Message Title

the problem is that to persist an instance of PostDetails you need to persist first a Post in order to obtain its id, but you cannot do this without a PostDetails because of the optional = false oprion;

A solution is

 
                                                                public class Post implements Serializable {
		@Id
		private long id;

		@MapsId
		@JoinColumn(name = "id")
		@OneToOne(cascade = {CascadeType.ALL}, optional = false, fetch = FetchType.LAZY)
		private PostDetails details;
...
}
 
                                                            

 
                                                                public class PostDetails implements Serializable {
		@Id
		@GeneratedValue(strategy = GenerationType.AUTO)
		private long id;

		@OneToOne(mappedBy = "details")
		private Post post;
..
} 
 
                                                            

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