#28951

> The pd4ml class will open and show my simple html file when I press GO.

It is a good sign. It means PD4ML works and renders HTML (in the case not to PDF, but to Image output device). I guess it also produces PDF to a TMP directory, but it cannot start a viewer application for some reason.

The problem with Tomcat still has no good explanation. I would recommend to try to configure a progress monitor:
http://pd4ml.com/cookbook/html_pdf_conversion_progress_monitoring.htm

It should help us to determine at which conversion phase it fails.