Oracle JDK8 installation on RHEL 7

JDK8_installation_RHEL.md

Download Oracle JDK 8

1. Visit Oracle JDK download page, look for RPM version.
2. Copy the rpm link and wget it

wget --header "Cookie: oraclelicense=accept-securebackup-cookie" Download link.rpm 

Note: Install wget if missing

sudo yum install wget -y

3. Install oracle jdk8

sudo yum localinstall jdk8 downloaded package name.rpm

4. Verfication

java -version

5. Delete the rpm file

rm ~/jdk8 downloaded package name.rpm 

6. Set Environment variables This is good practice to set the JAVA_HOME environment variable. 6.1 Edit the .bash_profile, and append the export JAVA_HOME at the end of the file, for example :

.bash_profile
# Get the aliases and functions
if [ -f ~/.bashrc ]; then
	. ~/.bashrc
fi

# User specific environment and startup programs

export JAVA_HOME=/usr/java/jdk1.8.0_102/
export JRE_HOME=/usr/java/jdk1.8.0_102/jre

PATH=$PATH:$HOME/bin:$JAVA_HOME/bin

export PATH

6.2 Test the $JAVA_HOME and $PATH

$ source .bash_profile

$ echo $JRE_HOME
/usr/java/jdk1.8.0_102/jre

$ echo $JAVA_HOME
/usr/java/jdk1.8.0_102/

$ echo $PATH
/...:/usr/local/bin:/usr/X11R6/bin:/home/mkyong/bin:/usr/java/jdk1.8.0_102//bin

7. If the RHEL has multiple JDK installed, you can use the alternatives command to set the default java

$ sudo alternatives --config java
[sudo] password for mkyong:

There are 2 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
   1           /usr/lib/jvm/jre-1.6.0-openjdk.x86_64/bin/java
*+ 2           /usr/java/jdk1.8.0_102/jre/bin/java

Enter to keep the current selection[+], or type selection number: