Java Hibernate 4.3映射文件错误

我犯了一个错误；然而，我不明白为什么会出现这个错误。第一个

class

元素没有给出任何错误，但是第二个

class

元素给出了错误。（注意：我有其他映射，但这是相同错误的重复，所以我不担心放入整个文件）

元素类型“类”的内容必须匹配

“（元*、子选择？、缓存？、同步*、注释？、元组化*、（id |复合id）、鉴别器？、自然id？、（版本|时间戳？）、（属性|多对一|一对一|组件|动态组件|属性|任意|映射|集|列表|包| idbag |数组|基元数组），（（联接，子类*）|联接子类*），加载程序？，sql插入？，sql更新？，sql删除？，过滤器*，结果集*，（查询| sql查询）*）

如有任何帮助，将不胜感激：

代码

主键

设置后放置连接标记零件

<class name = "cdd.model.User" table = "app_user">
    <id name = "userID" column = "user_id" type = "org.hibernate.type.PostgresUUIDType">
        <generator class="org.hibernate.id.UUIDGenerator"/>
    </id>

    <property name = "email" column = "email" type = "org.hibernate.type.TextType"/>  
    <property name = "fullName" column = "full_name" type = "org.hibernate.type.TextType"/>
    <property name = "passwordHash" column = "password_hash" type = "org.hibernate.type.TextType"/>
    <property name = "centre" column = "centre" type = "org.hibernate.type.TextType"/>
    <property name = "accessLevel" column = "access_level" type = "org.hibernate.type.IntegerType"/>

 <set name="acceptedQuestions" table="accepted_questions_by_user">
        <key column="user_id"/>
        <many-to-many column="question_id"
                      unique="true"
                      class="cdd.model.Question"/>
 </set>
</class>
<class name = "cdd.model.Category" table ="category" > 

    <id name ="categoryID" column = "category_id" type = "org.hibernate.type.PostgresUUIDType">
        <generator class = "org.hibernate.id.UUIDGenerator" />
    </id>

    <property name = "title" column = "title" type = "org.hibernate.type.TextType"/>
    <property name = "description" column = "description" type = "org.hibernate.type.TextType" />

    <set name = "questions" table = "category_questions" cascade = "all"  inverse = "true">
        <key column = "category_id" not-null = "true" />
        <one-to-many class = "cdd.model.Question"/> 
    </set>

    <join table = "category" >
        <key column = "category_id"/>
        <many-to-one name="category" column = "category_id" not-null = "true"/>
    </join>

</class>

---

设置后放置连接标记零件

<class name = "cdd.model.User" table = "app_user">
    <id name = "userID" column = "user_id" type = "org.hibernate.type.PostgresUUIDType">
        <generator class="org.hibernate.id.UUIDGenerator"/>
    </id>

    <property name = "email" column = "email" type = "org.hibernate.type.TextType"/>  
    <property name = "fullName" column = "full_name" type = "org.hibernate.type.TextType"/>
    <property name = "passwordHash" column = "password_hash" type = "org.hibernate.type.TextType"/>
    <property name = "centre" column = "centre" type = "org.hibernate.type.TextType"/>
    <property name = "accessLevel" column = "access_level" type = "org.hibernate.type.IntegerType"/>

 <set name="acceptedQuestions" table="accepted_questions_by_user">
        <key column="user_id"/>
        <many-to-many column="question_id"
                      unique="true"
                      class="cdd.model.Question"/>
 </set>
</class>
<class name = "cdd.model.Category" table ="category" > 

    <id name ="categoryID" column = "category_id" type = "org.hibernate.type.PostgresUUIDType">
        <generator class = "org.hibernate.id.UUIDGenerator" />
    </id>

    <property name = "title" column = "title" type = "org.hibernate.type.TextType"/>
    <property name = "description" column = "description" type = "org.hibernate.type.TextType" />

    <set name = "questions" table = "category_questions" cascade = "all"  inverse = "true">
        <key column = "category_id" not-null = "true" />
        <one-to-many class = "cdd.model.Question"/> 
    </set>

    <join table = "category" >
        <key column = "category_id"/>
        <many-to-one name="category" column = "category_id" not-null = "true"/>
    </join>

</class>

嘿，你能帮我查一下吗？也许你能帮我查一下吗？也许你能帮我查一下