UnknownHostException错误，构建java grpc示例

我正在跟随，我甚至还没能完成第一步。第一步是git克隆项目，然后运行

cd examples
./gradlew installDist

我被这个堆栈跟踪击中了

Downloading https://services.gradle.org/distributions/gradle-2.13-bin.zip

Exception in thread "main" java.net.UnknownHostException: services.gradle.org
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:668)
    at sun.security.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:173)
    at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
    at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:264)
    at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:367)
    at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1105)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:999)
    at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1513)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1441)
    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)

并添加了行

systemProp.http.proxyHost=<my proxy>
systemProp.http.proxyPort=<my port>

也就是说，我切换了https-->http

在所有这些之后，我仍然得到相同的堆栈跟踪

有人有什么建议吗

编辑：我添加了一个

gradle.properties

文件，并添加了字段

systemProp.http.proxyHost
systemProd.http.proxyPort

及

但我还是犯了和以前一样的错误。但是，构建脚本似乎在这一行上暂停

Downloading https://services.gradle.org/distributions/gradle-2.13-bin.zip

---

大约10秒钟，然后失败。所以进展？

我不知道这是否是一个最佳的解决方案，但最终对我有效的方法是替换

distributionUrl=https\://services.gradle.org/distributions/gradle-2.13-bin.zip 

与

本质上是升级我正在抓取的gradle版本

我还添加了一个全局

~/.gradle/gradle.properties

---

在我的主目录中，包含我以前声明的所有代理信息。我尝试在执行此操作后构建失败，但我不能确定这样做是否没有任何影响。

我遇到了相同的问题，并在2小时后最终找到了此解决方案

转到项目中的文件gradlew.bat，更改DEFAULT\u JVM\u OPTS变量，如下所示：

set DEFAULT_JVM_OPTS=-Dhttp.proxyHost=YOUR_HOST -Dhttp.proxyPort=PORT -Dhttp.proxyUser=USERNAME -Dhttp.proxyPassword=PASSWORD -Dhttps.proxyHost=YOUR_HOST -Dhttps.proxyPort=PORT -Dhttps.proxyUser=USERNAME -Dhttps.proxyPassword=PASSWORD

然后运行

gradlew clean build

distributionUrl=https\://services.gradle.org/distributions/gradle-2.13-bin.zip 

distributionUrl=https\://services.gradle.org/distributions/gradle-3.0-bin.zip

~/.gradle/gradle.properties

set DEFAULT_JVM_OPTS=-Dhttp.proxyHost=YOUR_HOST -Dhttp.proxyPort=PORT -Dhttp.proxyUser=USERNAME -Dhttp.proxyPassword=PASSWORD -Dhttps.proxyHost=YOUR_HOST -Dhttps.proxyPort=PORT -Dhttps.proxyUser=USERNAME -Dhttps.proxyPassword=PASSWORD