linux tomcat 启动报错 Neither the JAVA_HOME nor the JRE_HOME environment variable is defined At least one of these environment variable is needed to run this program

报错信息

Neither the JAVA_HOME nor the JRE_HOME environment variable is defined
At least one of these environment variable is needed to run this program

原因：找不到jdk或者jre路径。

解决办法：打开tomcat的bin目录下面的setclasspath.sh，添加如下代码，路径修改为自己机器jdk和jre路径即可。

export JAVA_HOME=/home/soft/jdk1.8.0_171/
export JRE_HOME=/home/soft/jdk1.8.0_171/jre

参考：https://blog.csdn.net/jeamking/article/details/7881196