Diagrams

Class diagram

classDiagram
    class Product{
        <<entity>>
        @Getter
        @Setter
        @AllArgsConstructor
        @NoArgsConstructor
        - id : Long
        - name : String
        - description : String
        - price : Double
        - imgUrl : String
        - date : Instant
        - categories : Set~Category~        
    }
    class ProductDTO{
        <<entity>>
        @Getter
        @Setter
        @NoArgsConstructor
        - id : Long
        - name : String
        - description : String
        - price : Double
        - imgUrl : String
        - date : Instant
        - categories : Set~CategoryDTO~
        ProductDTO(id,name,description,price,imgUrl,date)
        ProductDTO(entity)
    }
    class ProductRepository{
        <<repository-interface>>
    }
    class ProductResource{
        <<controller>>
        - service : ProducService
        findAll() ResponseEntityPage~ProductDTO~
        findById(id) ResponseEntity~ProductDTO~
        insert(dto) ResponseEntity~ProductDTO~
        update(dto) ResponseEntity~ProductDTO~
        delete(id) ResponseEntity~void~
    }
    class ProductService{
        <<service>>
        - repository : ProductRepository
        findAll() List~ProductDTO~
        findAllPaged(pageable) Page~ProductDTO~
        findById(id) ResponseEntity~ProductDTO~
        insert(dto) ResponseEntity~ProductDTO~
        update(dto) ResponseEntity~ProductDTO~
        delete(id) ResponseEntity~void~
    }
    class Category{
        <<entity>>
        @Data
        @AllArgsConstructor
        @NoArgsConstructor
        - id : Long
        - name : String
        - createdAt : Instant
        - updatedAt : Instant
        prePersist() void
        preUpdate() void
    }
    class CategoryRepository{
        <<repository-interface>>
    }
    class CategoryResource{
        <<controller>>
        - service : CategoryService
        findAll() ResponseEntityPage~CategoryDTO~
        findById(id) ResponseEntity~CategoryDTO~
        insert(dto) ResponseEntity~CategoryDTO~
        update(dto) ResponseEntity~CategoryDTO~
        delete(id) ResponseEntity~void~
    }
    class CategoryService{
        <<service>>
        - repository : CategoryRepository
        findAll() List~CategoryDTO~
        findAllPaged(pageable) Page~CategoryDTO~
        findById(id) ResponseEntity~CategoryDTO~
        insert(dto) ResponseEntity~CategoryDTO~
        update(dto) ResponseEntity~CategoryDTO~
        delete(id) ResponseEntity~void~
    }
    class CategoryDTO{
        <<dto>>
        @Getter
        @Setter
        @AllArgsConstructor
        @NoArgsConstructor
        - id : Long
        - name : String
    }
    class EntityNotFoundException{
      <<RuntimeException>>
    }
    class StandardError{
      @NoArgsConstructor
      @Getter
      @Setter
      - timestamp : Instant
      - status : Integer
      - error : String
      - message : String
      - path : String
    }
    Product *-- Category
    ProductDTO *-- CategoryDTO
    ProductDTO *-- Product
    ProductDTO *-- Category
    CategoryDTO *-- Category
    ProductService *-- Category
    ProductService *-- Product
    ProductService *-- CategoryDTO
    ProductService *-- ProductDTO
    ProductService *-- CategoryRepository
    ProductService *-- ProductRepository
    ProductService *-- DatabaseException
    ProductService *-- ResourceNotFoundException
    ProductResource *-- ProductDTO
    ProductResource *-- ProductService
    CategoryService *-- Category
    CategoryService *-- CategoryDTO
    CategoryService *-- CategoryRepository
    CategoryService *-- DatabaseException
    CategoryService *-- ResourceNotFoundException
    CategoryResource *-- CategoryDTO
    CategoryResource *-- CategoryService
    CategoryResource *-- EntityNotFoundException
    CategoryResource *-- StandardError

ER diagram

erDiagram
    USER ||--|{ ROLE : contains
    PRODUCT O|--|{ CATEGORY : contains
    USER {
      Long id PK
      String firstName
      String lastName
      String email
      String password
    }
    ROLE {
      String autority
      Long id PK
    }
    PRODUCT {
      Long id PK
      String name
      String description
      Double price
      String imgUrl
    }
    CATEGORY {
        Long id PK
        String name
    }

Value (left)	Value (right)	Meaning
|o	o|	Zero or one
||	||	Exactly one
}o	o{	Zero or more (no upper limit)
}|	|{	One or more (no upper limit)

References

:link: Diagrams wiki
:memo: Mermaid diagrams
:chart_with_upwards_trend: Diagrams online editor