Oracle Database 12c was released on June 25, 2013.
This page was last updated on 8-Jul-2013.
"ORA-65050: Common DDLs only allowed in CDB$ROOT". Additionally, using
apxremov_con.sqlwill leave some references to public synonyms. However, this will not prevent you from re-installing Application Express back into the container database.
apxremov_con.sqlthat is distributed in the
$ORACLE_HOME/apexdirectory. However, the required
apxrtins_con.sqlscripts to reinstall Application Express 4.2.2 into the multitenant container database were not originally within the zip files for Application Express 4.2.2.