Exception in thread "main" javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target	at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)	at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1949)	at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:302)	at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:296)	at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1509)	at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:216)	at sun.security.ssl.Handshaker.processLoop(Handshaker.java:979)	at sun.security.ssl.Handshaker.process_record(Handshaker.java:914)	at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1062)	at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1375)	at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1403)	at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1387)	at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:559)	at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185)	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1513)	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1441)	at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)	at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(HttpsURLConnectionImpl.java:338)	at com.microsoft.azure.iot.service.transport.http.HttpConnection.getResponseStatus(HttpConnection.java:236)	at com.microsoft.azure.iot.service.transport.http.HttpRequest.send(HttpRequest.java:76)	at com.microsoft.azure.iot.service.sdk.RegistryManager.addDevice(RegistryManager.java:108)	at xxxx.azure.CreateDevIdentity.main(CreateDevIdentity.java:24)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)

keytool -import -file E:\azure-devices.cn.cer -keystore "C:\Program Files\Java\jdk1.8.0_66\jre\lib\security\cacerts" -alias azure-devices.cn