public class Employee
{private Integer id;private String name;private String email;private int gender;private Department department;
}

public class Department
{private Integer id;private String departmentName;
}

<form:form action="input" method="POST" modelAttribute="employee">Name: <form:input path="name"/><br>Email: <form:input path="email"/><br><%Map<Integer, String> genders = new HashMap();genders.put(0, "Female");genders.put(1, "Male");request.setAttribute("genders", genders);%>Gender: <form:radiobuttons path="gender" items="${genders}"/><br><%-- jstl是支持级联属性的，在这里我想选择的部门id，则直接写Employee类中的department属性再".id"就可以了。而后面的itemLabel 属性和 itemValue 属性。就不用再加department这个前缀了。直接写Department类的属性名称即可。Department: <form:select path="department.id" items="${departments}" itemLabel="department.departmentName" itemValue="department.id"></form:select>--%>Department: <form:select path="department.id" items="${departments}" itemLabel="departmentName" itemValue="id"></form:select><br><input type="submit" name="Submit"><br></form:form>

org.apache.jasper.JasperException: An exception occurred processing JSP page /WEB-INF/views/input.jsp at line 3936:             Department: <form:select path="department.id" items="${departments}"
37:             itemLabel="department.departmentName" itemValue="department.id"></form:select>
38:         --%>
39:         Department: <form:select path="department.id" items="${departments}"
40:         itemLabel="department.departmentName" itemValue="department.id"></form:select>
41:         <br>
42:         <input type="submit" name="Submit">

org.springframework.beans.NotReadablePropertyException: Invalid property 'department' of bean class [com.zcd.ssh.beans.Department]: Bean property 'department' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?org.springframework.beans.AbstractNestablePropertyAccessor.getPropertyValue(AbstractNestablePropertyAccessor.java:633)org.springframework.beans.AbstractNestablePropertyAccessor.getNestedPropertyAccessor(AbstractNestablePropertyAccessor.java:850)org.springframework.beans.AbstractNestablePropertyAccessor.getPropertyAccessorForPropertyPath(AbstractNestablePropertyAccessor.java:827)org.springframework.beans.AbstractNestablePropertyAccessor.getPropertyValue(AbstractNestablePropertyAccessor.java:622)org.springframework.web.servlet.tags.form.OptionWriter.doRenderFromCollection(OptionWriter.java:202)org.springframework.web.servlet.tags.form.OptionWriter.renderFromCollection(OptionWriter.java:180)org.springframework.web.servlet.tags.form.OptionWriter.writeOptions(OptionWriter.java:133)