following is the error showed while i project connect.
what should i do to solve the problem?



org.dom4j.DocumentException: hibernate.sourceforge.net Nested exception: hibernate.sourceforge.net
at org.dom4j.io.SAXReader.read(SAXReader.java:358)
at org.dom4j.io.SAXReader.read(SAXReader.java:219)
at net.sf.hibernate.cfg.Configuration.addFile(Configuration.java:155)
at net.sf.hibernator.HibernateConnection.createConnection(HibernateConnection.java:168)
at net.sf.hibernator.views.ConnectionView$8.run(ConnectionView.java:199)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:113)
Nested exception:
java.net.UnknownHostException: hibernate.sourceforge.net
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 java.net.URL.openStream(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.DTDConfiguration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.dom4j.io.SAXReader.read(SAXReader.java:339)
at org.dom4j.io.SAXReader.read(SAXReader.java:219)
at net.sf.hibernate.cfg.Configuration.addFile(Configuration.java:155)
at net.sf.hibernator.HibernateConnection.createConnection(HibernateConnection.java:168)
at net.sf.hibernator.views.ConnectionView$8.run(ConnectionView.java:199)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:113)
rethrown as net.sf.hibernate.MappingException: hibernate.sourceforge.net Nested exception: hibernate.sourceforge.net
at net.sf.hibernate.cfg.Configuration.addFile(Configuration.java:159)
at net.sf.hibernator.HibernateConnection.createConnection(HibernateConnection.java:168)
at net.sf.hibernator.views.ConnectionView$8.run(ConnectionView.java:199)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:113)
Caused by: org.dom4j.DocumentException: hibernate.sourceforge.net Nested exception: hibernate.sourceforge.net
at org.dom4j.io.SAXReader.read(SAXReader.java:358)
at org.dom4j.io.SAXReader.read(SAXReader.java:219)
at net.sf.hibernate.cfg.Configuration.addFile(Configuration.java:155)
... 3 more

which version of hibernate are you using.

from the stacktrace it seems to be hibernate 2.

so check that your mapping files refer to hibernate 2.0 dtd.

if i change using the hinernate2 to hinernate3, is that the hibernate2 need to be deleted?
any project using hibernate in eclipse can be refer?
thank you~

You need to edit your configuration and mapping files. Their formats and contents have changed, and the link to the DTD at the top of those files is different too. Section 1.2 of the ref docs has all the info.