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Often Linux distribution packages have JVM pre-installed.
It is recommended to install the latest version of Oracle JDK (Java Development Kit), because JDK has a set of useful diagnostics tools that JVM doesn't have.
You have to download installation package or archive for the JDK installation from oracle.com.
At the time of writing this documentation installation packages for different Linux distribution packages were available via this link: Java SE Development Kit 8 Downloads
Universal package, that suits for all Linux distribution packages, is jdk-8u25-linux-x64.tar.gz archive.
#Unpacking the archive
JDK installation is completed
Figure above shows how server with installed JVM / JDK looks like. Turn your attention to the string: 64-Bit Server VM. Java works in 64-bit mode using server settings.