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java.lang.NullPointerException: 	at com.sun.security.ntlm.Client.type3(Client.java:161)	at sun.net.www.protocol.http.ntlm.NTLMAuthentication.buildType3Msg(NTLMAuthentication.java:241)	at sun.net.www.protocol.http.ntlm.NTLMAuthentication.setHeaders(NTLMAuthentication.java:216)	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1607)	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1441)	at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)	at com.blackduck.proxy.TestProxyHttpUrlConnection.connect(TestProxyHttpUrlConnection.java:43)	at com.blackduck.proxy.TestProxyHttpUrlConnection.main(TestProxyHttpUrlConnection.java:31)