So I just installed Ubuntu, and this is my first time working in a Linux environment, so bear with my noobishness here.
Anyway, I downloaded the Java 8 JDK directly from Oracle, but I understand there's also an OpenJDK for Java 8 as well. I have two questions.
What is the difference between the Oracle version and OpenJDK. Pros/Cons?
When I try and get OpenJDK 8, I can't. I'm pasting the terminal command and the error message I get here, hoping for advice. Again, very new to Linux, been on my first Linux distro ever for less than an hour here at this point.
user@computer:~/Java$ sudo apt-get install openjdk-8-jdk
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package openjdk-8-jdk
Any help would be appreciated. In the meantime, I'm just gonna use the Oracle package. Thanks.
Edit:
So, now I have a new problem. I installed OpenJDK 7, it came with Maven and just installed before I realized I was getting a two-for-one deal. Now I have JDK 7, and Eclipse, and Maven, and they're all working, but I'm stuck on JDK 7 rather than 8.
I saw that there's a link below, I intend to check it out in the morning, it's 2am and I'm tired right now. Any other advice for this new issue would be appreciated, otherwise I will definitely be checking out that link first thing in the morning.
I'm getting OpenJDK 8 from the official Debian repositories, rather than some random PPA or non-free Oracle binary. Here's how I did it:
sudo apt-get install debian-keyring debian-archive-keyring
Make /etc/apt/sources.list.d/debian-jessie-backports.list:
deb http://httpredir.debian.org/debian/ jessie-backports main
Make /etc/apt/preferences.d/debian-jessie-backports:
Package: *
Pin: release o=Debian,a=jessie-backports
Pin-Priority: -200
Then finally do the install:
sudo apt-get update
sudo apt-get -t jessie-backports install openjdk-8-jdk
As you can see I only have java 1.7 installed (on a Ubuntu 14.04 machine).
update-java-alternatives -l
java-1.7.0-openjdk-amd64 1071 /usr/lib/jvm/java-1.7.0-openjdk-amd64
To install Java 8, I did,
sudo add-apt-repository ppa:openjdk-r/ppa
sudo apt-get update
sudo apt-get install openjdk-8-jdk
Afterwards, now I have java 7 and 8,
update-java-alternatives -l
java-1.7.0-openjdk-amd64 1071 /usr/lib/jvm/java-1.7.0-openjdk-amd64
java-1.8.0-openjdk-amd64 1069 /usr/lib/jvm/java-1.8.0-openjdk-amd64
BONUS ADDED (how to switch between different versions)
sudo update-alternatives --config javaThere are 2 choices for the alternative java (providing /usr/bin/java). Selection Path Priority Status ------------------------------------------------------------ 0 /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java 1071 auto mode 1 /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java 1071 manual mode * 2 /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1069 manual mode Press enter to keep the current choice[*], or type selection number:
As you can see I'm running open jdk 8. To switch to to jdk 7, press 1 and hit the Enter key. Do the same for javac as well with, sudo update-alternatives --config javac.
Check versions to confirm the change: java -version and javac -version.
sudo apt-get update
sudo apt-get install openjdk-8-jdk
this should work
After adding the JDK repo, before Installing you might want to run an update first so the repo can be added
run
apt update
an then continue with your installation
sudo apt install adoptopenjdk-8-hotspot
I was having the same issue and tried all of the solutions on this page but none of them did the trick.
What finally worked was adding the universe repo to my repo list. To do that run the following command
sudo add-apt-repository universe
After running the above command I was able to run
sudo apt install openjdk-8-jre
without an issue and the package was installed.
Hope this helps someone.
Source: Stackoverflow.com