public Map<String, Connection> getConnections() {
        return connections == null ? null : Collections.unmodifiableMap(connections);
    }
Returns all connections stored within this UserData object as an
unmodifiable map. Each of these connections is accessible by the user
specified by getUsername(). The key of each entry within the map is the
identifier and human-readable name of the corresponding connection.

@return
    An unmodifiable map of all connections stored within this
    UserData object, where the key of each entry is the identifier of
    the corresponding connection.
extensions/guacamole-auth-json/src/main/java/org/apache/guacamole/auth/json/user/UserData.java