Editing JavaJEEJPA (section)

===Entity Implementation===
with Spring Boot and Lombok:
# <code>@Entity</code> annotation at class level
# extend my BaseEntity class (documentation in java file)
# decide if field or property access (by placing the annotations at the fields or at the getters). This a philosophical discussion in the community, but field access seems to be the easiest and appropriate way.
# public or protected no-arg default ctor (e.g. Lombok @NoArgsConstructor)
# <code>implements Serializable</code> If an entity instance is to be passed by value as a detached object (e.g., through a remote interface), the entity class must implement the Serializable interface
# if not using Lombok annotation implement hashCode() and equals() if possible on a business or natural key and not on a generated id. Best solution is a generated UUID (search the web)
# create DB table - iff you let the JPA provider create the DB tables for the entity there is a default mapping of Java types to DB columns. This could be a problem because for example the [[#Default_Mapping_for_Java_types|default mapping]] of String is VARCHAR(255), so strings are truncated to 255 chars. In most cases it is better to create the DB tables by a script. Topics to consider are:
##NOT NULL
##AUTOINCREMENT
##initial value
# attribute names are mapped to db columns
## no capital letters
## capital letters in a string a prefixed with a underscore e.g. targetDate => target_date, isDone => is_done