jpa inheritance

i have jpa entities get another uses discriminator establish category combined (untested yet).

@entity(name="switches")
@discriminatorcolumn(name="type")
@discriminatorvalue(value="500")
public category dmsswitch extends switch implements serializable {}

@mappedsuperclass
public summary category switch implements iswitch {}

@entity(name="switch_accounts")
public category switchaccounts implements serializable {
    @manytoone()
    @joincolumn(name="switch_id")
    dmsswitch _switch;
}

so switchaccounts category i bottom category switch since i don't know vigilant combined until runtime. i grasp this?