87 words

merge(entity) - JPA EntityManager's method

Method
javax.persistence.EntityManager
T merge(
  T entity
)

Merge the state of the given entity into the current persistence context.
Parameters:
entity - entity instance
Returns:
the managed instance that the state was merged to
Throws:
IllegalArgumentException - if instance is not an entity or is a removed entity
TransactionRequiredException - if invoked on a container-managed entity manager of type PersistenceContextType.TRANSACTION and there is no transaction
Since:
JPA 1.0

This documentation page is derived (with some adjustments) from the open source JPA 2 RI (EclipseLink)
and is available under the terms of the Eclipse Public License, v. 1.0 and Eclipse Distribution License, v. 1.0.
Object Relational Mapping (ORM) JPA 2 providers include Hibernate, EclipseLink, TopLink, OpenJPA and DataNucleus.
Object DB is not an ORM JPA implementation but an Object Database for Java with built in JPA 2 support.