无法建立CAS服务器

Question

我想赶上JASIG的CAS服务器。我已经成功地为Tomcat（8.5是）生成了密钥，将密钥导入到Java密钥存储中，并正在尝试使用内置的构建脚本dev-build-no-tests.sh构建从GitHub下载的CAS项目。我无法通过的是这一步，因为我运行构建脚本时引发的异常。

Downloading https://services.gradle.org/distributions/gradle-2.10-bin.zip 

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:1514) 
    at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:216) 
    at sun.security.ssl.Handshaker.processLoop(Handshaker.java:1026) 
    at sun.security.ssl.Handshaker.process_record(Handshaker.java:961) 
    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:1546) 
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1474) 
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254) 
    at org.gradle.wrapper.Download.downloadInternal(Download.java:58) 
    at org.gradle.wrapper.Download.download(Download.java:44) 
    at org.gradle.wrapper.Install$1.call(Install.java:61) 
    at org.gradle.wrapper.Install$1.call(Install.java:48) 
    at org.gradle.wrapper.ExclusiveFileAccessManager.access(ExclusiveFileAccessManager.java:65) 
    at org.gradle.wrapper.Install.createDist(Install.java:48) 
    at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:128) 
    at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:61) 
Caused by: 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.validator.PKIXValidator.doBuild(PKIXValidator.java:387) 
    at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:292) 
    at sun.security.validator.Validator.validate(Validator.java:260) 
    at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:324) 
    at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:229) 
    at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:124) 
    at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1496) 
    ... 20 more 
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target 
    at sun.security.provider.certpath.SunCertPathBuilder.build(SunCertPathBuilder.java:141) 
    at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:126) 
    at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:280) 
    at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:382) 
    ... 26 more 

这里有什么问题？我究竟做错了什么？我试图找到一个线索，但目前为止没有好处。 据我所知，这似乎是一个问题，当试图下载这个gradle版本。我不明白的是为什么会发生这种情况，以及如何解决这个问题。

Answer 1

您要下载的不信任列表

你可以尝试2只选择一个域名，

1. 与HTTP URL，而不是HTTPS URL
2. 你可以尝试解决此问题的方法是从 services.gradle.org（.cer文件）下载证书，然后将它们安装到您的 java信任库中。请确保您下载此域的任何父证书 并安装它们。一旦你这样做，你应该能够继续前进。