Hi, We use jaspersoft studio 6.6.0 on windows 10 with oracle 12c database (ojdbc8.jar).
Frequently when trying to edit a report query it fails consistently (depending on query) with popup windows "Problem Occurred" with following message:
"An internal error occurred during: "XtextReconcilerJob"."
"java.lang.IllegalArgumentException: SelectQuery.op does not exist"
This only seems to happen with queries with combination of with clause and union as far as I can tell.
This can be reproduced with following simple example query on empty report (detail section no fields):
with data1 as (select 1 as value from dual),
data2 as (select 2 as value from dual)
select value from data1
select value from data2
For the rest the report seems to run fine with preview working and generated report (.jasper) working.
I have tested with version jaspersoft studio 6.6.0 on laptop, jaspersoft studio 6.16.0 on same laptop and reproduced issue on different machines with jaspersoft studio 6.6.0