Java 为什么EJB是空的？
我正在研究rest服务，同时学习EJB。我只是使用简单的chain controller->service->DAO运行我的应用程序，我的EJB hotelService没有被注入——它是空的Java 为什么EJB是空的？,java,ejb,ejb-3.1,Java,Ejb,Ejb 3.1,我正在研究rest服务，同时学习EJB。我只是使用简单的chain controller->service->DAO运行我的应用程序，我的EJB hotelService没有被注入——它是空的 @Path("/hotels") public class HotelsController { @EJB private HotelService hotelService; @GET @Produces(MediaType.APPLICATION_JSON) public Response ge
@Path("/hotels")
public class HotelsController {
@EJB
private HotelService hotelService;
@GET
@Produces(MediaType.APPLICATION_JSON)
public Response getHotelsList(@QueryParam("startDate") String startDate,
@QueryParam("endDate") String endDate) {
List<HotelsEntity> list = hotelService.getAll();
return ResponseFactory.response(Response.Status.OK, list);
}
}
]]您需要实现一个@Local注释接口来表示该EJB bean的本地视图，或者需要将@LocalBean注释添加到HotelService类本身，以明确声明它是该EJB的本地无接口视图
@Stateless
@EJB(beanInterface = HotelService.class, name = "HotelService")
@LocalBean
public class HotelService {
// ...
}
如果您希望该服务在容器外部可用于RMI或EJB客户端执行，则需要创建该服务的@Local和@Remote视图，并同时实现这两个视图。谢谢您的回答，但这并没有帮助——我将其标记为LocalBean，但在阅读java ee 7文档之后，问题是相同的，我意识到实际上并不需要@LocalBean。您在启动时是否遇到其他错误？您检查过服务器日志了吗？是的，在启动时，我在这里描述了一个问题，我通过设置asadmin set configs.config.ser解决了这个问题
@Stateless
public class HotelDAO {
@PersistenceContext(unitName = Constants.PERSISTENCE_UNIT)
private EntityManager em;
public List<HotelsEntity> getAll() {
// TODO complete me
CriteriaBuilder builder = em.getCriteriaBuilder();
CriteriaQuery<HotelsEntity> criteria = builder.createQuery(HotelsEntity.class);
Root<HotelsEntity> root = criteria.from(HotelsEntity.class);
criteria.select(root);
TypedQuery<HotelsEntity> resultQuery = em.createQuery(criteria);
return resultQuery.getResultList();
}
<modelVersion>4.0.0</modelVersion>
<groupId>HospitalityRestServer</groupId>
<artifactId>HospitalityRestServer</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>HospitalityRestServer Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>4.3.5.Final</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.ws.rs</groupId>
<artifactId>javax.ws.rs-api</artifactId>
<version>2.0</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.core</groupId>
<artifactId>jersey-server</artifactId>
<version>2.7</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-json-jackson</artifactId>
<version>2.4</version>
</dependency>
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>annotations-api</artifactId>
<version>6.0.29</version>
</dependency>
<dependency>
<groupId>org.glassfish</groupId>
<artifactId>javax.ejb</artifactId>
<version>3.1</version>
</dependency>
</dependencies>
[2014-04-28T17:58:05.828+0400] [glassfish 4.0] [WARNING] [] [javax.enterprise.web]
tid: _ThreadID=22 _ThreadName=http-listener-1(4)] [timeMillis: 1398693485828] [levelValue: 900] [[
@Stateless
@EJB(beanInterface = HotelService.class, name = "HotelService")
@LocalBean
public class HotelService {
// ...
}