[AWS EC2] JAVA 설치

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JAVA 설치

 

sudo apt-get install openjdk-8-jdk

 

JAVA Defalut 설치

 

sudo apt-get install default-jdk

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JAVA 확인

 

java -version

 

ubuntu@ip-172-31-13-208:~$ java -version
openjdk version "1.8.0_312"
OpenJDK Runtime Environment (build 1.8.0_312-8u312-b07-0ubuntu1~20.04-b07)
OpenJDK 64-Bit Server VM (build 25.312-b07, mixed mode)

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JAVA 여러개 깔려 있을 때 기본 JAVA 선택

 

sudo update-alternatives --config java

 

ubuntu@ip-172-31-13-208:~$ sudo update-alternatives --config java
There are 2 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                                            Priority   Status
------------------------------------------------------------
* 0            /usr/lib/jvm/java-11-openjdk-amd64/bin/java      1111      auto mode
  1            /usr/lib/jvm/java-11-openjdk-amd64/bin/java      1111      manual mode
  2            /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java   1081      manual mode

Press <enter> to keep the current choice[*], or type selection number: 2
update-alternatives: using /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java to provide /usr/bin/java (java) in manual mode

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자바 환경변수 파일 열기

 

sudo nano /etc/environment

 

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자바 환경 변수 설정 추가

 

JAVA_HOME="/usr/lib/jvm/java-8-openjdk-amd64"

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환경 변수 설정 변경 사항 저장

 

source /etc/environment

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환경변수 제대로 설치 되었는지 확인

 

ubuntu@ip-172-31-13-208:~$ echo $JAVA_HOME
/usr/lib/jvm/java-8-openjdk-amd64

 

echo $JAVA_HOME

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