I've use hibernate with regular java projects, but when I'm trying to use it with a dynamic web project I have this problem

java.lang.ClassNotFoundException: org.hibernate.cfg.Configuration

I have the same jars in my built path than in the others projects, I've been wondering if I need another jar or is there another problem?

Please help me, and my apologies for my English!

Ensure your hibernate jars are in your webapp/WEB-INF/lib.

Thanks that solve the problem!!! ;)

Know I'm having a problem mapping...

Server Exception. ID: e61a35_12aaef34c43_4
org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: modelos.MtecForm.tecnicoRef in modelos.Mtecnico.tecnicoFormularioList

here is what I usually do
In the Many to one class

.......
private Mtecnico tecnicoRef;
.......
@ManyToOne
public Mtecnico getTenicoRef() {
return tecnicoRef;
}
.......

and in the one to many class

.......
@OneToMany(mappedBy = "tecnicoRef")
@LazyCollection(LazyCollectionOption.FALSE)
@Cascade({ CascadeType.ALL, CascadeType.DELETE_ORPHAN })
public List<MtecForm> getTecnicoFormularioList() {
return tecnicoFormularioList;
}
.....

Please help me if you see the problem!