CentOS 8
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OpenJDK 8 : Install
2019/12/12
 
Install OpenJDK 8.
[1] If you need only JRE, Install only [java-1.8.0-openjdk] package,
but if you need compiler, Install [java-1.8.0-openjdk-devel] package, too.
[root@dlp ~]#
dnf -y install java-1.8.0-openjdk java-1.8.0-openjdk-devel
[root@dlp ~]#
cat > /etc/profile.d/java.sh <<'EOF'
export JAVA_HOME=$(dirname $(dirname $(readlink $(readlink $(which java)))))
export PATH=$PATH:$JAVA_HOME/bin
EOF
[root@dlp ~]#
source /etc/profile.d/java.sh
[root@dlp ~]#
java -version

openjdk version "1.8.0_232"
OpenJDK Runtime Environment (build 1.8.0_232-b09)
OpenJDK 64-Bit Server VM (build 25.232-b09, mixed mode)
# verify to create test program

[root@dlp ~]# cat > java_test.java <<'EOF'
class java_test {
    public static void main(String[] args) {
        System.out.println("Hello Java World !");
    }
}
EOF 

[root@dlp ~]#
javac java_test.java

[root@dlp ~]#
java java_test

Hello Java World !
[2] If you installed multiple version of Java from CentOS official repository, it's possbile to switch them with [alternatives].
[root@dlp ~]#
alternatives --config java

There are 2 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
 + 1           java-11-openjdk.x86_64 (/usr/lib/jvm/java-11-openjdk-11.0.5.10-0.el8_0.x86_64/bin/java)
*  2           java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.232.b09-0.el8_0.x86_64/jre/bin/java)

Enter to keep the current selection[+], or type selection number: 2

[root@dlp ~]#
alternatives --config javac

There are 2 programs which provide 'javac'.

  Selection    Command
-----------------------------------------------
 + 1           java-11-openjdk.x86_64 (/usr/lib/jvm/java-11-openjdk-11.0.5.10-0.el8_0.x86_64/bin/javac)
*  2           java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.232.b09-0.el8_0.x86_64/bin/javac)

Enter to keep the current selection[+], or type selection number: 2

[root@dlp ~]#
java -version

openjdk version "1.8.0_232"
OpenJDK Runtime Environment (build 1.8.0_232-b09)
OpenJDK 64-Bit Server VM (build 25.232-b09, mixed mode)
[root@dlp ~]#
javac -version

javac 1.8.0_232
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