Installing Java

Debian 10 and Elasticsearch 7.x

Just run

BASH

sudo apt install default-jdk

Check installed Java version with

BASH

java -version

Debian 8 and Elasticsearch 5.x

The desired version of OpenJDK is not available in out-of-the-box Debian Jessie. So you have to rely on Debian Backports repository and add the following lines to the end of your /etc/apt/sources.list file:

BASH

# jessie backports
deb http://http.debian.net/debian jessie-backports main

You can use the nano text editor:

BASH

nano /etc/apt/sources.list

The installation of version 8 is then straight forward:

BASH

apt-get update
apt-get install -t jessie-backports openjdk-8-jdk

You can also make Java 8 the default:

BASH

update-alternatives --config java

Links with more detailed information: