If you are hitting this weird problem when trying to login to your APEX app running on Oracle ADB 23ai:
Item ID (P9999_USERNAME) is not an item defined on the current page.
According to Oracle APEX development team members this seems to be related to an issue with the database result cache mechanism that can be fixed by executing this procedure as SYSDBA (ADMIN user on ADB):
begin dbms_result_cache.flush; end;You can find the whole story about the problem on this forum thread.
Now, I am not completely clear if this problem was fixed at some point and then popped up again on a more recent version of Oracle 23ai, in my case ADB is version 23.9.0.25.08 and APEX has been recently upgraded to 24.2.8.
I am glad I quickly found the workaround this morning as it was really driving me crazy.
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