How can I resolve this an persist objects involved in many-to-many relation.

Thx.

Hibernate version:3.1

Mapping documents:

DocumenteGenerice
<set name="miscaris" cascade="save-update" table="miscari_documente" inverse="false">
<key>
<column name="documente_genericeId" length="15" />
</key>
<many-to-many class="lotofsamples.model.Miscari" column="MiscareId"/>
</set>

Miscari
<set name="documenteGenerices" table="miscari_documente" inverse="true" cascade="save-update">
<key>
<column name="MiscareId" length="17" />
</key>
<many-to-many class="lotofsamples.model.MiscariDocumente" column="documente_genericeId"/>
</set>


Code between sessionFactory.openSession() and session.close():

DocumenteGenerice docGen = new DocumenteGenerice();
docGen.setSerieDoc("DOCGEN00004");
docGen.setNumarDoc("00004");
docGen.setTipDocument("FA");
docGen.setObservatii("DocumentGeneric4");
docGen.setInGarantie(0);

Miscari miscare = new Miscari();
miscare.setObservatii("Miscare4");
miscare.setSensMiscare(1);

docGen.getMiscaris().add(miscare);
miscare.getDocumenteGenerices().add(docGen);

session.persist(miscare);
session.persist(docGen);


Full stack trace of any exception that occurs:

Exception in thread "main" java.lang.ClassCastException: lotofsamples.model.DocumenteGenerice
at org.hibernate.type.EntityType.toLoggableString(EntityType.java:154)
at org.hibernate.type.CollectionType.toLoggableString(CollectionType.java:146)
at org.hibernate.pretty.Printer.toString(Printer.java:53)
at org.hibernate.pretty.Printer.toString(Printer.java:90)
at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:97)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1009)
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:356)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
at lotofsamples.VerificareChei.main(VerificareChei.java:98)


Name and version of the database you are using:MySQL-4.17

The generated SQL (show_sql=true):

Debug level Hibernate log excerpt:

It seems to me that you're trying to model a many-to-many association between two tables.
One table is reflected in the Object Model by the class DocumenteGenerice and the other by the class Miscari.

If this is the case you should have this:
DocumenteGenerice
<set name="miscaris" cascade="save-update" table="miscari_documente" inverse="false">
<key>
<column name="documente_genericeId" length="15" />
</key>
<many-to-many class="lotofsamples.model.Miscari" column="MiscareId"/>
</set>

Miscari
<set name="documenteGenerices" table="miscari_documente" inverse="true" cascade="save-update">
<key>
<column name="MiscareId" length="17" />
</key>
<many-to-many class="lotofsamples.model.DocumenteGenerice" column="documente_genericeId"/>
</set>

But I suspect that in fact you're trying to model a one-to-many between
DocumenteGenerice and MiscariDocumente on one side and a many-to-one (one-to-many) between MiscariDocumente and Miscari on the other side.
If this is the case then you should use a MiscariDocumente as an intermediate entity class and have two one-to-many associations between three entities. The MiscariDocumente would be the many side of both.

Or use the MiscariDocumente as a value type this time and have a
<set name="miscaris"......
<composite-element class="MiscariDocumente">
<parent ....
<many-to-one name="miscare" class="Miscari" ....
<property.....
</composite-element>
</set>
An example to follow is in CaveatEmptor, mapping between Category and Items

Succes