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This is the root cause of your issue.
    The apex pool in ORDS corresponds to the database APEX_PUBLIC_USER and it is not correctly configured.
    Connect to the SQL Plus prompt with SYS user and SYSDBA privileges and run the following query:
    
// select username  
    , account_status  
    , profile  
   from dba_users 
   where username in ('APEX_PUBLIC_USER','APEX_LISTENER','APEX_REST_PUBLIC_USER');  

 
    If the account status is LOCKED, EXPIRED, etc then unlock the user accounts for example:
    
// ALTER USER APEX_PUBLIC_USER IDENTIFIED BY <password> ACCOUNT UNLOCK;  
 
    Discard/delete the current ORDS configuration and re-configure ords.war/apex.war with correct passwords for     the users. Re-deploy it to Glassfish Server.