Module jakarta.data

Package jakarta.data.metamodel

package jakarta.data.metamodel

A static metamodel for entities that are used in Jakarta Data repositories.

The StaticMetamodel allows for type-safe operations that avoid the need to hard-code entity attribute names as Strings. For example,

 @Entity
 public class Product {
     @Id
     public long id;

     public String name;

     public float price;
 }

 @StaticMetamodel(Product.class)
 public interface _Product {
     String ID = "id";
     String NAME = "name";
     String PRICE = "price";

     SortableAttribute<Product> id = new SortableAttributeRecord<>(ID);
     TextAttribute<Product> name = new TextAttributeRecord<>(NAME);
     SortableAttribute<Product> price = new SortableAttributeRecord<>(PRICE);
 }

 ...

 @Repository
 Products products;

 ...

 Order<Product> order =
         Order.by(_Product.price.desc(),
                  _Product.name.asc(),
                  _Product.id.asc());

 page1 = products.findByNameLike(namePattern, pageRequest);

The module Javadoc provides an overview of Jakarta Data.