java - Composite primary key with not primitive attributes -

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i new java , hibernate. i've got problem composite key. trying that:

@entity class {     @id     int id; }  @entity class b {     @id     int id; }   @entity class c {     @embeddedid     c_pk c_pk; }  @embeddable class c_pk {     a;     b b; }

when perform 

... session.save(c); ...

then exception thrown type of , b cannot inserted database. possible somehow tell hibernate don't save object id? approach absolutely wrong , should use primitive data types @ c_pk class?

you should put @manytoone (or onetoone) join columns on , b references in c_pk.

@embeddable class c_pk {     @manytoone     a;     @manytoone     b b; }

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