hibernate - Redundant column - one to one mapping with composite id -

this model

@entity public class picture {      @embeddedid     private pictureid id;      ...    }  @embeddable public class pictureid implements serializable {     private static final long serialversionuid = -8285116986358642545l;      @column(nullable = false, name = "gallery_id") private long galleryid;     @column(nullable = false, name = "author_id") private long authorid;     @column(nullable = false, name = "ordinal_number") private int ordinalnumber;      ...    }  @entity public class gallery {      @id     @generatedvalue     private long id;     private string name;      @onetoone     @joincolumns({             @joincolumn(name = "redundant_gallery_id", referencedcolumnname = "gallery_id"),             @joincolumn(name = "cover_author_id", referencedcolumnname = "author_id"),             @joincolumn(name = "cover_ordinal_number", referencedcolumnname = "ordinal_number")     })     private picture cover;      ... } 

i guess specifing @joincolums here not necessary wanted make more clear. model there redundant column created in gallery table mirrors value of id. rid of column. field cover might null.

after thinking lot on decided better move mapping external table. didn't solve problem , gets more complicated.

@entity public class gallery {      @onetoone     @jointable(name = "gallery_cover",         joincolumns = {                 @joincolumn(name = "gallery_id", referencedcolumnname = "id")         },         inversejoincolumns = {                 @joincolumn(name = "redundant_gallery_id", referencedcolumnname = "gallery_id"),                 @joincolumn(name = "author_id", referencedcolumnname = "author_id"),                 @joincolumn(name = "ordinal_number", referencedcolumnname = "ordinal_number")     })     private picture cover; } 

i trying use @associationoverride , @attributeoverride failed. can me these mappings?

---

edit: here repository model

forget join table , redundant column name. it's ok use same column name twice in 1 entity long 1 instance of can inserted/updated. @column , @joincolumn annotations let override default insertable/updatable values.

@entity public class gallery {      @id     @generatedvalue     private long id;     private string name;      @onetoone     @joincolumns({             // no new column name here, specify insertable/updatable             @joincolumn(name = "gallery_id", insertable=false, updatable=false),             @joincolumn(name = "cover_author_id", referencedcolumnname = "author_id", insertable=false, updatable=false),             @joincolumn(name = "cover_ordinal_number", referencedcolumnname = "ordinal_number", insertable=false, updatable=false)     })     private picture cover;      ... } 

the cleaner approach, however, change primary key on picture doesn't include galleryid. if authorid , ordinalnumber specify unique key, remove galleryid join.