Install Java in CentOS/Redhat
After extracting java file use alternatives command to install it. alternatives command is available in chkconfig package.
Also insert above environment variables in /etc/environment file.
# cd /opt
# wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u161-b12/2f38c3b165be4555a1fa6e98c45e0808/jdk-8u161-linux-x64.tar.gz"
# tar xzf jdk-8u161-linux-x64.tar.gz
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After extracting java file use alternatives command to install it. alternatives command is available in chkconfig package.
# cd /opt/jdk1.8.0_161/
# alternatives --install /usr/bin/java java /opt/jdk1.8.0_161/bin/java 2
# alternatives --config java
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There is 1 program that provides 'java'.
Selection Command
-----------------------------------------------
*+ 1 /opt/jdk1.8.0_161/bin/java
Enter to keep the current selection[+], or type selection number: 1
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Setup javac and jar commands path using alternatives:
# alternatives --install /usr/bin/jar jar /opt/jdk1.8.0_161/bin/jar 2
# alternatives --install /usr/bin/javac javac /opt/jdk1.8.0_161/bin/javac 2
# alternatives --set jar /opt/jdk1.8.0_161/bin/jar
# alternatives --set javac /opt/jdk1.8.0_161/bin/javac
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Check Java Version
# java -version
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Set Java Environment Variable
Setup JAVA_HOME, JRE_HOME and PATH environment variables
# export JAVA_HOME=/opt/jdk1.8.0_161
# export JRE_HOME=/opt/jdk1.8.0_161/jre
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