Java org.hibernate.LazyInitializationException-无法初始化代理-没有会话设置属性

我刚刚在设置POJO spring 2+Hibernate JPA+MySQL DB的属性时遇到以下异常错误：

 org.hibernate.LazyInitializationException: could not initialize proxy - no Session at     org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:167) at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:215) at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:190) at com.confloorapp.domain.Floor_$$_javassist_0.setNumberOfEvents(Floor_$$_javassist_0.java) at com.ifloor.services.endpoint.UpdateFloorEventServlet.doGet(UpdateFloorEventServlet.java:59) at javax.servlet.http.HttpServlet.service(HttpServlet.java:617) at javax.servlet.http.HttpServlet.service(HttpServlet.java:723) at ...

这是一套：

floor.setNumberOfEvents    ((Long)numOfEvents);

这就是POJO：

@Entity @Table(name="T_FLOOR") public class Floor {
@Id
@Column(name = "FLOOR_ID", unique = true, nullable = false)
private Integer id;
@Column(name = "FLOOR_KEY")
private String floorKey;
@Column(name = "NUMBER_OF_EVENTS")
private Long numberOfEvents;

public Integer getId() {
return id;
}
public void setId(Integer id) {
    this.id = id;
}
public Long getNumberOfEvents() {
    return numberOfEvents;
}
public void setNumberOfEvents(Long numberOfEvents) {
    this.numberOfEvents = numberOfEvents;
}
public String getFloorKey() {
    return floorKey;
}
public void setFloorKey(String floorKey) {
    this.floorKey = floorKey;
}       
}

这就是MYSQL表定义：

mySQL

---

提示：始终更改会话所在DAO层中的实体对象。对其他地方的实体对象进行更改将引发上述异常；floor.setNumberOfEvents LongnumOfEvents；floorService.save或更新floor；您正在尝试更新代理。尝试在dao层中调用session.get。我已经在dao层中获得了会话：@Resourcename=sessionFactory private sessionFactory sessionFactory；

  CREATE TABLE `T_FLOOR` (
  `FLOOR_ID` int(11) NOT NULL AUTO_INCREMENT,
  `FLOOR_KEY` varchar(45) DEFAULT NULL,
  `FLOOR_DESC` varchar(45) DEFAULT NULL,
  `LOCATION_ID` int(11) DEFAULT NULL,
  `NUMBER_OF_EVENTS` bigint(20) DEFAULT NULL,
  `LAST_EVENT` timestamp NULL DEFAULT NULL,
  `LAST_UPDATE` timestamp NULL DEFAULT NULL,
  `LATITUDE` float DEFAULT NULL,
  `LONGITUDE` float DEFAULT NULL,
   PRIMARY KEY (`FLOOR_ID`),
   UNIQUE KEY `FLOOR_ID_UNIQUE` (`FLOOR_ID`),
   KEY `FK_floor_location` (`LOCATION_ID`),
    CONSTRAINT `FK_door_location` FOREIGN KEY (`LOCATION_ID`) REFERENCES `T_LOCATION` (`LOCATION_ID`)