How to list known users on Apache Derby server?

In the documentation to Apache Derby I've seen documentation on functions to administrate user accounts. However, I did not manage to find documentation on how to get a listing of all registered users. After failing to find a respective answer on a Web search likewise I tried all methods suggested by perplexity.ai, which just failed altogether:

SELECT * FROM SYS.SYSUSERS

> "Table/View 'SYS.SYSUSERS' does not exist."

SHOW ROLES

> "Syntax error: Encountered "SHOW" at line 1, column 1." and

SELECT * FROM SYS.SYSCS_UTIL.SYSCS_GET_ALL_PROPERTIES()
WHERE PROPERTY_NAME LIKE 'derby.user.%'

> "Syntax error: Encountered "." at line 1, column 29.". There is **no** derby.properties file either. How can I get a listing of all known users?