Create relation between an entity and non-entity objects

Question

I have some domain object in my webapp named of Site. Site would be contains list of IP addresses, that is

@Entity
class Site {

    ...

    @ManyToMany(fetch=FetchType.LAZY)
    public Set<String> ips= new HashSet<String>();

    ...

}

But hibernate is down when I try to start webapp with error:

Caused by: org.hibernate.AnnotationException: Use of @OneToMany or @ManyToMany targeting an unmapped class: my.webapp.Site.ips[java.lang.String]

What's the problem?

Piotr Nowicki · Accepted Answer · 2011-11-05 11:50:31Z

1

You cannot use relational annotations (i.e. @ManyToMany) if you don't have a relationship with an Entity. If you have basic type (as in this case - String) you should use @ElementCollection

answered Nov 5, 2011 at 11:50

Piotr Nowicki

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