[hibernate-issues] [Hibernate-JIRA] Resolved: (HBX-1039) many-to-many associations not working with hibernate

many-to-many associations not working with hibernate ---------------------------------------------------- Key: HBX-1039 URL: http://opensource.atlassian.com/projects/hibernate/browse/HBX-1039 Project: Hibernate Tools Issue Type: Bug Environment: Hibernate Tools 3.2 beta 10, Oracle 10G, Reporter: Vijaya Krishnan Associated tables in a Many-To-Many relationship not updating with Hibernate. No HQL is generated to insert values into the link table. Using Hibernate Tools 3.2 beta 10 Here are the hbm and java snippets. ------------------------------------------------------------------------------------- Person.hbm.xml <!-- bi-directional many-to-many association to Staff --> <set name="staffs" table="PERSON_STAFF" lazy="false" inverse="true" cascade="save-update"> <key> <column name="PERSON_OID" precision="22" scale="0" not-null="true" /> </key> <many-to-many class="domain.Staff" column="STAFF_OID" fetch="join" /> </set> </class> ----------------------------- Staff.hbm.xml <!-- bi-directional many-to-many association to Person --> <set name="persons" table="PERSON_STAFF" cascade="all"> <key> <column name="STAFF_OID" precision="22" scale="0" not-null="true" /> </key> <many-to-many column="PERSON_OID" class="domain.Person" /> </set> -------------------------------------------------------------------- person.java public class Person implements java.io.Serializable { private long oid; private String userid; private String firstname; private String lastname; private Set staffs = new HashSet(); //other getters and setters here. public Set getStaffs() { return this.staffs; } public void setStaffs(Set staffs) { this.staffs = staffs; } ------------------------------------------------------ staff.java public class Staff implements java.io.Serializable { private long oid; private String staffname; private long headcount; private Set persons = new HashSet(0); //other getters and setters here. public Set getPersons() { return persons; } public void setPersons(Set persons) { this.persons = persons; } } ------------------------------------------------------------------------ Link table columns: CREATE TABLE PERSON_STAFF( PERSON_OID NUMBER NOT NULL, STAFF_OID NUMBER NOT NULL) PERSON table has primary key oid and STAFF table has primary key oid as well. The link table is made of only the columns - person-oid and staff_oid. The CONSTRAINTs of priamry and foreign key relationships are all set in the database. ------------------------------------------------------------------- The lines of code to update the tables: person.getStaffs().add(newStaff); //Line 1 update(person); //Line 2 ------------------------------------------- A person is associated with multiple staffs e.g. five staffs. The line 2 update generates five updates to the staff table instead of one insert in the link table. The above does not update the link table PERSON_STAFF, but updates the person and staff table.