java - 注释类型的属性值未定义为 “MediaType.APPLICATION_JSON”产生

对于这个非常简单的静态服务代码，我得到了一个奇怪的警告(将鼠标悬停在eclipse中的红线处):
(Eclipse在“MediaType.APPLICATION_JSON”下画了一条红线)

import java.util.List;
import java.util.logging.Logger;

import javax.enterprise.inject.Produces;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;

import javax.ws.rs.core.MediaType;
import javax.ws.rs.GET;
import javax.ws.rs.Path;

import com.myCompany.annotation.RestfulServiceAddress;
import com.myCompany.myProject.middleware.api.myService;

@RestfulServiceAddress("/myCompany-middleware")
public class myServiceImpl implements myService {

private EntityManagerFactory entityManagerFactory;

@GET
@Path("/getStuff")
@Produces(MediaType.APPLICATION_JSON)
public List<Object> getStuff() {
    EntityManager entityManager = entityManagerFactory
            .createEntityManager();
    try {
        return entityManager.createQuery(
                "Select S from Stuff S", Object.class)
                .getResultList();
    } catch (Exception ex) {
        ex.printStackTrace();
        return null;
    } finally {
        entityManager.close();
    }
}

public EntityManagerFactory getEntityManagerFactory() {
    return entityManagerFactory;
}

public void setEntityManagerFactory(
        EntityManagerFactory entityManagerFactory) {
    this.entityManagerFactory = entityManagerFactory;
}
}

而且，maven可以毫无问题地构建jar文件。但是我从OSGI容器中收到一个错误，告诉我jar失败了。

最佳答案

使用 @javax.ws.rs.Produces 而不是javax.enterprise.inject.Produces

import javax.ws.rs.Produces;
// import javax.enterprise.inject.Produces;