refresh(entity) - JPA EntityManager's method

void refresh(
  Object entity

Refresh the state of the instance from the database, overwriting changes made to the entity, if any.
entity - entity instance
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.TRANSACTION and there is no transaction
EntityNotFoundException - if the entity no longer exists in the database
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.
ObjectDB is not an ORM JPA implementation but an Object Database for Java with built in JPA 2 support.