Hibernate One-to-One mapping with Annotations with mappedBy:
This Hibernate tutorial demonstrates how to use JPA annotations in order to implement a bidirectional one-to-one association on a foreign key.
mappedBy: The attribute mappedBy indicates that the entity in this
side is the inverse of the relationship, and the owner resides in the
"other" entity. This also means that you can access the other table
from the class which you've annotated with "mappedBy" (fully
bidirectional relationship).
The annotation mappedBy ideally should always be used in the Parent side (Book class) of the bi directional relationship, in this case it should be in Book class pointing to the member variable 'book' of the Child class (Author class)
Example:
Book.java
package
com.hibernate.practice.onetoone;
import...