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java.net.UnknownHostException: java.sun.com	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:177)	at java.net.Socket.connect(Socket.java:507)	at java.net.Socket.connect(Socket.java:457)	at sun.net.NetworkClient.doConnect(NetworkClient.java:157)	at sun.net.www.http.HttpClient.openServer(HttpClient.java:365)	at sun.net.www.http.HttpClient.openServer(HttpClient.java:477)	at sun.net.www.http.HttpClient.(HttpClient.java:214)	at sun.net.www.http.HttpClient.New(HttpClient.java:287)	at sun.net.www.http.HttpClient.New(HttpClient.java:299)	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:792)	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:744)	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:669)	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:913)	at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(XMLEntityManager.java:973)	at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startEntity(XMLEntityManager.java:905)	at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startDTDEntity(XMLEntityManager.java:872)	at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.setInputSource(XMLDTDScannerImpl.java:282)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDispatcher.dispatch(XMLDocumentScannerImpl.java:1021)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:368)	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:834)	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:764)	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:148)	at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:250)	at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:292)