Most everything we want to do other than the base functionality of the computer is going to require a Java Development Kit (JDK). Let’s go through the quick and easy install.
1. Download
Find the latest version of the JDK using:
sudo yum list java\*-openjdk.x86_64
Pick the latest one and install both the base and developer version to ensure we’re getting the latest compiler version as well:
sudo yum -y install java-1.8.0-openjdk java-1.8.0-openjdk-devel
2. Configure Java
We need to set the default JDK to use:
sudo /usr/sbin/alternatives --config java
Make sure you have the latest one selected, if not, enter that number:
# There are 2 programs which provide 'java'.
#
# Selection Command
# -----------------------------------------------
# *+ 1 java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.131-2.b11.el7_3.x86_64/jre/bin/java)
# 2 java-1.7.0-openjdk.x86_64 (/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.131-2.6.9.0.el7_3.x86_64/jre/bin/java)
3. Configure Javac
Annoyingly, tConfigure the default Java compiler
sudo /usr/sbin/alternatives --config javac
Make sure you have the version that matches your selection for Java:
# There is 1 program that provides 'javac'.
#
# Selection Command
# -----------------------------------------------
# *+ 1 java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.131-2.b11.el7_3.x86_64/bin/javac)
4. Check
Check your versions:
$ java -version
# openjdk version "1.8.0_131"
# OpenJDK Runtime Environment (build 1.8.0_131-b11)
# OpenJDK 64-Bit Server VM (build 25.131-b11, mixed mode)
$ javac -version
# javac 1.8.0_131
5. Set Environment Vars
Set your JAVA_HOME and JRE_HOME:
echo -e "\n## JAVA VARS -------------------- " >> ~/.bashrc
echo "export JAVA_HOME=/usr/lib/jvm/jre-1.8.0-openjdk" >> ~/.bashrc
echo "export JRE_HOME=/usr/lib/jvm/jre" >> ~/.bashrc
# source it
. ~/.bashrc
Check your vars:
echo $JAVA_HOME
echo $JRE_HOME