确认此前未安装过JDK，如果安装过先确认jdk不是gcj版本，否则Jenkins可能运行异常，需要卸载重装JDK；
# java -version
# yum remove java
# yum search openjdk
# yum install java-1.8.0-openjdk
[root@localhost ~]# java -version
openjdk version "1.8.0_161"
OpenJDK Runtime Environment (build 1.8.0_161-b14)
OpenJDK 64-Bit Server VM (build 25.161-b14, mixed mode)
原文：https://www.cnblogs.com/zhyj/p/12208938.html