Change character set of database then apex not working

[amrsamy]

Dear,

I have database 11.2.0.3.0 then I changed character set of database with these commands :

SHUTDOWN IMMEDIATE;
STARTUP MOUNT;
ALTER SYSTEM ENABLE RESTRICTED SESSION;
ALTER SYSTEM SET JOB_QUEUE_PROCESSES=0;
ALTER SYSTEM SET AQ_TM_PROCESSES=0;
ALTER DATABASE OPEN;
ALTER DATABASE CHARACTER SET INTERNAL_USE AL32UTF8;
ALTER DATABASE CHARACTER SET AL32UTF8;
SHUTDOWN IMMEDIATE;
STARTUP;


then when I start Listener  of apex and start the apex app I got this !!

https://www.mediafire.com/file/2gazch5639cyi46/apex.PNG

Please this so urgent and I have critical data on it.

[ErmanArslansOracleBlog]

What document did you follow for changing your db character set?

[amrsamy]

it was video on youtube ,, I know its wrong , I uninstalled apex and installed it again and it works , but all applications are removed.

[ErmanArslansOracleBlog]

Next time, follow Oracle support documents.. (especially when doing such a critical thing)

[amrsamy]

Sure , thanks for your concern :)