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# Installing Java 8 ## Linux RHEL 7 & CentOS 7 ### Downloading Latest Java Archive **Note:** *If your Centos 7 is a fresh minimal installation, maybe you have to install wget utility using yum* ``` # yum -y install wget ``` Download latest Java SE Development Kit 8 release from its official download page or use following commands to download from shell ``` # 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/8u111-b14/jdk-8u111-linux-x64.tar.gz" # tar xzfv jdk-8u111-linux-x64.tar.gz ``` **Note:** *For production servers is highly recomended installing Java Server JRE. The Server JRE includes tools for JVM monitoring and tools commonly required for server applications, but does not include browser integration (the Java plug-in)* ``` # 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/8u111-b14/server-jre-8u111-linux-x64.tar.gz" # tar xzfv server-jre-8u111-linux-x64.tar.gz ``` ### Configuring Environment Variables Most of Java based application’s uses environment variables to work. CentOS provides of `/etc/profile.d/` directory for customizing environment variables per application ``` # echo "export JAVA_HOME=/opt/jdk1.8.0_111/" >> /etc/profile.d/java.sh # echo "export JRE_HOME=/opt/jdk1.8.0_111/jre/" >> /etc/profile.d/java.sh # echo "export PATH=\$PATH:\$JAVA_HOME/bin/:\$JRE_HOME/bin/" >> /etc/profile.d/java.sh # source /etc/profile.d/java.sh ``` ### Install Java with Alternatives After setting Environment Variables use Alternatives to install Java ``` # alternatives --install /usr/bin/java java $JAVA_HOME/bin/java 1 # alternatives --config java There are 3 programs which provide 'java'. Selection Command ----------------------------------------------- 1 /opt/jdk1.8.0_111/bin/java Enter to keep the current selection[+], or type selection number: 1 ``` At this point *Java 8* has been successfully installed on your system. **Note:** *If you performed this installation in a Development Server, we also recommend to setup javac and jar commands path using alternatives* ``` # alternatives --install /usr/bin/jar jar $JAVA_HOME/bin/jar 1 # alternatives --install /usr/bin/javac javac $JAVA_HOME/bin/javac 1 # alternatives --set jar $JAVA_HOME/bin/jar # alternatives --set javac $JAVA_HOME/bin/javac ``` ## Linux Debian & Ubuntu ## MacOS X ## Windows