如果已经启动了Jenkins，可以到插件管理-高级里更改镜像地址
也可以在安装插件前，定位到以下地址，更改镜像地址后，再继续安装
{JENKINS_ROOT_URL}/pluginManager/advanced
常用镜像地址：
https://mirrors.tuna.tsinghua.edu.cn/jenkins/updates/update-center.json
No Compiler is Provided in this environment Perhaps you are running on JRE rather than a JDK
Jenkins流水线部署Java项目提示：No Compiler is Provided in this environment Perhaps you are running on JRE rather than a JDK
可能的原因是调用了/usr/bin/java，但是这个指向的是jre。
# ls -l /usr/bin/java
lrwxrwxrwx 1 root root 22 Jul 4 2020 /usr/bin/java -> /etc/alternatives/java
如果是这样，要找到JDK的地址并更改软连接
#whereis java
java: /usr/bin/java /usr/lib/java /etc/java /usr/share/java /data/soft/jdk1.8.0_151/bin/java /data/soft/jdk1.8.0_151/jre/bin/java /usr/share/man/man1/java.1.gz
rm /usr/bin/java
ln -s /data/soft/jdk1.8.0_151/bin/java /usr/bin/java