[persistance] delete et foreign keys

Bonjour a tous,

j'ai un probleme de delete due a une foreign key

En fait, j'ai une table Student, une Classe et une classe d'associationentre Student et Classe (un eleve peut etre dans une ou plusieurs classes).

Class :

Code:

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<class name="persistenceClass.Class" table="T_CLASS">
		<id name="Id" column="CLASS_ID">
			<generator class="native" />
		</id>
		<many-to-one name="Formation" column="CLASS_FORMATION" class="persistenceClass.Formation" />
		<many-to-one name="Year" column="CLASS_YEAR" class="persistenceClass.Year" />
	</class>

Student :

Code:

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	<class name="persistenceClass.Person" table="T_PERSON">
		<id name="Id" column="PERSON_ID" >
			<generator class="native" />
		</id>
		<property name="FirstName" column="PERSON_FIRST_NAME" not-null="true" />
		<property name="LastName" column="PERSON_LAST_NAME" not-null="true" />
		<property name="Type" column="PERSON_TYPE" not-null="true" />
		<property name="BirthDate" column="PERSON_BIRTH_DATE" />
		<property name="BirthCity" column="PERSON_BIRTH_CITY" />
		<property name="PhoneNumber" column="PERSON_PHONE_NUMBER" />
		<property name="MobileNumber" column="PERSON_MOBILE_NUMBER" />
		<property name="Mail" column="PERSON_MAIL" />
		<property name="Address" column="PERSON_ADDRESS_ADDRESS" />
		<property name="ZipCode" column="PERSON_ADDRESS_ZIPCODE" />
		<property name="City" column="PERSON_ADDRESS_CITY" />
		<property name="Image" column="PERSON_IMAGE" type="image" />
		<many-to-one name="Country" column="PERSON_ADDRESS_COUNTRY" class="persistenceClass.Country" />
		<many-to-one name="BirthCountry" column="PERSON_BIRTH_COUNTRY" class="persistenceClass.Country" />
		<many-to-one name="Civility" column="PERSON_CIVILITY" class="persistenceClass.Civility" />
		<many-to-one name="Sex" column="PERSON_SEX" class="persistenceClass.Sex" />
		<joined-subclass name="persistenceClass.Student" table="T_STUDENT">
			<key column="PERSON_ID" />
		</joined-subclass>
		<joined-subclass name="persistenceClass.Teacher" table="T_TEACHER">
			<key column="PERSON_ID" />
		</joined-subclass>
	</class>

Et ma classe d'association :

Code:

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	<class name="persistenceClass.ClassStudent" table="T_CLASS_STUDENT">
		<composite-id>
			<key-many-to-one name="Student" class="persistenceClass.Student" column="CLASS_STUDENT_STUDENT" />
			<key-many-to-one name="SchoolClass" class="persistenceClass.Class" column="CLASS_STUDENT_CLASS"  />
		</composite-id>
	</class>

Lorsque que je supprime un Studient, j'ai l'exception suivante :

Code:

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5763 [AWT-EventQueue-0] WARN org.hibernate.util.JDBCExceptionReporter - SQL Error: 1451, SQLState: 23000
5764 [AWT-EventQueue-0] ERROR org.hibernate.util.JDBCExceptionReporter - Cannot delete or update a parent row: a foreign key constraint fails (`projet`.`T_CLASS_STUDENT`, CONSTRAINT `FK5DBF3D89B38792B6` FOREIGN KEY (`CLASS_STUDENT_STUDENT`) REFERENCES `T_STUDENT` (`PERSON_ID`))

Le probleme est que je n'arrive pas a mettre de on-delete="cascade" j'ai tout essaye et j'ai des erreurs de mapping...

Merci d'avance

Cordialement,
NeoKript