linux tomcat启动报错：Neither the JAVA_HOME nor the JRE_HOME environment variable is defined

解决方法：

1、先找出java安装路径

$ which java

/data/apps/java/jdk1.8.0_91/bin/java

2、在catalina.sh中加入配置

JAVA_HOME=/data/apps/java/jdk1.8.0_91
JRE_HOME=/data/apps/java/jdk1.8.0_91/jre