Running
Copysudo apt update
before trying to install a second JDK (g00se suggested I had to) helped. It was ChatGPT's advice. If you need to know where the JDK is installed, try (also GPT's idea)
Copyupdate-alternatives --list java
With that information, you should be able to register that JAVA_HOME thing. In my case, it was
Copyexport JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64
I hope it helps somebody one day
Answer from Sergey Zolotarev on Stack OverflowIf i try to install using sudo apt-get install openjdk i get unable to locate package openjdk and if i try to add a repo i get the error in the photo so i cant install java using this repo i found in a tutorial
UPDATE: installation without root privileges below
I advise you to not install packages manually on ubuntu system if there is already a (semi-official) repository able to solve your problem. Further, use Oracle JDK for development, just to avoid (very sporadic) compatibility issues (i've tried many years ago, it's surely better now).
Add the webupd8 repo to your system:
Copysudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
Install your preferred version of jdk (versions from java-6 to java-9 available):
Copysudo apt-get install oracle-java8-installer
You can also install multiple version of jdk, mixing openjdk and oracle versions. Then you can use the command update-java-alternatives to switch between installed version:
Copy# list available jdk
update-java-alternatives --list
# use jdk7
sudo update-java-alternatives --set java-7-oracle
# use jdk8
sudo update-java-alternatives --set java-8-oracle
Requirements
If you get add-apt-repository: command not found be sure to have software-properties-common installed:
Copysudo apt-get install software-properties-common
If you're using an older version Ubuntu:
Copysudo apt-get install python-software-properties
JDK installation without root privileges
If you haven't administrator rights on your target machine your simplest bet is to use sdkman to install the zulu certified openjdk:
Copycurl -s "https://get.sdkman.io" | bash
source "$HOME/.sdkman/bin/sdkman-init.sh"
sdk install java
NOTE: sdkman allow to install also the official Oracle JDK, although it's not a the default option. View available versions with:
Copysdk ls java
Install the chosen version with:
Copysdk install java <version>
For example:
Copysdk install java 9.0.1-oracle
Glossary of commands
sudo
<command> [command_arguments]: execute a command with the superuser privilege.add-apt-repository
<PPA_id>: Ubuntu (just like every Debian derivatives and generally speaking every Linux distribution) has a main repository of packages that handle things like package dependencies and updating. In Ubuntu is possible to extend the main repository using a PPA (Personal Package Archive) that usually contains packages not available in the system (just like oracle jdk) or updated versions of available ones (example: LibreOffice 5 in LTS is available only through this PPA).apt-get
[install|update|upgrade|purge|...]: it's "the" command-line package handler used to manipulate the state of every repository on the system (installing / updating / upgrading can be viewed as an alteration of the repository current state).
In our case: with the command sudo add-apt-repository ppa:webupd8team/java we inform the system that the next repository update must retrieve packages information also from webupd8 repo.
With sudo apt-get update we actually update the system repository (all this operations requires superuser privileges, so we prepend sudo to the commands).
sudo apt-get install oracle-java8-installer
update-java-alternatives (a specific java version of update-alternatives): in Ubuntu several packages provides the same functionality (browse the internet, compile mails, edit a text file or provides java/javac executables...). To allows the system to choose the user favourites tool given a specific task a mechanism using symlinks under
/etc/alternatives/is used. Try to update the jdk as indicated above (switch between java 7 and java 8) and view how change the output of this command:ls -l /etc/alternatives/java*
In our case: sudo update-java-alternatives --set java-8-oracle update symlinks under /etc/alternatives to point to java-8-oracle executables.
Extras:
man
<command>: start using man to read a really well written and detailed help on (almost) every shell command and its options (every command i mention in this little answer has a man page, tryman update-java-alternatives).apt-cache
search <search_key>: query the APT cache to search for a package related with the search_key provided (can be the package name or some word in package description).apt-cache
show <package>: provides APT information for a specific package (package version, installed or not, description).
As you can see I only have java 1.7 installed (on a Ubuntu 14.04 machine).
Copyupdate-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,
Copysudo 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,
Copyupdate-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)
- run the follwing command from the terminal:
sudo update-alternatives --config javaCopyThere 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.
I run Debian 12 and thought of installing jdk21, then by misstake wrote jdk17 and in the process messed something up when deleting jdk17. so no I have no JDK and when trying to install jdk17 I first get:
sudo apt-get install openjdk-17-jdk Reading package lists... Done Building dependency tree... Done Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: openjdk-17-jre-headless : Depends: java-common (>= 0.28) but it is not installable E: Unable to correct problems, you have held broken packages.
I then try sudo apt-get install openjdk-17-jre-headless and get:
The following packages have unmet dependencies: openjdk-17-jre-headless : Depends: java-common (>= 0.28) but it is not installable E: Unable to correct problems, you have held broken packages.
I then try this: sudo apt-get install java-common and get:
E: Package 'java-common' has no installation candidate
My sources.d file look like this:
deb http://deb.debian.org/debian bookworm main contrib non-free non-free-firmware deb-src http://deb.debian.org/debian bookworm main contrib non-free non-free-firmware deb http://security.debian.org/debian-security bookworm-security main contrib non-free non-free-firmware deb-src http://security.debian.org/debian-security bookworm-security main contrib non-free non-free-firmware deb http://deb.debian.org/debian bookworm-updates main contrib non-free non-free-firmware deb-src http://deb.debian.org/debian bookworm-updates main contrib non-free non-free-firmware
What should I do to resolve this?
[17-08-2022] thank to @nobody (see comment to the question)
For all older version use this link:
https://launchpad.net/~openjdk-r/+archive/ubuntu/ppa
sudo add-apt-repository ppa:openjdk-r/ppa
sudo apt update
and select your version:
sudo apt install openjdk-15-jdk
It gives no openjdk-15-jdk in the repos from ubuntu :)
sudo apt list | grep openjdk [sudo] Passwort für k3ops: WARNING: apt does not have a stable CLI interface. Use with caution in scripts. openjdk-11-dbg/focal-updates,focal-security 11.0.9.1+1-0ubuntu1~20.04 amd64 openjdk-11-dbg/focal-updates,focal-security 11.0.9.1+1-0ubuntu1~20.04 i386 openjdk-11-demo/focal-updates 11.0.9.1+1-0ubuntu1~20.04 amd64 openjdk-11-demo/focal-updates,focal-security 11.0.9.1+1-0ubuntu1~20.04 i386 openjdk-11-doc/focal-updates,focal-updates,focal-security,focal-security 11.0.9.1+1-0ubuntu1~20.04 all openjdk-11-jdk-headless/focal-updates,focal-security 11.0.9.1+1-0ubuntu1~20.04 amd64 openjdk-11-jdk-headless/focal-updates,focal-security 11.0.9.1+1-0ubuntu1~20.04 i386 openjdk-11-jdk/focal-updates,focal-security 11.0.9.1+1-0ubuntu1~20.04 amd64 openjdk-11-jdk/focal-updates,focal-security 11.0.9.1+1-0ubuntu1~20.04 i386 openjdk-11-jre-dcevm/focal 11.0.3+1-1 amd64 openjdk-11-jre-headless/focal-updates,focal-security 11.0.9.1+1-0ubuntu1~20.04 amd64 openjdk-11-jre-headless/focal-updates,focal-security 11.0.9.1+1-0ubuntu1~20.04 i386 openjdk-11-jre-zero/focal-updates 11.0.9.1+1-0ubuntu1~20.04 amd64 openjdk-11-jre-zero/focal-updates,focal-security 11.0.9.1+1-0ubuntu1~20.04 i386 openjdk-11-jre/focal-updates,focal-security 11.0.9.1+1-0ubuntu1~20.04 amd64 openjdk-11-jre/focal-updates,focal-security 11.0.9.1+1-0ubuntu1~20.04 i386 openjdk-11-source/focal-updates,focal-updates,focal-security,focal-security 11.0.9.1+1-0ubuntu1~20.04 all openjdk-13-dbg/focal-updates 13.0.4+8-1~20.04 amd64 openjdk-13-dbg/focal-updates 13.0.4+8-1~20.04 i386 openjdk-13-demo/focal-updates 13.0.4+8-1~20.04 amd64 openjdk-13-demo/focal-updates 13.0.4+8-1~20.04 i386 openjdk-13-doc/focal-updates,focal-updates 13.0.4+8-1~20.04 all openjdk-13-jdk-headless/focal-updates 13.0.4+8-1~20.04 amd64 openjdk-13-jdk-headless/focal-updates 13.0.4+8-1~20.04 i386 openjdk-13-jdk/focal-updates 13.0.4+8-1~20.04 amd64 openjdk-13-jdk/focal-updates 13.0.4+8-1~20.04 i386 openjdk-13-jre-headless/focal-updates 13.0.4+8-1~20.04 amd64 openjdk-13-jre-headless/focal-updates 13.0.4+8-1~20.04 i386 openjdk-13-jre-zero/focal-updates 13.0.4+8-1~20.04 amd64 openjdk-13-jre-zero/focal-updates 13.0.4+8-1~20.04 i386 openjdk-13-jre/focal-updates 13.0.4+8-1~20.04 amd64 openjdk-13-jre/focal-updates 13.0.4+8-1~20.04 i386 openjdk-13-source/focal-updates,focal-updates 13.0.4+8-1~20.04 all openjdk-14-dbg/focal-updates 14.0.2+12-1~20.04 amd64 openjdk-14-dbg/focal-updates 14.0.2+12-1~20.04 i386 openjdk-14-demo/focal-updates 14.0.2+12-1~20.04 amd64 openjdk-14-demo/focal-updates 14.0.2+12-1~20.04 i386 openjdk-14-doc/focal-updates,focal-updates 14.0.2+12-1~20.04 all openjdk-14-jdk-headless/focal-updates 14.0.2+12-1~20.04 amd64 openjdk-14-jdk-headless/focal-updates 14.0.2+12-1~20.04 i386 openjdk-14-jdk/focal-updates 14.0.2+12-1~20.04 amd64 openjdk-14-jdk/focal-updates 14.0.2+12-1~20.04 i386 openjdk-14-jre-headless/focal-updates 14.0.2+12-1~20.04 amd64 openjdk-14-jre-headless/focal-updates 14.0.2+12-1~20.04 i386 openjdk-14-jre-zero/focal-updates 14.0.2+12-1~20.04 amd64 openjdk-14-jre-zero/focal-updates 14.0.2+12-1~20.04 i386 openjdk-14-jre/focal-updates 14.0.2+12-1~20.04 amd64 openjdk-14-jre/focal-updates 14.0.2+12-1~20.04 i386 openjdk-14-source/focal-updates,focal-updates 14.0.2+12-1~20.04 all openjdk-8-dbg/focal-updates 8u275-b01-0ubuntu1~20.04 amd64 openjdk-8-dbg/focal-updates,focal-security 8u275-b01-0ubuntu1~20.04 i386 openjdk-8-demo/focal-updates 8u275-b01-0ubuntu1~20.04 amd64 openjdk-8-demo/focal-updates,focal-security 8u275-b01-0ubuntu1~20.04 i386 openjdk-8-doc/focal-updates,focal-updates,focal-security 8u275-b01-0ubuntu1~20.04 all openjdk-8-jdk-headless/focal-updates 8u275-b01-0ubuntu1~20.04 amd64 openjdk-8-jdk-headless/focal-updates,focal-security 8u275-b01-0ubuntu1~20.04 i386 openjdk-8-jdk/focal-updates 8u275-b01-0ubuntu1~20.04 amd64 openjdk-8-jdk/focal-updates,focal-security 8u275-b01-0ubuntu1~20.04 i386 openjdk-8-jre-headless/focal-updates 8u275-b01-0ubuntu1~20.04 amd64 openjdk-8-jre-headless/focal-updates,focal-security 8u275-b01-0ubuntu1~20.04 i386 openjdk-8-jre-zero/focal-updates 8u275-b01-0ubuntu1~20.04 amd64 openjdk-8-jre-zero/focal-updates,focal-security 8u275-b01-0ubuntu1~20.04 i386 openjdk-8-jre/focal-updates 8u275-b01-0ubuntu1~20.04 amd64 openjdk-8-jre/focal-updates,focal-security 8u275-b01-0ubuntu1~20.04 i386 openjdk-8-source/focal-updates,focal-updates,focal-security 8u275-b01-0ubuntu1~20.04 all uwsgi-plugin-jvm-openjdk-11/focal 2.0.18-11ubuntu1 amd64 uwsgi-plugin-jwsgi-openjdk-11/focal 2.0.18-11ubuntu1 amd64 uwsgi-plugin-ring-openjdk-11/focal 2.0.18-11ubuntu1 amd64 uwsgi-plugin-servlet-openjdk-11/focal 2.0.18-11ubuntu1 amd64
Ups better you use "apt search openjdk" for the correct command, the first is bad code :P
apt can’t locate openjdk-16-jre-headless because the OpenJDK 16 packages aren’t available in any Debian release.
The only release available to you in Debian 10 is OpenJDK 11. Debian 11 has OpenJDK 17. Both of these are releases with long-term support.
openjdk-16-jre-headless isn't packaged on Debian. You have to use openjdk-11-jre-headless, it can be installed after enabling the security repository.
Java and debian.