日期:2014-05-20  浏览次数:20729 次

调用EJB3 sessionBean的方法调用返回实体对象时,对象的属性都是null
如题。
项目都部署在Glassfish里,ejb和web是分开的两个项目。实体类是TUser,有默认的构造方法、其他的构造方法和get、set方法。
sessionBean
Java code

package serviceimpl;

import java.util.List;
import java.util.logging.Level;

import javax.ejb.Local;
import javax.ejb.Remote;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;

import service.TUserFacadeLocal;
import service.TUserFacadeRemote;
import util.LogUtil;

import entitys.TUser;

@Stateless(mappedName="TUserFacadeBean")
@Remote(TUserFacadeRemote.class)
@Local(TUserFacadeLocal.class)
public class TUserFacadeBean implements TUserFacadeLocal, TUserFacadeRemote {
@PersistenceContext
    private EntityManager entityManager;

    public TUser findById(Integer id) {
        LogUtil.log("finding TUser instance with id: " + id, Level.INFO, null);
        try {
            TUser instance = entityManager.find(TUser.class, id);
            LogUtil.log("findById userName " + instance.getUserName(), Level.INFO, null);
            return instance;
        } catch (RuntimeException re) {
            LogUtil.log("find failed", Level.SEVERE, re);
            throw re;
        }
    }
}


在web的项目里用的是JSF2.1,使用spring查找sessionBean
Java code

public class UserBean implements Serializable {
    private TUserFacade userService;

    public void setUserService(TUserFacade userService) {
        this.userService = userService;
    }

    public void findUser(int id){
        TUser user = userService.findById(id);
        LogUtil.log("userName: " + user.getUserName(), Level.INFO, null);
    }
    

    public List<TUser> getAll() {
        return userService.findAll(0, 10);
    }
    

    public static void main(String[] args) {
        System.out.println("begin");
        Properties props = new Properties();  
                props.setProperty("java.naming.factory.initial",  "com.sun.enterprise.naming.SerialInitContextFactory");  
               props.setProperty("java.naming.factory.url.pkgs", "com.sun.enterprise.naming");  
                props.setProperty("java.naming.factory.state", "com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl");  
                props.setProperty("org.omg.CORBA.ORBInitialHost", "localhost");  
                props.setProperty("org.omg.CORBA.ORBInitialPort", "3700");  
        try {
            InitialContext ctx = new InitialContext(props);
            TUserFacade helloWorld = (TUserFacade) ctx.lookup("TUserFacadeBean");
            TUser user = helloWorld.findById(1);
            System.out.println(user.getUserName());
        } catch (NamingException e) {
            e.printStackTrace();
        }
    }

}


XML code

<jee:remote-slsb id="userServiceRemote" business-interface="service.TUserFacade" jndi-name="TUserFacadeBean"></jee:remote-slsb>
     <bean id="userBean" class="backbean.UserBean" scope="session">
        <property name="userService" ref="userServiceRemote"/>
    </bean>


单独运行UserBean,在控制台会显示user.getUserName()的值。
但是在xhml里,使用el表达式调用findUser方法,在日志文件里可以看到TUserFacadeBean里的findById方法显示的user对象的值,但是在UserBean的调用得到的user.getUserName()是null。不知道这是为什么,希望各位不吝赐教,多谢多谢!

------解决方案--------------------
输出一下UserBean的toString,看看地址是不是一样的。

是不是在EJB这边的对象没有传到你的web层去,而在web层里面是一个新new的对象。