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Java JDK install

For Linux derivatives

Ubuntu

On Ubuntu, you can either choose the default OpenJdk or install the Oracle JDK through a additional software repository. The latter method is preferred. Starting with Ubuntu 14.04 both methods allow to install different JDK versions and let them co-exists on your system.

  1. Option 1: OpenJdk (maintained by canonical)

    OpenJdk versions 7 and 8 can be installed through the official repos starting Ubuntu trusty.

    $ sudo apt-get install openjdk-8-jdk

    To set the system wide default jdk, simply launch the update-alternatives command :

    $ sudo update-alternatives --config java

  2. Option 2: Oracle JDK (preferred - most compatible)

    The Oracle JDK is available through an external repo.

    $ sudo apt-get install python-software-properties
$ sudo add-apt-repository ppa:webupd8team/java
$ sudo apt-get update
$ sudo apt-get install oracle-java8-installer

    To set the system wide default jdk, simply install the oracle-javaX-set-default package, where X stands for the version you need.

    $ sudo apt-get install oracle-java8-set-default

Redhat / Centos

On redhat systems,

  1. Option 1: OpenJdk

    OpenJdk versions 6 and 7 can be installed through the official redhat repos

    $ yum install java-1.7.0-openjdk-devel

    See also this question.

  2. Options 2 : Oracle JDK

    For Redhat subscribed users, you can refer to this solution.