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    Check if you don't have a VPN or something like this messing with your connection. Also, check Jenkins DNS configurations (try to start it with "--dns 8.8.8.8".

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via GitHub by puntogil
, 2 years ago
via Stack Overflow by bjoern
, 1 year ago
java.net.UnknownHostException: www.w3.org	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:175)	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:384)	at java.net.Socket.connect(Socket.java:546)	at java.net.Socket.connect(Socket.java:495)	at sun.net.NetworkClient.doConnect(NetworkClient.java:178)	at sun.net.www.http.HttpClient.openServer(HttpClient.java:409)	at sun.net.www.http.HttpClient.openServer(HttpClient.java:530)	at sun.net.www.http.HttpClient.(HttpClient.java:240)	at sun.net.www.http.HttpClient.New(HttpClient.java:321)	at sun.net.www.http.HttpClient.New(HttpClient.java:338)	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:935)	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:876)	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:801)	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1139)	at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(XMLEntityManager.java:654)	at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startEntity(XMLEntityManager.java:1292)	at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startEntity(XMLEntityManager.java:1229)	at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.startPE(XMLDTDScannerImpl.java:699)	at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.skipSeparator(XMLDTDScannerImpl.java:2046)	at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.scanDecls(XMLDTDScannerImpl.java:2009)	at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.scanDTDExternalSubset(XMLDTDScannerImpl.java:297)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.dispatch(XMLDocumentScannerImpl.java:1178)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.next(XMLDocumentScannerImpl.java:1065)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:978)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:625)	at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:116)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:488)	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:819)	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:748)	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:123)	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1208)	at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:525)	at org.xml.sax.helpers.XMLFilterImpl.parse(XMLFilterImpl.java:357)	at org.apache.xml.resolver.tools.ResolvingXMLFilter.parse(ResolvingXMLFilter.java:141)	at com.amphisoft.epub2pdf.content.XhtmlHandler.parseXhtml(Unknown Source)	at com.amphisoft.epub2pdf.content.XhtmlHandler.(Unknown Source)	at com.amphisoft.epub2pdf.content.XhtmlHandler.process(Unknown Source)	at com.amphisoft.epub2pdf.Converter.convert(Unknown Source)	at com.amphisoft.epub2pdf.Converter.main(Unknown Source)	at com.amphisoft.epub2pdf.Epub2Pdf.main(Unknown Source)