Do not use @Data for JPA Entities

[mlemnian]

spring-boot-jpa-bulk-insert-performance/src/main/java/com/amrut/prabhu/bulkdatainsert/Book.java

Line 10 in f9af79e

@Data

You shouldn't use lombok's @Data annotation in case of JPA entities.
In the case of entities, two entities are the same iff their @Ids are the same! Lombok is not aware of that, because it generates primitive equals() and hashcode() methods.