1. How to change the server port
2. How to troubleshoot the FOP requests
3. Oracle APEX specific issues

1. How to change the server port

The default port for the server is 8087. If you want to change it, you have to edit this file:

<Installationdirectory>/etc/jetty.xml

change this line:

<Property name="jetty.port" default="8087" />

and restart the server

2. How to troubleshoot the FOP requests

Add the DEBUG=ON parameter in the URL, for example

http://computername:8087/J4LFOPServer/servlet?TEMPLATE=xslfo_filename&DEBUG=ON

or for Apex

http://computername:8087/J4LFOPServer/Apex?DEBUG=ON

this will print your requests in the server window. You will there see, the xsfl-fo file being used and the XML data received: