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Installing Java

Debian 10 and Elasticsearch 7.x

Just run

sudo apt install default-jdk

Check installed Java version with

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: 

# jessie backports
deb jessie-backports main

You can use the nano text editor:

nano /etc/apt/sources.list

The installation of version 8 is then straight forward:

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

You can also make Java 8 the default:

update-alternatives --config java

Links with more detailed information:

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