Moving from JDK 1.7 to JDK 1.8 on Ubuntu

I am on UBUNTU. JDK version currently installed is:

java version "1.7.0_51"
Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)

the configuration being installed is:

sudo update-alternatives --config java
There is only one alternative in link group java 
(providing /usr/bin/java):     /usr/lib/jvm/java-7-oracle/jre/bin/java

I downloaded the latest tar.gz archive of JDK 1.8.

How can I easily install JDK 1.8 from tar.gz overriding/uninstalling the JDK 1.7 currently installed? Or even without explicitly use the tar.gz.

This is what I do on debian - I suspect it should work on ubuntu (amend the version as required + adapt the folder where you want to copy the JDK files as you wish, I'm using /opt/jdk):

wget --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u71-b15/jdk-8u71-linux-x64.tar.gz
sudo mkdir /opt/jdk
sudo tar -zxf jdk-8u71-linux-x64.tar.gz -C /opt/jdk/
rm jdk-8u71-linux-x64.tar.gz

Then update-alternatives:

sudo update-alternatives --install /usr/bin/java java /opt/jdk/jdk1.8.0_71/bin/java 1
sudo update-alternatives --install /usr/bin/javac javac /opt/jdk/jdk1.8.0_71/bin/javac 1

Select the number corresponding to the /opt/jdk/jdk1.8.0_71/bin/java when running the following commands:

sudo update-alternatives --config java
sudo update-alternatives --config javac

Finally, verify that the correct version is selected:

java -version
javac -version

Just use these command lines:

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer

If needed, you can also follow this Ubuntu tutorial.

Add the repository and update apt-get:

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update

Install Java8 and set it as default:

sudo apt-get install oracle-java8-set-default

Check version:

java -version

You can easily install 1.8 via PPA. Which can be done by:

$ sudo add-apt-repository ppa:webupd8team/java
$ sudo apt-get update
$ sudo apt-get install oracle-java8-installer

Then check the running version:

$ java -version

If you must do it manually there's already an answer for that on AskUbuntu here.

You can do the following to install java 8 on your machine. First get the link of tar that you want to install. You can do this by:

> 1. go to java downloads page and find the appropriate download. > 2. Accept the license agreement and download it. > 3. In the download page in your browser right click and copy link address.

Then in your terminal:

$ cd /tmp
$ wget http://download.oracle.com/otn-pub/java/jdk/8u74-b02/jdk-8u74-linux-x64.tar.gz\?AuthParam\=1458001079_a6c78c74b34d63befd53037da604746c
$ tar xzf jdk-8u74-linux-x64.tar.gz?AuthParam=1458001079_a6c78c74b34d63befd53037da604746c
$ sudo mv jdk1.8.0_74 /opt
$ cd /opt/jdk1.8.0_74/
$ sudo update-alternatives --install /usr/bin/java java /opt/jdk1.8.0_91/bin/java 2
$ sudo update-alternatives --config java // select version
$ sudo update-alternatives --install /usr/bin/jar jar /opt/jdk1.8.0_91/bin/jar 2
$ sudo update-alternatives --install /usr/bin/javac javac /opt/jdk1.8.0_91/bin/javac 2
$ sudo update-alternatives --set jar /opt/jdk1.8.0_91/bin/jar
$ sudo update-alternatives --set javac /opt/jdk1.8.0_74/bin/javac
$ java -version // you should have the updated java

Most of the answers for this question can not helped me in 2020.

This notification from download site of Oracle may be the reason:

> Important Oracle JDK License Update

> The Oracle JDK License has changed for releases starting April 16, 2019.

I try to google a little bit and those tutorials below helped me a lot.

1. Remove completely the previous version of JVM installed on your PC.

   sudo update-alternatives --remove-all java
   sudo update-alternatives --remove-all javac
   sudo update-alternatives --remove-all javaws
   
   # /usr/lib/jvm/jdk1.7.0 is the path you installed the previous version of JVM on your PC
   sudo rm -rf /usr/lib/jvm/jdk1.7.0 
   

Check to see whether java is uninstalled or not bash java -version 2. Install Java 8 JDK.

• Download Java 8 from Oracle's website. The version being used is 1.8.0_251. Pay attention to this value, you may need it to edit commands in this answer when Java 8 is upgraded to another version.

• Extract the compressed file to the place where you want to install.

  cd /usr/lib/jvm
  sudo tar xzf ~/Downloads/jdk-8u251-linux-x64.tar.gz
  

• Edit environment file

  sudo gedit /etc/environment
  

• Edit the PATH's value by appending the string below to the current value

  :/usr/lib/jvm/jdk1.8.0_251/bin:/usr/lib/jvm/jdk1.8.0_251/jre/bin
  

• Append those strings to the environment file

  J2SDKDIR="/usr/lib/jvm/jdk1.8.0_251"
  J2REDIR="/usr/lib/jvm/jdk1.8.0_251/jre"
  JAVA_HOME="/usr/lib/jvm/jdk1.8.0_251"
  

• Complete the installation by running commands below

  sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.8.0_251/bin/java" 0
  sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk1.8.0_251/bin/javac" 0
  sudo update-alternatives --set java /usr/lib/jvm/jdk1.8.0_251/bin/java
  sudo update-alternatives --set javac /usr/lib/jvm/jdk1.8.0_251/bin/javac
  
  update-alternatives --list java
  update-alternatives --list javac