JDK 설치 및 환경설정

1. JDK 설치(version 8)

   $ sudo yum install java-1.8.0-openjdk-devel
   

2. JAVA_HOME 환경변수 설정

   • 환경파일에 JAVA_HOME 추가 (JAVA_HOME="/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.151-1.b12.el7_4.x86_64")

     $ sudo vi ~/.bashrc
     ## Java Home
     export JAVA_HOME="/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.111-2.b15.el7_3.x86_64"
     
     $ source ~/.bashrc
     
     $ echo $JAVA_HOME
     /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.111-2.b15.el7_3.x86_64
     

3. Default JDK 설정 (2개 이상 설치 된 경우)
   • 설치 목록 확인 및 변경

     $ sudo yum install alternatives
     

   • default 확인

     $ sudo /usr/sbin/alternatives --config java
      Selection Path Priority Status
     ------------------------------------------------------------
     0 /usr/lib/jvm/java-8-oracle/jre/bin/java 1081 auto mode
     1 /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1081 manual mode
     * 2 /usr/lib/jvm/java-8-oracle/jre/bin/java 1081 manual mode