Attaching graphql-java to sparkjava

bp3_graphql_server.java

    private Map<String, Object> graphql(Request request, Response response) {
        Map<String, Object> payload;
        payload = getMapper().readValue(request.body(), Map.class);
        Map<String,Object> variables = (Map<String, Object>) payload.get("variables");
        ExecutionResult executionResult = graphql.execute(payload.get("query").toString(), null, null, variables);
        Map<String, Object> result = new LinkedHashMap<>();
        if (executionResult.getErrors().size() > 0) {
            result.put("errors", executionResult.getErrors());
        }
        result.put("data", executionResult.getData());
        response.type("application/json");
        return result;
    }