Nacos启动报错解决：which: no javac in (/usr/local/sbin:/usr/local/bin:/

[root@localhost bin]# bash startup.sh -m standalone
which: no javac in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin)
readlink: 缺少操作数
Try 'readlink --help' for more information.
dirname: 缺少操作数
Try 'dirname --help' for more information.
ERROR: Please set the JAVA_HOME variable in your environment, We need java(x64)! jdk8 or later is better! !!

[root@localhost ~]# which java    //找到jdk位置
/usr/bin/java

[root@localhost ~]# ll /usr/bin/java 
lrwxrwxrwx. 1 root root 22 2月  24 12:26 /usr/bin/java -> /etc/alternatives/java

[root@localhost ~]# ll /etc/alternatives/java
lrwxrwxrwx. 1 root root 73 2月  24 12:26 /etc/alternatives/java -> /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.242.b08-0.el7_7.x86_64/jre/bin/java

[root@localhost ~]# ll /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.242.b08-0.el7_7.x86_64/

[root@centos7-2 nacos]# vi /etc/profile
# 在最后增加
export JAVA_HOME=/usr/lib/jvm/jre-1.8.0-openjdk-1.8.0.242.b08-0.el7_7.x86_64/          
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH
[root@localhost ~]# source /etc/profile

[root@localhost bin]# sh startup.sh -m standalone
/usr/lib/jvm/jre-1.8.0-openjdk-1.8.0.242.b08-
....
-server.max-http-header-size=524288
nacos is starting with standalone         //说明启动成功
nacos is starting，you can check the /usr/local/nacos/logs/start.out

[root@localhost bin]# cat /usr/local/nacos/logs/start.out
/usr/lib/jvm/jre-1.8.0-openjdk-1.8.0.242.b08-0.el7_7.x86_64//bin/java  -Xms512m -Xmx512m -Xmn256m -Dnacos.standalone=true -Djava.ext.dirs=/usr/lib/jvm/jre-1.8.0-openjdk-1.8.0.242.b08-0.el7_7.x86_64//jre/lib/ext:/usr/lib/jvm/jre-1.8.0-openjdk-1.8.0.242.b08-0.el7_7.x86_64//lib/ext -Xloggc:/usr/local/nacos/logs/nacos_gc.log -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCTimeStamps -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=100M -Dloader.path=/usr/local/nacos/plugins/health,/usr/local/nacos/plugins/cmdb,/usr/local/nacos/plugins/mysql -Dnacos.home=/usr/local/nacos -jar /usr/local/nacos/target/nacos-server.jar  --spring.config.location=classpath:/,classpath:/config/,file:./,file:./config/,file:/usr/local/nacos/conf/ --logging.config=/usr/local/nacos/conf/nacos-logback.xml --server.max-http-header-size=524288

         ,--.
       ,--.'|
   ,--,:  : |                                           Nacos 1.2.1
,`--.'`|  ' :                       ,---.               Running in stand alone mode, All function modules
|   :  :  | |                      '   ,'\   .--.--.    Port: 8848
:   |   \ | :  ,--.--.     ,---.  /   /   | /  /    '   Pid: 3882
|   : '  '; | /       \   /     \.   ; ,. :|  :  /`./   Console: http://xxxx:8848/nacos/index.html
'   ' ;.    ;.--.  .-. | /    / ''   | |: :|  :  ;_
|   | | \   | \__\/: . ..    ' / '   | .; : \  \    `.      https://nacos.io
'   : |  ; .' ," .--.; |'   ; :__|   :    |  `----.   \
|   | '`--'  /  /  ,.  |'   | '.'|\   \  /  /  /`--'  /
'   : |     ;  :   .'   \   :    : `----'  '--'.     /
;   |.'     |  ,     .-./\   \  /            `--'---'
'---'        `--`---'     `----'

2020-04-14 01:03:32,993 INFO Bean 'org.springframework.security.config.annotation.configuration.ObjectPostProcessorConf

[root@localhost bin]# ss -antulp | grep 8848
tcp    LISTEN     0      100      :::8848                 :::*                   users:(("java",pid=3882,fd=165))