我有@Stateless bean,它实现了两个接口(远程和本地).我还添加了@LocalBean anotation来访问带有无接口视图的bean.
@Stateless
@LocalBean
public class WeatherDataBean implements WeatherDataBeanRemote,WeatherDataBeanLocal {
@Inject
private EntityManager entityManager;
public WeatherDataBean () {
}
// ....attributes,getter & setter methods ....
}
我使用@Inject因为这个原因采取from this example of JBoss AS7 quickstart：
We use the “resource producer” pattern,from CDI,to “alias” the old fashioned @PersistenceContext injection of the entity manager to a CDI style injection. This allows us to use a consistent injection style (@Inject) throughout the application.
以前我用过：
@PersistenceContext(unitName="WeatherStationJPA") private EntityManager entityManager;
在EJB中,它没有任何问题.但是使用@Inject注释我得到这个错误：
WELD-001408 Unsatisfied dependencies for type [EntityManager] with
qualifiers [@Default] at injection point [[field] @Inject private
ejb.WeatherDataBean.entityManager]
这是我如何定义类资源：
public class Resources {
@SuppressWarnings("unused")
@PersistenceContext(unitName="WeatherStationJPA")
@Produces
private EntityManager entityManager;
@Produces
FacesContext getFacesContext() {
return FacesContext.getCurrentInstance();
}
}
如果我尝试注入实体管理器,为什么会出现此错误？
编辑：
根据@LightGuard的请求,我正在添加用于引用注释的包：
> WeatherDataBean有：
import javax.ejb.LocalBean; import javax.ejb.Stateless; import javax.inject.Inject;
>资源有：
import javax.enterprise.inject.Produces; import javax.faces.context.FacesContext; import javax.inject.Singleton; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext;
我只是遇到了同样的问题,我通过将这个类添加到我的项目中来解决这个问题
原文链接：https://www.f2er.com/javaschema/281533.htmlimport java.util.logging.Logger;
import javax.enterprise.context.RequestScoped;
import javax.enterprise.inject.Produces;
import javax.enterprise.inject.spi.InjectionPoint;
import javax.faces.context.FacesContext;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
/**
* This class uses CDI to alias Java EE resources,such as the persistence context,to CDI beans
*
* <p>
* Example injection on a managed bean field:
* </p>
*
* <pre>
* @Inject
* private EntityManager em;
* </pre>
*/
public class Resources {
// use @SuppressWarnings to tell IDE to ignore warnings about field not being referenced directly
@SuppressWarnings("unused")
@Produces
@PersistenceContext
private EntityManager em;
// @Produces
// public Logger produceLog(InjectionPoint injectionPoint) {
// return Logger.getLogger(injectionPoint.getMember().getDeclaringClass().getName());
// }
@Produces
@RequestScoped
public FacesContext produceFacesContext() {
return FacesContext.getCurrentInstance();
}
}
