private List<StartupFailure> getStartupFailures() {
        if (startupFailures == null) {
            startupFailures = new ArrayList<>();
        }
        return startupFailures;
    }
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