Javax persistence entitymanager which jar

Listing 2 shows the contents of this file. The persistence. A persistence-unit has a name, which we'll use later when we create the EntityManager , and it defines the attributes of that unit. In this case, we configure properties in this unit to do the following:. For this application, we're modeling a Book class and an Author class. These entities have a one-to-many relationship, meaning that a book can only be written by a single author, but an author can write many books.

This domain model is shown in Figure 1. Note : When we talk about database tables we typically speak about a "data model," but when we talk about Java entities and their relationships we typically refer to it as a "domain model. The Book 's id attribute is annotated with both the Id and GeneratedValue.

The Id annotation identifies the id as the primary key of the Book , which will resolve to the primary key of the underlying database. Collectives on Stack Overflow. Learn more. What jar should I include to use javax. Ask Question. Asked 12 years, 7 months ago. Active 6 years ago. Viewed k times. Improve this question. Sergey Sergey 2, 2 2 gold badges 26 26 silver badges 32 32 bronze badges.

Add a comment. Active Oldest Votes. Improve this answer. I'm using intellij and it tells me that it couldn't find javax. Schildmeijer Schildmeijer Dave Shah Dave Shah 81 1 1 silver badge 1 1 bronze badge.

Search for an entity of the specified class and primary key. If the entity instance is contained in the persistence context, it is returned from there. If a vendor-specific property or hint is not recognized, it is silently ignored. Parameters: entityClass - entity class primaryKey - primary key properties - standard and vendor-specific properties and hints Returns: the found entity instance or null if the entity does not exist Throws: IllegalArgumentException - if the first argument does not denote an entity type or the second argument is is not a valid type for that entity's primary key or is null Since: Java Persistence 2.

Search for an entity of the specified class and primary key and lock it with respect to the specified lock type. If the entity instance is contained in the persistence context, it is returned from there, and the effect of this method is the same as if the lock method had been called on the entity. If the entity is found within the persistence context and the lock mode type is pessimistic and the entity has a version attribute, the persistence provider must perform optimistic version checks when obtaining the database lock.

If these checks fail, the OptimisticLockException will be thrown. If the lock mode type is pessimistic and the entity instance is found but cannot be locked: the PessimisticLockException will be thrown if the database locking failure causes transaction-level rollback the LockTimeoutException will be thrown if the database locking failure causes only statement-level rollback If a vendor-specific property or hint is not recognized, it is silently ignored.

Portable applications should not rely on the standard timeout hint. Depending on the database in use and the locking mechanisms used by the provider, the hint may or may not be observed. Parameters: entityClass - entity class primaryKey - primary key lockMode - lock mode properties - standard and vendor-specific properties and hints Returns: the found entity instance or null if the entity does not exist Throws: IllegalArgumentException - if the first argument does not denote an entity type or the second argument is not a valid type for that entity's primary key or is null TransactionRequiredException - if there is no transaction and a lock mode other than NONE is specified or if invoked on an entity manager which has not been joined to the current transaction and a lock mode other than NONE is specified OptimisticLockException - if the optimistic version check fails PessimisticLockException - if pessimistic locking fails and the transaction is rolled back LockTimeoutException - if pessimistic locking fails and only the statement is rolled back PersistenceException - if an unsupported lock call is made Since: Java Persistence 2.

If the requested instance does not exist in the database, the EntityNotFoundException is thrown when the instance state is first accessed. The persistence provider runtime is permitted to throw the EntityNotFoundException when getReference is called.

The application should not expect that the instance state will be available upon detachment, unless it was accessed by the application while the entity manager was open. Parameters: entityClass - entity class primaryKey - primary key Returns: the found entity instance Throws: IllegalArgumentException - if the first argument does not denote an entity type or the second argument is not a valid type for that entity's primary key or is null EntityNotFoundException - if the entity state cannot be accessed flush void flush Synchronize the persistence context to the underlying database.

Throws: TransactionRequiredException - if there is no transaction or if the entity manager has not been joined to the current transaction PersistenceException - if the flush fails setFlushMode void setFlushMode FlushModeType flushMode Set the flush mode that applies to all objects contained in the persistence context.

Returns: flushMode lock void lock Object entity, LockModeType lockMode Lock an entity instance that is contained in the persistence context with the specified lock mode type. If a pessimistic lock mode type is specified and the entity contains a version attribute, the persistence provider must also perform optimistic version checks when obtaining the database lock.

Parameters: entity - entity instance lockMode - lock mode properties - standard and vendor-specific properties and hints Throws: IllegalArgumentException - if the instance is not an entity or is a detached entity TransactionRequiredException - if there is no transaction or if invoked on an entity manager which has not been joined to the current transaction EntityNotFoundException - if the entity does not exist in the database when pessimistic locking is performed OptimisticLockException - if the optimistic version check fails PessimisticLockException - if pessimistic locking fails and the transaction is rolled back LockTimeoutException - if pessimistic locking fails and only the statement is rolled back PersistenceException - if an unsupported lock call is made Since: Java Persistence 2.

Parameters: entity - entity instance Throws: IllegalArgumentException - if the instance is not an entity or the entity is not managed TransactionRequiredException - if there is no transaction when invoked on a container-managed entity manager of type PersistenceContextType. Parameters: entity - entity instance properties - standard and vendor-specific properties and hints Throws: IllegalArgumentException - if the instance is not an entity or the entity is not managed TransactionRequiredException - if there is no transaction when invoked on a container-managed entity manager of type PersistenceContextType.

If the lock mode type is pessimistic and the entity instance is found but cannot be locked: the PessimisticLockException will be thrown if the database locking failure causes transaction-level rollback the LockTimeoutException will be thrown if the database locking failure causes only statement-level rollback. Parameters: entity - entity instance lockMode - lock mode Throws: IllegalArgumentException - if the instance is not an entity or the entity is not managed TransactionRequiredException - if invoked on a container-managed entity manager of type PersistenceContextType.

Parameters: entity - entity instance lockMode - lock mode properties - standard and vendor-specific properties and hints Throws: IllegalArgumentException - if the instance is not an entity or the entity is not managed TransactionRequiredException - if invoked on a container-managed entity manager of type PersistenceContextType. Changes made to entities that have not been flushed to the database will not be persisted. Unflushed changes made to the entity if any including removal of the entity , will not be synchronized to the database.

Entities which previously referenced the detached entity will continue to reference it. Parameters: entity - entity instance Returns: boolean indicating if entity is in persistence context Throws: IllegalArgumentException - if not an entity getLockMode LockModeType getLockMode Object entity Get the current lock mode for the entity instance.

Parameters: entity - entity instance Returns: lock mode Throws: TransactionRequiredException - if there is no transaction or if the entity manager has not been joined to the current transaction IllegalArgumentException - if the instance is not a managed entity and a transaction is active Since: Java Persistence 2.

Parameters: propertyName - name of property or hint value - value for property or hint Throws: IllegalArgumentException - if the second argument is not valid for the implementation Since: Java Persistence 2.

Changing the contents of the map does not change the configuration in effect. Returns: map of properties and hints in effect for entity manager Since: Java Persistence 2. Parameters: criteriaQuery - a criteria query object Returns: the new query instance Throws: IllegalArgumentException - if the criteria query is found to be invalid Since: Java Persistence 2.

Parameters: updateQuery - a criteria update query object Returns: the new query instance Throws: IllegalArgumentException - if the update query is found to be invalid Since: Java Persistence 2. Parameters: deleteQuery - a criteria delete query object Returns: the new query instance Throws: IllegalArgumentException - if the delete query is found to be invalid Since: Java Persistence 2. The select list of the query must contain only a single item, which must be assignable to the type specified by the resultClass argument.

Parameters: qlString - a Java Persistence query string resultClass - the type of the query result Returns: the new query instance Throws: IllegalArgumentException - if the query string is found to be invalid or if the query result is found to not be assignable to the specified type Since: Java Persistence 2. Parameters: name - the name of a query defined in metadata resultClass - the type of the query result Returns: the new query instance Throws: IllegalArgumentException - if a query has not been defined with the given name or if the query string is found to be invalid or if the query result is found to not be assignable to the specified type Since: Java Persistence 2.

If the query is not an update or delete query, query execution will result in each row of the SQL result being returned as a result of type Object[] or a result of type Object if there is only one column in the select list.