jenkins java编译错误：
3.5.4/conf/settings.xml
The JAVA_HOME environment variable is not defined correctly
This environment variable is needed to run this program
NB: JAVA_HOME should point to a JDK not a JRE
Build step 'Invoke top-level Maven targets' marked build as failure
Finished: FAILURE
原因：
JAVA_HOME错误
在docker运行项目下面：
bash-4.4# java -verbose
第一行的路径
Opened /usr/lib/jvm/java-1.8-openjdk/jre/lib/rt.jar 拷贝：/usr/lib/jvm/java-1.8-openjdk到jenkins全局配置工具
然后再次jenkins编辑项目，就可以解决问题
