This article explain you how to install and configure Java JDK latest version on CentOS /RHEL servers. Here I am going to install latest Java JDK on CentOS 7 Version . Below is my CentOS Server information.
[[email protected]~]# cat /etc/redhat-release
CentOS Linux release 7.3.1611 (Core)
Downlod Java JDK Latest Version
Download latest Java SE Development Kit 8 from official Java vendor . Below are the steps for download the java and extract in temporary folder in linux.
For Linux x64 ( 64 Bit )
# cd /tmp
# curl -LO http://download.oracle.com/otn-pub/java/jdk/8u151-b12/e758a0de34e24606bca991d704f6dcbf/jdk-8u151-linux-x64.tar.gz -H --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie"
# tar xzf jdk-8u151-linux-x64.tar.gz
# mv jdk1.8.0_151 /opt
For Linux x86 ( 32 Bit )
# cd /tmp
# curl -LO http://download.oracle.com/otn-pub/java/jdk/8u151-b12/e758a0de34e24606bca991d704f6dcbf/jdk-8u151-linux-i586.tar.gz -H --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie"
# tar xzf jdk-8u151-linux-i586.tar.gz
# mv jdk1.8.0_151 /opt
Here we have –no-cookies and –header option with curl or wget because of oracle does not give download unless we have not accept their license or terms .for accept header and license use above syntax for download .
–no-cookies –header “Cookie: oraclelicense=accept-securebackup-cookie”
Install Java
Now we have got extracted folder of java (jdk1.8.0_71). Alternatives command is the best way to install java. Go to the extracted folder of java and run like below command as showing.
# cd /opt/jdk1.8.0_151
# alternatives --install /usr/bin/java java /opt/jdk1.8.0_151/bin/java 2
Now we should set jar and javac path .
# alternatives --install /usr/bin/jar jar /opt/jdk1.8.0_151/bin/jar 2
# alternatives --install /usr/bin/javac javac /opt/jdk1.8.0_151/bin/javac 2
# alternatives --set jar /opt/jdk1.8.0_151/bin/jar
# alternatives --set javac /opt/jdk1.8.0_151/bin/javac
Set Java Environment Variables :
After the set of javac and jre path , we will set the environment variables in linux . So many application needs to use the JAVA_Home or JRE_HOME environment variables for java executable to use, even you can not see java version without environment variables set.
To set java home variable use below command.
# export JAVA_HOME=/opt/jdk1.8.0_151
To set jre home variable use below command
# export JRE_HOME=/opt/jdk1.8.0_151/jre/
To set the path variables use below command
# export PATH=$PATH:/opt/jdk1.8.0_151/bin:/opt/jdk1.8.0_151/jre/bin
Verify Installed Java Version
Now check the version of installed java on linux box through below command
# java -version
java version "1.8.0_151"
Java(TM) SE Runtime Environment (build 1.8.0_151-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.151-b12, mixed mode)
If your java command not running after set the environment variables then add below lines in bashrc and profile files in /etc directory.
JAVA_HOME=/opt/jdk1.8.0_151/
export PATH=$JAVA_HOME/bin:$PATH
Congratulations, Now we have install , run and configure java !
