gert_1

Don't know if you tried this, but maybe you'haven't enabled page footer on summary page?
Enable like this:
Report -.> Properties Go to tab 'Report' Enable 'Summary With Page Header And Footer' Hope this does the trick..

Solved it, reference to: https://community.jaspersoft.com/questions/800720/how-access-property-expressions
Request a report propertie with following expression: $P{JASPER_REPORT}.getProperty("ireport.jasperserver.report.resource")
Then some concatenating to do but that's no showstopper. 
 
I am wondering though, where I can find all properties of the aJasper Report (ireport.jasperserver.xx.xx etc.)

You should 'register' functions in both jasperreports_extension.properties file and the jasperreports_messages.properties file that can be located in your custom function folder.
You'll need version 6.0.3 btw as well, before that version there was some trouble with those functions see http://community.jaspersoft.com/jaspersoft-studio/issues/3972
Rebooting sometimes fixes the problem in older versions. If it doesn't work, you can try to manipulate the excisting functions (change content etc. so it does what you want and then change is step by step; did help/learn me a lot ).
 
Good luck!

I think rick has a point, maybe better to use 2 different textfields, but that can be a pain as well if you want mulptiple different sizes in 1 line. It can be done like this:
Go to Text Field properteis -> Tab 'Text Field' Set 'Markup' (beneath 'Font') to 'html'  Now you can use HTML expressions in your text field to change font size like:
"This is normal text  <font size='5'>This is a different size text!</font>"

I think it is possible (will test it later on):
 
When you go to the report in JasperSoft Studio and go to the report properties -> Select  on "When No Data Type" "No Data Section"  instead of "No Pages".
After that, you add the band "No Data" and can enter any message you want to be shown when the report is empty.