dpossas/how-to-install-java-on-raspbian.md

## how-to-install-java-on-raspbian.md

      
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              how-to-install-java-on-raspbian.md
            
          
    Introduction

The default version of java provided in the latest raspbian images are outdated, so we are going to install from the ppa:webupd8team/java repository instead. Please note that add-apt-repository ppa:webupd8team/java will not work, so we will need to add the repository manually.
Installation


Create the gpg key file and paste the following lines of text below

nano key.txt

-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: SKS 1.1.5
Comment: Hostname: keyserver.ubuntu.com
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=CziK
-----END PGP PUBLIC KEY BLOCK-----


Add the gpg key

sudo apt-key add key.txt


Add the repository to /etc/apt/sources.list.d/ and perform an update

echo "deb http://ppa.launchpad.net/webupd8team/java/ubuntu xenial main" | sudo tee /etc/apt/sources.list.d/webupd8team-java.list
echo "deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu xenial main" | sudo tee -a /etc/apt/sources.list.d/webupd8team-java.list
sudo apt-get update

Install Java 8 SDK

sudo apt-get install oracle-java8-installer 

Verify that we have successfully installed java

pi@raspberrypi:~# java -version
java version "1.8.0_161"
Java(TM) SE Runtime Environment (build 1.8.0_161-b12)
Java HotSpot(TM) Client VM (build 25.161-b12, mixed mode)

Switching between versions

If you have multiple jvms installed and you want to switch back to a specific version of java you can do the following:
Option 1


List the available versions in your system

update-java-alternatives -l

Copy the key of the first column of the result of your target version

java-8-oracle                  1081       /usr/lib/jvm/java-8-oracle

Execute the set command using the previously copied key

update-java-alternatives -s java-8-oracle
Option 2

sudo apt-get install oracle-java8-set-default
More details here