[23:15:05] [Downloader 0/INFO]: [STDERR]: 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
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1949)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:302)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:296)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1497)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:212)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.security.ssl.Handshaker.processLoop(Handshaker.java:979)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.security.ssl.Handshaker.process_record(Handshaker.java:914)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1062)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1375)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1403)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1387)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:563)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1512)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1440)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at xk.a(SourceFile:140)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at xk$$Lambda$1203/108034745.run(Unknown Source)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at com.google.common.util.concurrent.TrustedListenableFutureTask$TrustedFutureInterruptibleTask.runInterruptibly(TrustedListenableFutureTask.java:111)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at com.google.common.util.concurrent.InterruptibleTask.run(InterruptibleTask.java:58)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at com.google.common.util.concurrent.TrustedListenableFutureTask.run(TrustedListenableFutureTask.java:75)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at java.lang.Thread.run(Thread.java:745)
[23:15:05] [Downloader 0/INFO]: [STDERR]: Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:387)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:292)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.security.validator.Validator.validate(Validator.java:260)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:324)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:229)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:124)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1479)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	... 21 more
[23:15:05] [Downloader 0/INFO]: [STDERR]: Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.security.provider.certpath.SunCertPathBuilder.build(SunCertPathBuilder.java:145)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:131)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:280)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:382)
[23:15:05] [Downloader 0/INFO]: [STDERR]: 	... 27 more