$schemamarkup = get_post_meta(get_the_ID(), 'schemamarkup', true); if(!empty($schemamarkup)) { echo $schemamarkup; }

How to Install Java OpenJDK on Ubuntu Gnu/Linux Distro

GNU/Linux Ubuntu Installing Java OpenJDK Guide

Hi! The linked Tutorials Show you Step-by-Step How to Install Oracle-Sun Java OpenJDK JRE/JDK on Ubuntu GNU/Linux Distribution.

And the OpenJDK for Ubuntu (Open Java Development Kit) is a Free and Open Source Implementation of the Java Platform, Standard Edition (Java SE).

Oracle Java JDK/JRE Installation is based on the OpenJDK source code. In Addition, it contains Closed-Source Components.

As the best Alternative see: How to Install Oracle Official Java JDK on Linux Distros.

How to Install Java OpenJDK JRE/JDK on Ubuntu Linux- Featured

GNU/Linux Ubuntu Java OpenJDK Installation Guide