119 lines
7.2 KiB
Plaintext
119 lines
7.2 KiB
Plaintext
= 5.0 Migration Guide
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:toc:
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This guide discusses migration from Hibernate ORM version 4.3 to version 5.0. For migration from
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earlier versions, see any other pertinent migration guides as well.
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== Re-purposing of Configuration
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Configuration, historically, allowed users to iteratively add settings and mappings in any order and to query the
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state of settings and mapping information in the middle of that process. Which meant that building the mapping
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information could not effectively rely on any settings being available. This lead to many limitations and problems.
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Quite a few methods have been removed from Configuration. Be sure to see the User Guide chapter on bootstrapping for
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details. For applications that integrate with Hibernate via one or more APIs, this change might effect your
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integrations as well.
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== Short-naming
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In an effort to insulate applications from refactoring efforts, Hibernate has begun to recognize "short name" values for
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certain configuration settings. These are discussed in detail in the User Guide in the pertinent sections.
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Where available, we highly recommend using the short name for a setting value.
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== Transactions
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The transaction SPI underwent a major redesign as part of 5.0 as well. From a user perspective this generally
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only comes into view in terms of configuration. Previously applications would work with the different backend
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transaction stratagies directly via the `org.hibernate.Transaction` API. In 5.0 a level of indirection has been
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added here. The API implementation of `org.hibernate.Transaction` is always the same now. On the backend, the
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`org.hibernate.Transaction` impl talks to a `org.hibernate.resource.transaction.TransactionCoordinator` which represents
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the "transactional context" for a given Session according to the backend transaction strategy. Users generally do not
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need to care about the distinction.
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The change is noted here because it might affect your bootstrap configuration. Whereas previously applications would
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specify `hibernate.transaction.factory_class` and refer to a `org.hibernate.engine.transaction.spi.TransactionFactory` FQN,
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with 5.0 the new contract is `org.hibernate.resource.transaction.TransactionCoordinatorBuilder` and is specified using the
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`hibernate.transaction.coordinator_class` setting. See `org.hibernate.cfg.AvailableSettings.TRANSACTION_COORDINATOR_STRATEGY`
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JavaDocs for additional details.
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The following short-names are recognized:
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`jdbc`::(the default) says to use JDBC-based transactions (`org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl`)
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`jta`::says to use JTA-based transactions (`org.hibernate.resource.transaction.backend.jta.internal.JtaTransactionCoordinatorImpl`)
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See the User Guide for additional details.
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== Type handling
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* Migrated `org.hibernate.metamodel.spi.TypeContributor` and `org.hibernate.metamodel.spi.TypeContributions`
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to `org.hibernate.boot.model.TypeContributor` and `org.hibernate.boot.model.TypeContributions`
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* Built-in `org.hibernate.type.descriptor.sql.SqlTypeDescriptor` implementations no longer auto-register themselves
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with `org.hibernate.type.descriptor.sql.SqlTypeDescriptorRegistry`. Applications using custom SqlTypeDescriptor
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implementations extending the built-in ones and relying on that behavior should be updated to call
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`SqlTypeDescriptorRegistry#addDescriptor` themselves.
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* The JDBC type for "big_integer" (org.hibernate.type.BigIntegerType) properties has changed from
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java.sql.Types,NUMERIC to java.sql.Types.BIGINT.
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* For ids defined as UUID with generation, for some databases it is required to explicitly set the `@Column( length=16 )`
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in order to generate BINARY(16) so that comparisons properly work.
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* For EnumType mappings defined in hbm.xml where the user wants name-mapping (`javax.persistence.EnumType#STRING`)
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the configuration must explicitly state that using either the `useNamed` (true) setting or by specifying the `type`
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setting set to the value 12 (VARCHAR JDBC type code).
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== Naming strategies
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Historically Hibernate provided just a singular contract for applying a "naming strategy". Starting in 5.0 this has
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been split into 2 distinct contracts:
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* `ImplicitNamingStrategy` - is used whenever a table or column is not explicitly named to determine the name to use.
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* `PhysicalNamingStrategy` - is used to convert a "logical name" (either implicit or explicit) name of a table or column
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into a physical name (e.g. following corporate naming guidelines)
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== Changed setting defaults
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* Default value for `hibernate.id.new_generator_mappings` setting changed to true for 5.0. See
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`org.hibernate.cfg.AvailableSettings#USE_NEW_ID_GENERATOR_MAPPINGS` javadocs.
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* The default ImplicitNamingStrategy (`hibernate.implicit_naming_strategy`) has changed to the JPA-compliant one. See
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`org.hibernate.cfg.AvailableSettings.IMPLICIT_NAMING_STRATEGY` javadocs for details. If you experience problems
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migrating dues to implicit table or column names you may want to specify the legacy strategy
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(`legacy-hbm` \ `org.hibernate.boot.model.naming.ImplicitNamingStrategyLegacyHbmImpl`).
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* `hibernate.jdbc.batch_versioned_data` default value is now true; Oracle dialects set this property to false,
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except for Oracle12cDialect
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== Misc
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* `cfg.xml` files are again fully parsed and integrated (events, security, etc)
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* properties loaded from `cfg.xml` through EntityManagerFactory did not previously prefix names with "hibernate." this is now made consistent.
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* `Configuration` is no longer `Serializable`
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* `org.hibernate.dialect.Dialect.getQuerySequencesString` expected to retrieve catalog, schema, and increment values as well
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* removed AuditConfiguration in preference for new `org.hibernate.envers.boot.internal.EnversService`
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* changed AuditStrategy method parameters from (removed) AuditConfiguration to (new) EnversService
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* Moving `org.hibernate.hql.spi.MultiTableBulkIdStrategy` and friends to new `org.hibernate.hql.spi.id` package
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and sub-packages
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* Complete redesign of "property access" contracts
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* Valid `hibernate.cache.default_cache_concurrency_strategy` setting values are now defined via
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`org.hibernate.cache.spi.access.AccessType#getExternalName` rather than the `org.hibernate.cache.spi.access.AccessType`
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enum names; this is more consistent with other Hibernate settings
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== Deprecations
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* Removed the deprecated `org.hibernate.cfg.AnnotationConfiguration`
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* Removed deprecated `org.hibernate.id.TableGenerator` id-generator
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* Removed deprecated `org.hibernate.id.TableHiLoGenerator` (hilo) id-generator
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* Deprecated `org.hibernate.id.SequenceGenerator` and its subclasses
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* Added a new dedicated "deprecation logger" to consolidate logging for deprecated uses.
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== Changed/Moved contracts
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* `org.hibernate.integrator.spi.Integrator` contract changed to account for bootstrap redesign
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* Extracted `org.hibernate.engine.jdbc.env.spi.JdbcEnvironment` from `JdbcServices`;
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created `org.hibernate.engine.jdbc.env` package and moved a few contracts there.
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* Introduction of `org.hibernate.boot.model.relational.ExportableProducer` which will effect any
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`org.hibernate.id.PersistentIdentifierGenerator` implementations
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* Changed to signature of `org.hibernate.id.Configurable` to accept `ServiceRegistry` rather than just `Dialect`
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