public ArbitraryAttributeMap getArbitraryAttributeMap() {
        return arbitraryAttributes;
    }
Returns a map of attribute name/value pairs for all attributes associated
with this model which do not have explicit mappings to actual model
properties. All other attributes (those which are explicitly supported
by the model) should instead be mapped to properties with corresponding
and properly-typed columns.

@return
    A map of attribute name/value pairs for all attributes associated
    with this model which do not otherwise have explicit mappings to
    properties.
extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-base/src/main/java/org/apache/guacamole/auth/jdbc/base/ObjectModel.java