JDK 설치 및 환경설정

1. JDK 설치(version 8)

   $ sudo apt-get install software-properties-common
   $ sudo add-apt-repository ppa:webupd8team/java
   $ sudo apt-get update
   $ sudo apt-get install oracle-java8-installer
   

2. Default JDK 설정 (2개 이상 설치 된 경우)

   • 설치 목록 확인 및 변경

     $ sudo update-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
     
     Press <enter> to keep the current choice[*], or type selection number: 2
     

   • default 확인

     $ sudo update-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
     

3. JAVA_HOME 환경변수 설정

   • 위 default 설정된 jdk의 경로 복사(/usr/lib/jvm/java-8-oracle)

   • 환경파일에 JAVA_HOME 추가 (JAVA_HOME="/usr/lib/jvm/java-8-oracle")

     $ sudo vi /etc/environment
     $ source /etc/environment
     $ echo $JAVA_HOME
     /usr/lib/jvm/java-8-oracle