i have one course class and one tutorials class. I couse class i hav a set of tutorials. When i delete course i want the set of tutorials associated with that course aslo to be deleted. when i try to delete couse only the foreign key cid in tutorial table become null but all othere fields of tutorials tabel r intact
i course.hbb.xml contains
<set cascade="delete,delete-orphan,all" name="tutorials" order-by="created_date desc">
<key column="cid"/>
<one-to-many class="org.psl.cms.DAO.Tutorials"/>
</set>

and tutorials.hbm.xml contains


<hibernate-mapping>
<class catalog="CMS" name="org.psl.cms.DAO.Course" table="course">
<id name="cid" type="int">
<column name="cid"/>
<generator class="increment"/>
</id>
<property name="cname" type="string">
<column length="50" name="cname"/>
</property>
<property name="details" type="string">
<column length="300" name="details"/>
</property>
<property name="trainer" type="string">
<column length="50" name="trainer"/>
</property>
<property name="startdate" type="date">
<column length="10" name="startdate"/>
</property>
<property name="enddate" type="date">
<column length="10" name="enddate"/>
</property>
<property name="lastregdate" type="date">
<column length="10" name="lastregdate"/>
</property>
<property name="lastdregdate" type="date">
<column length="10" name="lastdregdate"/>
</property>
<property name="noseats" type="java.lang.Integer">
<column name="noseats"/>
</property>
<set cascade="delete-orphan,all" inverse="true" name="applications" order-by="apptype desc,appdatetime asc ">
<key column="cid"/>
<one-to-many class="org.psl.cms.DAO.Application"/>
</set>
<set cascade="delete-orphan,all" name="prerequisite">
<key column="cid"/>
<one-to-many class="org.psl.cms.DAO.Prerequisite"/>
</set>
<set cascade="delete,delete-orphan,all" name="tutorials" order-by="created_date desc">
<key column="cid"/>
<one-to-many class="org.psl.cms.DAO.Tutorials"/>
</set>
<set name="parentpost" cascade="all" order-by="ppid asc">
<key column="cid"/>
<one-to-many class="org.psl.cms.DAO.Parentpost"/>
</set>
<set name="accepted_application" where="apptype =2 ">
<key column="cid"/>
<one-to-many class="org.psl.cms.DAO.Application"/>
</set>
</class>
</hibernate-mapping>