Package org.hibernate.metamodel

@Incubating package org.hibernate.metamodel

This package defines an API for accessing the runtime metamodel describing persistent entities in Java and their mappings to the relational database schema.

The runtime metamodel may be divided into two layers:

• The domain metamodel, which is an extension of the JPA metamodel and is used in query handling. This layer contains information about Java classes, but not about their mappings to the database.
• The mapping metamodel, which describes the application domain model and its mapping to the database. It is distinct from the JPA metamodel, which does not contain this O/R mapping information.

Related Packages

Package	Description
org.hibernate	This package defines the central Hibernate APIs, beginning with SessionFactory, which represents an instance of Hibernate at runtime and is the source of new instances of Session and StatelessSession, the most important APIs exposing persistence-related operations for entities.
org.hibernate.metamodel.internal
org.hibernate.metamodel.mapping	Defines the runtime mapping metamodel, which describes the mapping of the application's domain model parts (entities, attributes) to relational database objects (tables, columns).
org.hibernate.metamodel.spi	An SPI supporting custom instantiation of entity instances and embeddable objects.

Class	Description
AttributeClassification	An extended set of Attribute.PersistentAttributeType adding AttributeClassification.ANY
CollectionClassification	Classifications of the plurality.
MappingMetamodel	Access to information about the runtime relational O/R mapping model.
RepresentationMode	Enumeration of the built-in ways that Hibernate can represent the application's domain model.
RuntimeMetamodels	Entry point providing access to the runtime metamodels: the domain model, our implementation of the JPA-defined model of the Java types, and our relational mapping model of how these types are made persistent.
UnsupportedMappingException	Indicated a problem with a mapping.
ValueClassification	At the end of the day, any "value mapping" (id, version, attribute, collection element, etc.) can be one of a few classifications.