Could you please provide the documentation for the JasperReports 7.9 as installed for WorldServer 11.7.x? It has not been provided together with the installer as it was the case in the past. 

From a WorldServer perspective, the Jasper Reports 7.9. documentation has been provided as part of the WorldServer 11.7. Release Notes, which you can find here.

If you click on the JasperReports Server 7.9 link in the Technology Update of the Release Notes, the TIBCO JasperReports® Server Release Notes will open up. In Chapter 4 (page 11) you will find this note:

As of version 7.9, JasperReports Server documentation will no longer be packaged with the product. The documentation is available at:

• http://community.jaspersoft.com/documentation
• https://docs.tibco.com/products/tibco-jasperreports-server

These articles are relevant:

WorldServer: where can I find the direct URL of the Jasper Report server?

WorldServer - How to Schedule a Report via Jasper Reports

WorldServer 11.7.x - not possible to schedule a report with Jasper Report version 7.9 - Menu Tabs are missing in the User Interface