@Deprecated
    public GraphqlServiceBuilder schema(GraphQLSchema schema) {
        checkState(graphql == null, "graphql() and schema() are mutually exclusive.");
        this.schema = requireNonNull(schema, "schema");
        return this;
    }
Sets the {@link GraphQLSchema}.

@deprecated Use {@link #graphql(GraphQL)} instead. Set the {@link GraphQLSchema} to a
            {@link GraphQL.Builder}.
graphql/src/main/java/com/linecorp/armeria/server/graphql/GraphqlServiceBuilder.java