我正在尝试使用Wildfly和数据库连接创建一个EJB Web项目来保存我的类“Article”。但是,当我启动我的应用程序时,我收到错误
引起:org.jboss.weld.exceptions.DeploymentException:WELD-001408: 带有限定符@Default的ArticleDAO类型的不满意依赖项 在注入点[BackedAnnotatedField] @Inject private serrvices.Customer.dao at serrvices.Customer.dao(Customer.java:0)
此异常是由我的@Inject语句引起的,但我无法弄清楚问题出在哪里。我已经在网上搜索并在meta-inf文件夹中放置了一个beans.xml:
豆发现模式= “所有” >
但没有成功。以下是我的相关课程:
Customer.java
package serrvices;
import javax.ejb.EJB;
import javax.ejb.Stateless;
import javax.inject.Inject;
import javax.ws.rs.Consumes;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import beans.CustomerManager;
@Path("customer")
public class Customer {
@EJB
private CustomerManager manager;
/*
@GET
@Produces(MediaType.TEXT_HTML)
public String getCustomerCount() {
return "<h3>Customer Count: " + manager.getCustomerCount() + "</h3>";
}
*/
@Inject
private ArticleDAO dao;
@GET
//@Consumes({"application/xml", "application/json"})
public void insert()
{
ArticleDTO userr = new ArticleDTO(999,"XXX",99);
System.out.println("insert: " + userr);
dao.createArticle(userr.getDescription(), userr.getPrice());
}
}
ArticleDAO
包裹服务;
import java.util.List;
public interface ArticleDAO
{
Article insert(Article user);
Article update(Article user);
void delete(Article user);
Article findById(int id);
List<Article> findAll();
Article createArticle(String description, long price);
}
ArticleDAOImpl
package serrvices;
import java.util.List;
import javax.ejb.LocalBean;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
class ArticleDAOImpl
implements ArticleDAO
{
//private final Logger LOG = Logger.getLogger(ArticleDAOImpl.class);
@PersistenceContext
private EntityManager em;
/*
* CRUD Operations
*/
@Override
public Article insert(Article article)
{
System.out.println("insert(" + article + ")");
em.persist(article);
return article;
}
@Override
public Article update(Article article)
{
System.out.println("update(" + article + ")");
return em.merge(article);
}
@Override
public void delete(Article article)
{
System.out.println("delete(" + article + ")");
em.remove(article);
}
@Override
public Article findById(int id)
{
System.out.println("findById(" + id + ")");
return em.find(Article.class, id);
}
@SuppressWarnings("unchecked")
@Override
public List<Article> findAll()
{
System.out.println("findAll()");
final String hql = "SELECT u FROM " + Article.class.getName() + " AS u";
return em.createQuery(hql).getResultList();
}
/*
* Factory methods
*/
@Override
public Article createArticle(String description, long price)
{
System.out.println("createArticle(\"" + description + "\"," + price +")");
Article u = new Article();
u.setDescription(description);
u.setPrice(price);
insert(u);
return u;
}
}
答案 0 :(得分:1)
当CDI容器初始化bean并注入依赖项时,它只能将对象注入容器知道的其他对象,否则它将不会执行注入。您注射的类必须为容器所知。
尝试使用ArticleDAOImpl
和@Named
@ApplicationScoped
CLASS注释