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java.net.UnknownHostException: repo1.maven.org	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:177)	at java.net.Socket.connect(Socket.java:519)	at java.net.Socket.connect(Socket.java:469)	at sun.net.NetworkClient.doConnect(NetworkClient.java:157)	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.(HttpClient.java:233)	at sun.net.www.http.HttpClient.New(HttpClient.java:306)	at sun.net.www.http.HttpClient.New(HttpClient.java:323)