ognl.NoConversionPossible

分别定义了楼层和房间两个类，其中，楼层和房间是双向的一对多关系，两个类的代码如下

package entity;
import java.util.Set;
/**
* 楼层
*
*/
public class Floor {
private String fid;//楼层编号
private String fdesc;//楼层描述
private Set<Room> rooms;//对多方的引用
public Floor()
{
}
public String getFid() {
return fid;
}
public void setFid(String fid) {
this.fid = fid;
}
public String getFdesc() {
return fdesc;
}
public void setFdesc(String fdesc) {
this.fdesc = fdesc;
}
public Set<Room> getRooms() {
return rooms;
}
public void setRooms(Set<Room> rooms) {
this.rooms = rooms;
}
@Override
public String toString() {
return fdesc;
}
}

package entity;
/**
* 房间
* @author user
*
*/
public class Room {
private String rid;//房间编号
private Floor floor;//所在楼层，对一方的引用
private String rdesc;//房间描述
public String getRid() {
return rid;
}
public void setRid(String rid) {
this.rid = rid;
}
public Floor getFloor() {
return floor;
}
public void setFloor(Floor floor) {
this.floor = floor;
}
public String getRdesc() {
return rdesc;
}
public void setRdesc(String rdesc) {
this.rdesc = rdesc;
}
@Override
public String toString() {
return "Room [rdesc=" + rdesc + "]";
}
}

由于是通过房间查找对应的楼层，打开房间类对应的对象关系映射文件

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!--
~ Hibernate, Relational Persistence for Idiomatic Java
~
~ License: GNU Lesser General Public License (LGPL), version 2.1 or later.
~ See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
-->
<hibernate-mapping >
<class name="entity.Room" table="room">
<id name="rid" type="string">
<generator class="assigned"></generator>
</id>
<property name="rdesc" type="string"/>
<many-to-one name="floor" class="entity.Floor" column="fid" ></many-to-one>
</class>
</hibernate-mapping>

最后

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