EL表达式有关问题？如何获取对象的属性对象的属性对象的属性

EL表达式问题？怎么获取对象的属性对象的属性对象的属性？
1、SSH的小虾米不懂是否可以获取对象的属性对象的属性对象的属性？
2、不可以的 话 用ognl表达式可以吗？
求解谢谢大虾。

list.jsp

<table>
<tbody>
<tr>
<td>序号</td>
<td>工号</td>
<td>姓名</td>
<td>部门</td>
</tr>


<c:forEach items="${liveinfos }" var="liveinfo">
<tr>
<td>${liveinfo.live_id }</td>
<td>${liveinfo.employee.emp_no }</td>
<td>${liveinfo.employee.emp_name }</td>
<td>${liveinfo.employee.department.dep_name }</td>
</tr>

</c:forEach>
</tbody>
</table>

Employee.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
                                   "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.model">
<class name="cn.model.Employee" table="employee">
<cache include="all" region="cn.model.Employee" usage="read-write" />

<id type="integer" name="emp_id" column="emp_id">
<generator class="native" />
</id>
<property generated="never" length="200" name="emp_name"
not-null="true" type="string" />
<property generated="never" length="200" name="emp_no" type="string" />
<many-to-one name="depart" column="depart_id"></many-to-one>
</property>
<one-to-one name="liveinfo" />
</class>
</hibernate-mapping>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
                                   "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.model">
 <class name="cn.model.Department" table="department">
  <cache include="all" region="cn.model.Department" usage="read-write"/>

  <id type="integer" name="dep_id" column="dep_id"><generator class="identity" /></id>
  <property generated="never" length="200" name="dep_name" column="dep_name"  type="string"/>
  <property generated="never" length="200" name="dep_shortname" column="dep_shortname"   type="string"/>
  <set name="emp_set" >
  <key column="depart_id"></key>
  <one-to-many class="Employee" />
  </set>
  
  
 </class>
</hibernate-mapping>

action.java

public String list(){
ActionContext.getContext().put("liveinfos", liveinfoService.list());

return "list";
}

运行错误

org.apache.jasper.JasperException: An exception occurred processing JSP page /WEB-INF/page/liveinfoList.jsp at line 46 
 

43: <td>${liveinfo.live_id }</td>
44: <td>${liveinfo.employee.emp_no }</td>
45: <td>${liveinfo.employee.emp_name }</td>
46: <td>${liveinfo.employee.department.dep_name }</td>

String 类 Cache 编码
[解决办法]
你看看employee中的department对象有没get set方法哦
[解决办法]
employee内看不到department属性的配置，应该是<td>${liveinfo.employee.depart.dep_name }</td>吧

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