Hibernate错误：Unable to instantiate default tuplizer

Caused by: org.hibernate.HibernateException: Unable to instantiate default tuplizer [org.hibernate.tuple.entity.PojoEntityTuplizer]
    at org.hibernate.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:108)
    at org.hibernate.tuple.entity.EntityTuplizerFactory.constructDefaultTuplizer(EntityTuplizerFactory.java:133)
    at org.hibernate.tuple.entity.EntityEntityModeToTuplizerMapping.<init>

出错原因：  role 类文件中 roleprivileges  写成  roleprivilege   ,与  hibernate xml配置文件不对应  ；造成 hibernate无法加载创建role

public class role implements Serializable {
private  String roleid;
private String name;
private String state;
private Set<roleprivilege> roleprivileges;                     


public static String ROLE_STATE_VALID="1";
public static String ROLE_STATE_INVALID="0";


public String getRoleid() {
    return roleid;
}
public void setRoleid(String roleid) {
    this.roleid = roleid;
}
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public String getState() {
    return state;
}
public void setState(String state) {
    this.state = state;
}


public Set<roleprivilege> getRoleprivileges() {
    return roleprivileges;
}
public void setRoleprivileges(Set<roleprivilege> roleprivileges) {
    this.roleprivileges = roleprivileges;
}
public role() {

    // TODO Auto-generated constructor stub
}
public role(String roleid, String name, String state,
        Set<roleprivilege> roleprivileges) {
    super();
    this.roleid = roleid;
    this.name = name;
    this.state = state;
    this.roleprivileges = roleprivileges;
}






}

<hibernate-mapping>
    <class name="cn.itcast.nsfw.role.entity.role" table="role">
        <id name="roleid" type="java.lang.String">
            <column name="role_id" length="32" />
            <generator class="uuid.hex" />
        </id>
        <property name="name" type="java.lang.String">
            <column name="name" length="20" not-null="true" />
        </property>
        
        <property name="state" type="java.lang.String">
            <column name="state" length="1"  />
            
        </property>    
        
        
        <set name="roleprivileges"      inverse="true" lazy="false" cascade="save-update,delete">
        <key>
        <column name="role"></column>
        </key>
        <one-to-many  class="cn.itcast.nsfw.role.entity.roleprivilege"/> 
        
        </set>
    
        
        
    </class>
</hibernate-mapping>