Linux – [Solved] How to install Java 7/8 on Centos and Redhat 6/7
How to install Java 7 on Centos and Redhat 6/7
Downloading Latest Java Archive
Java latest archive is available on its official site. We recommend to download latest version of Java from Oracle official website. After completing download also extract archive with given commands.
we will download tar.gz file. You can also install with bin file.
For 64 Bit:-
# 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/7u79-b15/jdk-7u79-linux-x64.tar.gz" # tar xzf jdk-7u79-linux-x64.tar.gz
For 32 Bit:-
# 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/7u79-b15/jdk-7u79-linux-i586.tar.gz" # tar xzf jdk-7u79-linux-i586.tar.gz
Note: If Above wget command doesn’t not work for you. You can download from Official page and upload to your server by TFTP/FTP
Use archive file as per your system configuration. For this example we are using CentOS 7.0 (64 bit) system.
Install Java with Alternatives
After extracting Java archive file, we just need to set up to use newer version of Java using alternatives. Use the following commands to do it.
# cd /opt/jdk1.7.0_79/ # alternatives --install /usr/bin/java java /opt/jdk1.7.0_79/bin/java 2 # alternatives --config java
There are 3 programs which provide 'java'. Selection Command ----------------------------------------------- * 1 /opt/jdk1.7.0_60/bin/java + 2 /opt/jdk1.7.0_72/bin/java 3 /opt/jdk1.7.0_79/bin/java Enter to keep the current selection[+], or type selection number: 3 [Press Enter]
Now you may also required to set up javac and jar commands path using alternatives command.
# alternatives --install /usr/bin/jar jar /opt/jdk1.7.0_79/bin/jar 2 # alternatives --install /usr/bin/javac javac /opt/jdk1.7.0_79/bin/javac 2 # alternatives --set jar /opt/jdk1.7.0_79/bin/jar # alternatives --set javac /opt/jdk1.7.0_79/bin/javac
Check Installed Java Version
Use following command to check which version of Java is currently being used by system.
# java -version java version "1.7.0_79" Java(TM) SE Runtime Environment (build 1.7.0_79-b15) Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)
Configuring Environment Variables
Most of Java based application’s uses environment variables to work. Use following commands to set up these variable properly. It’s also good to add following commands to any start-up script like ~/.bashrc or ~/.bash_profile.
- Setup JAVA_HOME Variable
# export JAVA_HOME=/opt/jdk1.7.0_79
- Setup JRE_HOME Variable
# export JRE_HOME=/opt/jdk1.7.0_79/jre
- Setup PATH Variable
# export PATH=$PATH:/opt/jdk1.7.0_79/bin:/opt/jdk1.7.0_79/jre/bin
Note : IMPORTANT
You can config Environment Variables in file /etc/environment (with me, i used this way to make sure Java works well)
(open /etc/enviroment and add 3 lines
PATH=/usr/local/bin:/bin:/usr/bin:/sbin:/usr/sbin:.:/opt/jdk1.7.0_79/bin:/opt/jdk1.7.0_79/jre/bin) That's it. I hope you will be successful when you install java