macOS 初次启动tomcat失败，报错：
The operation couldn’t be completed. Unable to locate a Java Runtime.
Please visit http://www.java.com/ for information on installing Java.
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
已经安装了jdk并且配置了环境变量，可能是jdk装在用户目录下的library而非根目录下的原因？
求帮忙
