<class name="Book" schema="AAAA" table="BOOK">
      <id name="id" column="ID" type="java.lang.Long">
            <generator class="sequence">
                <param name="sequence">s_global_id</param>
            </generator>
        </id>
   <property name="title" type="java.lang.String" column="TITLE" />
   </class>

    <class name="Person" schema="AAAA" table="PERSON">
        <id name="id" column="ID" type="java.lang.Long">
            <generator class="sequence">
                <param name="sequence">s_global_id</param>
            </generator>
        </id>
        <joined-subclass name="Teacher"  schema="AAAA" table="TEACHER">
            <key column="ID"/>
            <list name="books" table="TEACHER_BOOK" fetch="select" cascade="all">
                <key column="TEACHER_ID" />
                <list-index column="INDX" base="0"/>
                <many-to-many  column="BOOK_ID" class="Book" fetch="select" />
            </list>
        </joined-subclass>
    </class>

class Book {
   Long id;
   
   String title;

   public Long getId() {
      return id;
   }

   public void setId(Long id) {
      this.id = id;
   }

   public String getTitle() {
      return title;
   }

   public void setTitle(String title) {
      this.title = title;
   }
}

class Person {
   Long id;
   public Long getId() {
      return id;
   }

   public void setId(Long id) {
      this.id = id;
   }
}

class Teacher extends Person {
   List<Book> books;
   public List<Book> getBooks() {
      return books;
   }

   public void setBooks(List<Book> books) {
      this.books = books;
   }
}