@Deprecated
    public static EmbeddedServer create(Object identifier,
                                        Routes routeMatcher,
                                        StaticFilesConfiguration staticFilesConfiguration,
                                        boolean multipleHandlers) {

        return create(identifier,
                      routeMatcher,
                      ExceptionMapper.getServletInstance(),
                      staticFilesConfiguration,
                      multipleHandlers);
    }
Holds and uses the factories for creating different Embedded servers.
src/main/java/spark/embeddedserver/EmbeddedServers.java