DITA documents are published with DITA Open Toolkit V1.4 that requires installation of Java not older than J2SE v 1.4.2_08. For instructions, see Installing Java on Windows and Installing Java on Linux.
By default, Serna is integrated with Antenna House XSL Formatter V4 for DITA documents. If you have a version of Antenna House XSL Formatter other than V4, follow these instructions.
In Serna, choose .
In the Publish Dialog, select PDF(with AH) from the Publishing output drop-down list.
Click the Generate button.

When the script ends, click the View button to view the published document.