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

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

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

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

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

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

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