ejb中session bean 如何本地调用entity bean(一定给分）

    
        
            HelloTest
            test8012.HelloTestHome
            test8012.HelloTestRemote
            test8012.HelloTest
            Stateless
            Container
            
            
                
                ejb/gy_device
                Entity
                test8012.GyDeviceHome
                test8012.GyDevice
                GyDevice
            
            
                
                ejb/gy_province
                Entity
                test8012.GyProvinceHome
                test8012.GyProvince
                GyProvince
            
         
        
//本地调用
private  GyDeviceHome getGyDeviceHome()
  {
    Context ctx = null;
    try
    {
      System.out.println("查找 gy_device entity bean！");
      ctx = new  InitialContext();
      Object ref = ctx.lookup("java:comp/env/ejb/gy_device");
      System.out.println("查找结束");
      return  (GyDeviceHome)ref;
    }
    catch (Exception E)
    {
      throw  new   EJBException(E.getMessage());
    }
    finally
    {
       try
       {
         if  (ctx != null)
         {
            ctx.close();
         }
       }
       catch (Exception ex)
       {
          throw   new   EJBException(ex.getMessage());
       }
    }
  }