java.net.UnknownHostException: java.sun.com
   at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:177)
   at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
   at java.net.Socket.connect(Socket.java:529)
   at java.net.Socket.connect(Socket.java:478)
   at sun.net.NetworkClient.doConnect(NetworkClient.java:163)
   at sun.net.www.http.HttpClient.openServer(HttpClient.java:394)
   at sun.net.www.http.HttpClient.openServer(HttpClient.java:529)
   at sun.net.www.http.HttpClient.<init>(HttpClient.java:233)
   at sun.net.www.http.HttpClient.New(HttpClient.java:306)
   at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:867)
   at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:815)
   at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:726)
   at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1049)
   at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(XMLEntityManager.java:677)
   at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startEntity(XMLEntityManager.java:1315)
   at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startDTDEntity(XMLEntityManager.java:1282)
   at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.setInputSource(XMLDTDScannerImpl.java:283)
   at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.dispatch(XMLDocumentScannerImpl.java:1194)
   at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.next(XMLDocumentScannerImpl.java:1090)
   at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:1003)
   at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
   at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:511)
   at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:808)
   at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
   at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:119)
   at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)
   at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
   at org.netbeans.modules.j2ee.dd.impl.common.ParseUtils.getVersion(ParseUtils.java:74)
   at org.netbeans.modules.j2ee.dd.impl.web.WebParseUtils.getVersion(WebParseUtils.java:68)
   at org.netbeans.modules.j2ee.dd.api.web.DDProvider.getDDRoot(DDProvider.java:130)
   at org.netbeans.modules.websvc.rest.spi.WebRestSupport.findWebApp(WebRestSupport.java:111)
   at org.netbeans.modules.maven.jaxws.MavenProjectRestSupport.upgrade(MavenProjectRestSupport.java:119)
   at org.netbeans.modules.websvc.rest.RestUtils.upgrade(RestUtils.java:86)
   at org.netbeans.modules.websvc.rest.nodes.RestServicesNodeFactory.createNodes(RestServicesNodeFactory.java:85)
   at org.netbeans.spi.project.ui.support.NodeFactorySupport$DelegateChildren$1.run(NodeFactorySupport.java:193)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:602)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1084)