As stated in this thread...
...I'd like to request the support of PDF/A-2 (3 wouldn't harm either), especially since this is supported in iText since version 5.4.5:
This is nothing nice to have for our company since it is required for us to conform to certain external specifications / standards.
Sorry, if this may have been implemented in the meantime, but I couldn't find instructions about it. Also, some of the properties you mentioned in your PDF/A-1 tutorial...
... are not chosable from the combobox in Jaspersoft Studio (I am using the latest plugin version). BTW: the property list would be more useful if it would be sorted alphabetically.