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java.net.UnknownHostException: .	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:153)	at java.net.Socket.connect(Socket.java:426)	at java.net.Socket.connect(Socket.java:376)	at sun.net.NetworkClient.doConnect(NetworkClient.java:139)	at sun.net.NetworkClient.openServer(NetworkClient.java:118)	at sun.net.ftp.FtpClient.openServer(FtpClient.java:423)	at sun.net.ftp.FtpClient.(FtpClient.java:687)	at sun.net.www.protocol.ftp.FtpURLConnection.connect(FtpURLConnection.java:175)	at sun.net.www.protocol.ftp.FtpURLConnection.getInputStream(FtpURLConnection.java:257)	at java.net.URL.openStream(URL.java:960)	at weblogic.apache.xerces.impl.XMLEntityManager.startEntity(XMLEntityManager.java:836)	at weblogic.apache.xerces.impl.XMLEntityManager.startDTDEntity(XMLEntityManager.java:796)	at weblogic.apache.xerces.impl.XMLDTDScannerImpl.setInputSource(XMLDTDScannerImpl.java:275)	at weblogic.apache.xerces.impl.XMLDocumentScannerImpl$DTDDispatcher.dispatch(XMLDocumentScannerImpl.java:841)	at weblogic.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:329)	at weblogic.apache.xerces.parsers.DTDConfiguration.parse(DTDConfiguration.java:525)	at weblogic.apache.xerces.parsers.DTDConfiguration.parse(DTDConfiguration.java:581)	at weblogic.apache.xerces.parsers.XMLParser.parse(XMLParser.java:152)	at weblogic.apache.xerces.parsers.DOMParser.parse(DOMParser.java:257)	at weblogic.apache.xerces.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:201)	at weblogic.xml.jaxp.RegistryDocumentBuilder.parse(RegistryDocumentBuilder.java:149)	at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:151)	at weblogic.management.commo.WebLogicMBeanMaker.main(WebLogicMBeanMaker.java:720)