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I started getting errors on my pi from running a java program that should run on java 8, which i thought i had on my pi, so i did java -version on my pi and it turns out I have java 7 installed (java version "1.7.0_131"). Any idea how to use java 8 on it?

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You can install oracle java8 jdk following this guide:

  1. modify /etc/apt/sources.list file

    sudo nano /etc/apt/sources.list
    

    adding this lines:

    deb http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main 
    deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main
    
  2. install jdk

    sudo apt-get update
    sudo apt-get install oracle-java8-installer
    
  3. verify installation

    java -version
    

    output should be:

    java version "1.8.0_131"
    
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Oops... I did some digging and found that you can do "sudo update-alternatives --config java", and select the number corresponding to java 8. It will probably have jdk8 in its path.

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