为什么我得到javax.net.ssl.SSLException：收到致命警报：

Question

我在2018年6月之后收到此错误：javax.net.ssl.SSLException: Received fatal alert: protocol_version        at sun.security.ssl.Alerts.getSSLException(Alerts.java:208)        at sun.security.ssl.Alerts.getSSLException(Alerts.java:154)        at sun.security.ssl.SSLSocketImpl.recvAlert(SSLSocketImpl.java:1979)        at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1086)        at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1332)        at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1359)        at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1343)        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.https.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:153)        at org.apache.tools.ant.taskdefs.Get$GetThread.openConnection(Get.java:731)        at org.apache.tools.ant.taskdefs.Get$GetThread.get(Get.java:652)        at org.apache.tools.ant.taskdefs.Get$GetThread.run(Get.java:642)