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| Annotation | Explanation |
|---|---|
| @Column | Define columns, column names, and specifications about size and nullability. |
| @ElementCollection, @CollectionTable | Used to define collections of non JPA objects (like a set of String). |
| @Entity | Used to define JPA-tracked objects. |
| @Enumerated | Used to indicate fields that have enumerated values. |
| @id @GeneratedValue | Used to managed identifier fields and ID strategy. |
| @ManyToOne, @OneToOne, @OneToMany | Used to define object relationships between different @Entity annotated classes. |
| @MappedSuperclass | Used for abstract superclasses to indicate their fields should be included in persistence of concrete subclasses. |
| @Table | Used to indicate table names for objects. Default underscore-based naming convention is used. |
| @Temporal | Used @TemporalUsed for date fields. |
| @Transient | Used to avoid persistence of fields, these are typically used for DTO fields as we reuse the objects for data transfer. |
| @UniqueConstraint | Used to index columns that would otherwise not have indexes. Not actually used for uniqueness. |
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