In previous versions of EAP we could use 'a' as admin password as there weren't any password restrictions, but now password must have at least 8 characters, at least one digit and at least one non-alphanumeric symbol.

Typical use-case of creating new password via add-user script for person who experienced previous versions is:

------------------------------------------------------------------
...
Enter the details of the new user to add.
Realm (ManagementRealm) : 
Username : a
Password : 

 * Error * 
JBAS015269: Password must have at least '8' characters!

Username (a) :       
Password : 

 * Error * 
JBAS015266: Password must have at least one digit.

Username (a) :     
Password : 

 * Error * 
JBAS015267: Password must have at least one non-alphanumeric symbol.

Username (a) :         
Password : 
Re-enter Password :
...
------------------------------------------------------------------

I believe that requirements for password should be revealed to user at once. Same issue is also for creating new user during installation via installer.