N.b. AuthFunctionBeans are NOT directly usable as HyperSQL Authentication
Function methods, they are POJO beans to be managed by AuthBeanMultiplexer
(which does have a real HyperSQL Authentication Function static method).
Blaine Simpson (blaine dot simpson at admc dot com)
Return a list of authorized roles or null to indicate that the
implementation does not intend to produce a specific role list but only
to indicate whether to allow access or not.
A return value of String is different from returning null, and means
that the user should not be granted any roles.
userName - String
password - String
null or String according to the contract of HyperSQL
authentication function contract, except that the role/schema
list is returned as a String instead of a java.sql.Array.
Exception - If user should not be allowed access to the specified
database. Other registered AuthFunctionBeans will not be attempted.
RuntimeException - Upon system problem. The exception will be
logged to the HyperSQL application logger and other registered
AuthFunctionBeans (if any) will be attempted.