#6. OpenJDK 1.8 설정

[root@flas ~]#  yum install java-1.8.0-openjdk

[root@flas ~]# yum install java-1.8.0-openjdk-devel


-- 들어가서 설치위치 확인
[root@flas ~]# cd /usr/lib/jvm/ 

--환경변수 등록
[root@flas ~]# readlink -f /usr/bin/java /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.312.b07-1.el7_9.x86_64

-- JAVA_HOME, PATH, CLASSPATH 등록
[root@flas ~]# vi /etc/profile
....

JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.312.b07-1.el7_9.x86_64
PATH=$PATH:$JAVA_HOME/bin
CLASSPATH=$JAVA_HOME/jre/lib:$JAVA_HOME/lib/tools.jar

export JAVA_HOME PATH CLASSPATH

-- 환경 변수를 등록했다면 ssh연결을 재시작하거나 소스적용
[root@flas ~]# source /etc/profile

-- 환경변수 확인
[root@flas java-1.8.0-openjdk-1.8.0.312.b07-1.el7_9.x86_64]# echo $JAVA_HOME
/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.312.b07-1.el7_9.x86_64

[root@flas java-1.8.0-openjdk-1.8.0.312.b07-1.el7_9.x86_64]# echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.312.b07-1.el7_9.x86_64/bin

[root@flas java-1.8.0-openjdk-1.8.0.312.b07-1.el7_9.x86_64]# echo $CLASSPATH
/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.312.b07-1.el7_9.x86_64/jre/lib:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.312.b07-1.el7_9.x86_64/lib/tools.jar