Java – hibernate – spring/bean mapping set

I'm pretty much a newb with spring-hibernate and I have been trying to make it work.

I have a data model like this:

patient                prescription
----------             --------------
patient_id*            prescription_id*
first_name             patient_id*
last_name              date
...

I'm using spring beans with hibernate template to define my session/hibernatetemplate and dao like this:

    <bean id="mySessionFactory"
    class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
    <property name="dataSource" ref="myDataSource" />
    <property name="mappingResources">
        <list>
            <value>./org/example/smartgwt/shared/model/prescription.hbm.xml</value>
            <value>./org/example/smartgwt/shared/model/patient.hbm.xml</value>
        </list>
    </property>
    <property name="hibernateProperties">
        <value>hibernate.dialect=org.hibernate.dialect.HSQLDialect</value>
    </property>
</bean>

<!-- Wrapper for low-level data accessing and manipulation -->
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
    <property name="sessionFactory">
        <ref bean="mySessionFactory" />
    </property>
</bean>

<!--  -->

<bean id="patientDao" class="org.example.smartgwt.server.data.PatientDao">
    <property name="hibernateTemplate">
        <ref bean="hibernateTemplate" />
    </property>
</bean>

<bean id="prescriptionDao" class="org.example.smartgwt.server.data.PrescriptionDao">
    <property name="hibernateTemplate">
        <ref bean="hibernateTemplate" />
    </property>
</bean>

For a while I had only patient table and all was ok. But then I decided to add a prescription which uses a foreign key of type patient_id. Basically I have 2 POJO model objects like this:

public class Patient implements Serializable {

///////////////////////////////////////////////////////////////////////////
// Data members
///////////////////////////////////////////////////////////////////////////
private static final long serialVersionUID = 1L;
private int    patientId;
private String firstName;
private String lastName;
private Date   birthDate;
private String address;
private String phone;

private Set patientPrescriptions;

public Patient() {}

public void setPatientId(int patientId) {
    this.patientId = patientId;
}

public int getPatientId() {
    return patientId;
}

public void setFirstName(String firstName) {
    this.firstName = firstName;
}

public String getFirstName() {
    return firstName;
}

public void setLastName(String lastName) {
    this.lastName = lastName;
}

public String getLastName() {
    return lastName;
}

public void setBirthDate(Date birthDate) {
    this.birthDate = birthDate;
}

public Date getBirthDate() {
    return birthDate;
}

public void setAddress(String address) {
    this.address = address;
}

public String getAddress() {
    return address;
}

public void setPhone(String phone) {
    this.phone = phone;
}

public String getPhone() {
    return phone;
}

public void setPatientPrescriptions(Set patientPrescriptions) {
    this.patientPrescriptions = patientPrescriptions;
}

public Set getPatientPrescriptions() {
    return patientPrescriptions;
}
}

(Similar simpler thing for Prescription).

The thing that is bugging me is the private Set patientPrescriptions member. Here is my hbm.xml mapping for my patient class.

<hibernate-mapping>
<class name="org.example.smartgwt.shared.model.Patient" table="patient" lazy="true">
    <id name="patientId" column="patient_id">
        <generator class="increment"/>
    </id>

    <property name="firstName">
        <column name="first_name"/>
    </property>
    <property name="lastName">
        <column name="last_name"/>
    </property>
    <property name="birthDate">
        <column name="birth_date"/>
    </property>
    <property name="address">
        <column name="address"/>
    </property>
    <property name="phone">
        <column name="phone"/>
    </property>

    <set name="patientPrescriptions" cascade="all">
        <key column="patient_id"/>
        <one-to-many class="Prescription"/>
    </set>

</class>

As soon as I reference that in my patient.hbm.xml mapping file I get an error.

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'prescriptionDao' defined in file [C:\eclipse\workspace\smart-gwt\WebContent\WEB-INF\resources\hibernate-beans.xml]: Cannot resolve reference to bean 'hibernateTemplate' while setting bean property 'hibernateTemplate'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hibernateTemplate' defined in file [C:\eclipse\workspace\smart-gwt\WebContent\WEB-INF\resources\hibernate-beans.xml]: Cannot resolve reference to bean 'mySessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mySessionFactory' defined in file [C:\eclipse\workspace\smart-gwt\WebContent\WEB-INF\resources\hibernate-beans.xml]: Invocation of init method failed; nested exception is org.hibernate.MappingException: Association references unmapped class: Prescription

Why do I get the unmapped error for this Set? If I remove that from my hbm.xml, I can do pretty my everything with my session. Is there something special to do while requesting the dao object? Here is the code I use to get my dao.

        Resource resource = new FileSystemResource("./hibernate-beans.xml");
        BeanFactory factory = new XmlBeanFactory(resource);
        PrescriptionDao prescriptionDao = (PrescriptionDao)factory.getBean("prescriptionDao");
        PatientDao clientDao = (PatientDao) factory.getBean("patientDao");

Thank you