Installing Oracle JDK on RHEL-based Systems

Steps for installing the Oracle JDK on RHEL-based Systems.

1. Check which version of the JDK your system is using:

   java -version

   If Oracle Java is used, the results should look like:

   java version "1.8.0_65"
   Java(TM) SE Runtime Environment (build 1.8.0_65-b17)
   Java HotSpot(TM) 64-Bit Server VM (build 25.65-b01, mixed mode)

2. If necessary, go to Oracle Java SE Downloads, accept the license agreement, and download the installer for your distribution.
   Note: If installing the Oracle JDK in a cloud environment, accept the license agreement, download the installer to your local client, and then use scp (secure copy) to transfer the file to your cloud machines.
3. From the directory where you downloaded the package, run the install:

   sudo rpm -ivh jdk-8uversion-linux-x64.rpm

   The RPM installs the JDK into the /usr/java/ directory.

4. Set your system to use the Oracle JDK:

   sudo alternatives --install /usr/bin/java java /usr/java/jdk1.8.0_version/bin/java 200000

5. Use the alternatives command to switch to the Oracle JDK.

   sudo alternatives --config jav

   Note: If you have trouble, you may need to set JAVA_HOME and PATH in your profile, such as .bash_profile.

   The following examples assume that the JDK is in /usr/java and which java shows /usr/bin/java:

   • Shell or bash:

     export JAVA_HOME=/usr/java/latest
     $ export PATH=$JAVA_HOME/bin:$PATH

   • C shell (csh):

     setenv JAVA_HOME "/usr/java/latest"
     $ setenv PATH $JAVA_HOME/bin:$PATH

6. Make sure your system is using the correct JDK:

   java -version

   java version "1.8.0_65"
   Java(TM) SE Runtime Environment (build 1.8.0_65-b17)
   Java HotSpot(TM) 64-Bit Server VM (build 25.65-b01, mixed mode)