Skip to content

Latest commit

 

History

History
75 lines (49 loc) · 3.18 KB

java.md

File metadata and controls

75 lines (49 loc) · 3.18 KB

Installing Java 8 on an Ubuntu Machine

To install Java on my machines, I had to do it manually. I couldn't get the various apt-get methods to work. (The automated attempt to download the JDK from Oracle's website would fail each time).

32-bit libraries (optional)

The 32-bit binary versions of the JDK require that various 32-bit libraries are present on the virtual machine. If you're virtual machine is a 64-bit operating system, those libraries may not be present. If you decide to use the 32-bit version of the JDK, then to make sure that the required libraries are present, run the following command:

sudo apt-get install libc6-i386

Download the JDK

  1. Head to <http://www.oracle.com/technetwork/index.html>
  2. Click on Software Downloads
  3. Click on Jave SE
  4. Click on the Download button for the JDK
  5. Click on the button that has you agree to the license agreement.
  6. Click on the link for Linux x86.
  7. After it downloads, use scp to copy it to your Ubuntu VM

The version I downloaded in July 2015 was: jdk-8u51-linux-x64.tar.gz (64 bit) and jdk-8u51-linux-i586.tar.gz (32 bit). Although I downloaded both, I ended up using just the 64 bit version.

Install the JDK (manually)

These manual instructions were taken from this useful post on Ask Ubuntu.

  1. Unpack the archive in a user directory: tar xzf <jdk-archive.tar.gz>

  2. Move the new directory to /usr/lib/jvm

     sudo mkdir -p /usr/lib/jvm
 sudo mv ./<jdk-archive> /usr/lib/jvm/

  3. Create a generic symlink for JDK 1.8

     cd /usr/lib/jvm
 sudo ln -s <jdk-directory> jdk1.8.0

  4. Let Ubuntu know about the newly installed commands. (Do this for any JDK command that you want to use.)

     sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.8.0/bin/java" 1
 sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk1.8.0/bin/javac" 1
 sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/lib/jvm/jdk1.8.0/bin/javaws" 1
 sudo update-alternatives --install "/usr/bin/jps" "jps" "/usr/lib/jvm/jdk1.8.0/bin/jps" 1
 sudo update-alternatives --install "/usr/bin/jar" "jar" "/usr/lib/jvm/jdk1.8.0/bin/jar" 1

  5. Mark the files as exectuable and make sure that root owns the installation

     sudo chmod a+x /usr/bin/java
 sudo chmod a+x /usr/bin/javac
 sudo chmod a+x /usr/bin/javaws
 sudo chmod a+x /usr/bin/jps
 sudo chmod a+x /usr/bin/jar
 sudo chown -R root:root /usr/lib/jvm/<jdk-directory>

  6. If you have only one version of the JDK installed, skip this step. Otherwise, pick the JDK you want to use

     sudo update-alternatives --config java
 sudo update-alternatives --config javac
 sudo update-alternatives --config javaws
 sudo update-alternatives --config jps
 sudo update-alternatives --config jar

  7. Make sure that JAVA_HOME is defined in /etc/environment. Add this line:

     JAVA_HOME="/usr/lib/jvm/jdk1.8.0"

  8. Test that everything is working

     java -version
 javac -version

  9. There is no step 9.