How Install java and Set Environment Variables RHEL / CentOS
This article we illustrate how to install Java Development Kit 8 on RHEL/CentOS 7.0 version. As I am using 64 bit machine I would using 64 bit version of jdk. Below installation steps should work on other RPM based distributions such as RHEL 6.x, and Fedora etc. OpenJDK 7 is used as the default JDK version on RHEL/CentOS 7.0.
Note : This is our old article but updated with new version of jdk
| JRE Family Version | JRE Security Baseline (Full Version String) |
|---|---|
| 8 | 1.8.0_11 |
| 7 | 1.7.0_65 |
| 6 | 1.6.0_81 |
| 5.0 | 1.5.0_71 |
# cat /etc/redhat-release CentOS Linux release 7.0.1406 (Core)
Step 1) Download Java JDK / JRE 8u11
You can download Java SE Development Kit 8 from the Oracle download page for your specific OS and then upload to the server. Here I have used wget command to download the jdk-8u11-linux-x64.rpm file.
# wget http://download.oracle.com/otn-pub/java/jdk/8u11-b12/jdk-8u11-linux-x64.rpm # ls jdk-8u11-linux-x64.rpm
Step 2) Install Java 8u11
Here I am first uninstalling the previous version before I go for 8u11 version. It's up to you to decide whether to keep both versions.
# rpm -qa | grep -i jdk jdk-1.8.0_05-fcs.x86_64 # rpm -evh jdk-1.8.0_05-fcs.x86_64 Preparing... ################################# [100%] Cleaning up / removing... 1:jdk-2000:1.8.0_05-fcs ################################# [100%]
## rpm -Uvh jdk-8u11-linux-x64.rpm Preparing... ################################# [100%] Updating / installing... 1:jdk-2000:1.8.0_11-fcs ################################# [100%] Unpacking JAR files... rt.jar... jsse.jar... charsets.jar... tools.jar... localedata.jar... jfxrt.jar...
Alternatives
Alternatives is a tool for managing different software packages that provide the same functionality. Linux uses alternatives to ensure that only one Java Development Kit (JDK) is set as default at a time.
te># gunzip /usr/local/jdk-8u11-linux-x64.gz # tar -xvf jdk-8u11-linux-x64 # cd /usr/local/ # alternatives --install /usr/bin/java java /usr/local/jdk1.8.0_11/bin/java 3
This will assign Oracle JDK a priority of 3. You can give Oracle JDK the higher priority if you want it to remain the default.
# alternatives --config java There are 2 programs which provide 'java'. Selection Command ----------------------------------------------- *+ 1 /usr/local/jdk1.7.0_65/bin/java 2 /usr/local/jdk1.8.0_11/bin/java Enter to keep the current selection[+], or type selection number: 2
Step 3) Check Version of Java
# java -version java version "1.8.0_11" Java(TM) SE Runtime Environment (build 1.8.0_11-b12) Java HotSpot(TM) 64-Bit Server VM (build 25.11-b03, mixed mode)
Step 4) Setup Environment Variables
# ls /usr/java/jdk1.8.0_11/ bin javafx-src.zip man THIRDPARTYLICENSEREADME-JAVAFX.txt COPYRIGHT jre README.html THIRDPARTYLICENSEREADME.txt db lib release include LICENSE src.zip # ls /usr/java/jdk1.8.0_11/jre/ bin lib plugin THIRDPARTYLICENSEREADME-JAVAFX.txt Welcome.html COPYRIGHT LICENSE README THIRDPARTYLICENSEREADME.txt
Set for single user
If you are root user edit .bash_profile of the specific user (example in /home/bobbin/.bash_profile) or login with user account. And add below lines to the file. You replace the jdk version path depending on your installation.
##Setting Java Home
export JAVA_HOME=/usr/java/jdk1.8.0_11/
##Setting JRE Home
export JRE_HOME=/usr/java/jdk1.8.0_11/jre
##Export PATH Variable for JAVA Home and JRE Home
export PATH=$PATH:/usr/java/jdk1.7.0_65/bin:/usr/java/jdk1.8.0_11/jre/bin
or
export PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
Set globally or all users
To set globally you need set java path in /etc/profile file. Append below lines into the file
export PATH=$PATH:/usr/java/jdk1.8.0_11/bin
You need run source /etc/profile command to see the changes immediately or you need to logout & login.
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