Moving from JDK 1 7 to JDK 1 8 on Ubuntu

Question

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

User · Answer

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.

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

java -version

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

User · Answer

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

User · Answer

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         go to java downloads page and find the appropriate download    Accept the license agreement and download it     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

User · Answer

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

User · Answer

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

User · Answer

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

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