Hi @dizanlorenzi, login step (web) part should not be any problem as you can just use the web recorder.
Java J-Initiator part, you need to use desktop recorder (need to follow the step above for the fix first)
I am currently facing intermittent issue while generating the report in Opera, whereas the Report Form hang, i am still checking what will be the cause of this.
In overall, I will see UiPath works best in Windows/Web automation, however I dont see any major issue in using UiPath on Opera (Java based) as well. The good thing about this tool is that while waiting for the Opera J-Initiator fix in this forum, I managed to make some automation in Opera using Image automation as well.
Anyway I dont have experience using BP and AA, so nothing much I can compare against.