public String toString() {
            return String.format(
                    "Graph [%s] configured at [%s] could not be instantiated and will not be available in Gremlin Server.  GraphFactory message: %s",
                    name, configurationFile, exception.getMessage());
        }
A {@link GraphManager} that will prevent Gremlin Server from starting if all configured graphs fail.
gremlin-server/src/main/java/org/apache/tinkerpop/gremlin/server/util/CheckedGraphManager.java