Lombok.hashCode issue with "java.lang.StackOverflowError: null"

You have a circular dependency between book and bookdetails. You probably need to exclude book from BookDetail or bookDetail from Book.

You can add @EqualsAndHashCode(exclude="book"). For more information, see the EqualsAndHashCode documentation.

lambok resulted to a circular dependency

reason: the toString() method

solution: replace one of your models to

@Getter
@Setter
public class BookDetail

instead of

@Data
public class BookDetail

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