struts2中action 用domain类接收jsp参数该domain类没有初始化，求解

jsp代码
<body>
<s:form action="action_adds" namespace="/employee">
客户名称：<s:textfield name="employee.employeename" />
客户描述: <s:textfield name="employee.describe" />
<input type="submit" value="提交" />
</s:form>

</body>
action层代码：
private Employee employee;
private String message;

public String addUI() {
return "add";
}
public String adds() {
System.out.println(getParameter("employee.employeename"));
//employeeService.add(employee);
System.out.println(employee.getEmployeename());
message = "添加成功！";
return "message";
}
public Employee getEmployee() {
return employee;
}

public void setEmployee(Employee employee) {
System.out.println("调用setEmployee方法");
this.employee = employee;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}

domain类代码：
public class Employee {
private Integer employeeid;
private String employeename;
private String describe;
private String phone;
private String email;
private String loginname;
private String password;

private Department department;
public Employee() {
System.out.println("调用Employee构造方法");
}
public Department getDepartment() {
return department;
}
public void setDepartment(Department department) {
this.department = department;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getLoginname() {
return loginname;
}
public void setLoginname(String loginname) {
this.loginname = loginname;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}

public Integer getEmployeeid() {
return employeeid;
}
public void setEmployeeid(Integer employeeid) {
this.employeeid = employeeid;
}
public String getEmployeename() {
return employeename;
}
public void setEmployeename(String employeename) {
System.out.println("调用setEmployeename方法");
this.employeename = employeename;
}
public String getDescribe() {
return describe;
}
public void setDescribe(String describe) {
this.describe = describe;
}
Employee中有一个成员变量department 很关键
这是另外一个domain类。问题是如果把Employee中的这个department成员变量去掉，action层可以将jsp中的参数封装到Employee对象中，如果不去掉department成员变量，employee报空指针异常，求哪位大神帮着看看

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struts2中action 用domain类接收jsp参数 该domain类没有初始化，求解

struts2中action 用domain类接收jsp参数该domain类没有初始化，求解