilder dBuilder = dbFactory.newDocumentBuilder(); Document doc = dBuilder.parse(fXmlFile);

I was getting the same error.

 java.net.UnknownHostException:

The server on which the code is deployed does not have access to w3.org. When I open w3.org in a browser, it opens a page with a disconnected connection. I gave access to w3.org and it solved the problem.

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