Manual JDK Installation on Linux

Manual JDK Installation on Linux

You may install JDK with sudo apt-get install command, but in this case you don't control which exactly version will be installed.

If you need specific version (for example, "jdk1.8.0_144") - it's better to install it manually.

Here are simple steps for this:

1. Download JDK version you need from the official web site: https://www.oracle.com/technetwork/java/javase/downloads/index.html
2. Unpack it (for example, to /opt/java folder)
3. Create symbolic links for java (and also for Java compiler -javac, and Java Web Start - javaws):

Go to /usr/bin folder:

cd /usr/bin/

Check if there are already sym links:

ls -al | grep java

Remove old symbolic links (if they exist):

sudo rm -Rf java
sudo rm -Rf javac
sudo rm -Rf javaws

Create new symbolic links to required Java version:

sudo ln -s /opt/java/jdk1.8.0_144/bin/java java 
sudo ln -s /opt/java/jdk1.8.0_144/bin/javac javac 
sudo ln -s /opt/java/jdk1.8.0_144/bin/javaws javaws

4. Check java version (in new terminal), sample:

 lifedev@solutions:~$ java -version
 java version "1.8.0_144"
 Java(TM) SE Runtime Environment (build 1.8.0_144-b01)
 Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)

5. Set the JAVA_HOME environment variable: edit file "/etc/environment" and add line:

 JAVA_HOME="/opt/java/jdk1.8.0_144"

Run command:   source /etc/environment

Check JAVA_HOME environment variable:

echo $JAVA_HOME