Question

我在项目中使用 Wildfly 和 graphql-java 。我在教程中设置了像they这样的GraphQL端点，它与虚拟数据完美配合。但我无法注入我在Bean内部的Repository连接到我的数据库。注入的变量始终为空。

有人可以帮助我并告诉我我做错了什么吗？

GraphQLEndpoint

@WebServlet(urlPatterns = "/graphql")
public class GraphQLEndpoint extends SimpleGraphQLServlet {

    @EJB()
    private static CountRepositoryInterface countRepository;

    public GraphQLEndpoint() {
        super(buildSchema());
    }

    private static GraphQLSchema buildSchema() {
        LinkRepository linkRepository = new LinkRepository(); // Dummy Data from ArrayList
        TraceRepository traceRepository = new TraceRepository(); // Dummy Data from ArrayList

        return SchemaParser.newParser()
                .file("schema.graphqls")
                .resolvers(new Query(linkRepository, traceRepository, countRepository))
                .build()
                .makeExecutableSchema();
    }
}

CountRepositoryInterface

@Remote
public interface CountRepositoryInterface {

    void createCounter(Counter counter);

    Counter getCounterByUser(String userName);

    void updateCounter(String userName);

    void deleteAllCounter();

    List<Counter> GetAllFromCounter();
}

CountRepository

@Stateless
public class CountRepository implements CountRepositoryInterface {

    @PersistenceContext(unitName = "count")
    private EntityManager entityManager;

    public void createCounter(Counter counter) {
        entityManager.persist(counter);
    }

    public List<Counter> GetAllFromCounter() {
        Query query = entityManager.createQuery("SELECT c FROM Counter c");

        return  query.getResultList();
    }

Answer 1

从“countRepository”和“buildSchema”中删除静态修饰符;
不要在构造函数中调用buildSchema，因为还不能进行注入，而是覆盖servlet的init（）方法;
如果您需要存储库是单例，请使用@Singleton声明它。

GraphQL Java：带有注入bean

1 个答案: