ids for this class must be manually assigned before calling save()

Question

I\'ve got some problem with hibernate @OneToMany mapping. It goes like here

@Entity
@Table(name = \"albums\")
@SequenceGenerator(name = \"ALBUMS         


        

Answer 1

I was facing the same problem, but what worked for me was

B oB = new B();        // Class B contains two objects of class A

A oA1 = new A();
oA1.Name = "First";
oB.PlaceA1 = oA1;

A oA2 = new A();
oA2.Name = "Second";
oB.PlaceA2 = oA2;

Changed to

B oB = new B();        // Class B contains two objects of class A

A oA1 = new A();
oA1.ID = 1;            // This was missing(Manual Assignment of ID field)
oA1.Name = "First";
oB.PlaceA1 = oA1;

A oA2 = new A();
oA2.ID = 2;            // This was missing(Manual Assignment of ID field)
oA2.Name = "Second";
oB.PlaceA2 = oA2;