tomcat启动报错Cannot find usrlocaltomcatbinsetclasspath.sh原因

在用命令

./startup.sh

启动tomcat时报错：

Cannot find /usr/local/tomcat/bin/setclasspath.sh
This file is needed to run this program

在tomcat的bin目录下我们看下catalina.sh文件：

vi catalina.sh
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搜索下setclasspath：

？setclasspath
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然后我们定位到搜索的地方：

if $os400; then
  # -r will Only work on the os400 if the files are:
  # 1. owned by the user
  # 2. owned by the PRIMARY group of the user
  # this will not work if the user belongs in secondary groups
  . "$CATALINA_HOME"/bin/setclasspath.sh
else
  if [ -r "$CATALINA_HOME"/bin/setclasspath.sh ]; then
    . "$CATALINA_HOME"/bin/setclasspath.sh
  else
    echo "Cannot find $CATALINA_HOME/bin/setclasspath.sh"
    echo "This file is needed to run this program"
    exit 1
  fi
fi
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报这个错是因为$CATALINA_HOME配置的有问题导致无法找到/bin/setclasspath.sh导致的。

解决：

1.因为$CATALINA_HOME是配置在/etc/profile中的，所以我们修改下/etc/profile：

vi  /etc/profile
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2.修改tomcat的配置信息TOMCAT_HOME和CATALINA_HOME为自己的tomcat文件位置，我的是下面这样：

export TOMCAT_HOME=/usr/local/tomcat/apache-tomcat-9.0.40
export CATALINA_HOME=/usr/local/tomcat/apache-tomcat-9.0.40
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3.设置环境变量立即生效：

source /etc/profile
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4.最后再启动tomcat就好啦

5.如果你的tomcat是使用 docker 安装启动报这个错的话：

• 请使用 tomcat:9-jdk8-temurin-focal 这个镜像来解决报错

docker中此报错的其他解决办法你可以参考其他文章：
Latest image incompatible with old versions of docker engine
Tomcat 9 running on docker - Cannot find /usr/local/tomcat/bin/setclasspath.sh
Tomcat 9 running on docker - Cannot find /usr/local/tomcat/bin/setclasspath.sh