Install Java
# sudo add-apt-repository ppa:webupd8team/java
# sudo apt-get update
# sudo apt-get install oracle-java8-installer
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Verify Installed Java Version
# java -version
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java version "1.8.0_144"
Java(TM) SE Runtime Environment (build 1.8.0_144-b01)
Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)
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Setup Java Environment
# sudo apt-get install oracle-java8-set-default
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Now add the JAVA_HOME and JRE_HOME environment variable in /etc/environment configuration file using the following command.
# vim /etc/environment
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Insert below lines at end of the file
JAVA_HOME=/usr/lib/jvm/java-8-oracle
JRE_HOME=/usr/lib/jvm/java-8-oracle/jre
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