1.环境变量配置好之后无效果。
解决：终端输入source /etc/profile环境变量配置文件
2.Tomcat运行时报错。
问题：[root@xxx bin]# ./catalina.sh run
Using CATALINA_BASE: /user/tomcat
Using CATALINA_HOME: /usr/tomcat
Using CATALINA_TMPDIR: /user/tomcat/temp
Using JRE_HOME: /usr/java/jdk1.8.0_151
Using CLASSPATH: /usr/tomcat/bin/bootstrap.jar:/usr/tomcat/bin/tomcat-juli.jar
\u4e8c\u6708 02, 2018 9:40:55 \u4e0a\u5348 org.apache.catalina.startup.Catalina initDirs
\u4e25\u91cd: Cannot find specified temporary folder at /user/tomcat/temp
\u4e8c\u6708 02, 2018 9:40:55 \u4e0a\u5348 org.apache.catalina.startup.Catalina load
\u8b66\u544a: Unable to load server configuration from [/user/tomcat/conf/server.xml]
\u4e8c\u6708 02, 2018 9:40:55 \u4e0a\u5348 org.apache.catalina.startup.Catalina initDirs
\u4e25\u91cd: Cannot find specified temporary folder at /user/tomcat/temp
\u4e8c\u6708 02, 2018 9:40:55 \u4e0a\u5348 org.apache.catalina.startup.Catalina load
\u8b66\u544a: Unable to load server configuration from [/user/tomcat/conf/server.xml]
\u4e8c\u6708 02, 2018 9:40:55 \u4e0a\u5348 org.apache.catalina.startup.Catalina start
\u4e25\u91cd: Cannot start server. Server instance is not configured.
解决：环境变量配置的有问题，应该是usr缺打成user。