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

How to Install Apache Wicket on RHEL-based Distros

RHEL-based Installing Apache Wicket 8 – Step by step Guide

The Guide shows you Step-by-Step How to Install Apache Wicket 8.X Java Framework on RHEL-based GNU/Linux Distributions – Step by step Tutorial.

And Apache Wicket for CentOS is a Very Clean Java Framework that use Plain Java for implementing the Dynamic behavior and Plain HTML for maintaining like Layout.

Install Apache Wicket 8 on CentOS - Featured

GNU/Linux RHEL-based Apache Wicket Installation Guide