| Gets called by JpaTemplate.execute with an active
JPA EntityManager. Does not need to care about activating
or closing the EntityManager, or handling transactions.
Note that JPA callback code will not flush any modifications to the
database if not executed within a transaction. Thus, you need to make
sure that JpaTransactionManager has initiated a JPA transaction when
the callback gets called, at least if you want to write to the database.
Allows for returning a result object created within the callback,
i.e. a domain object or a collection of domain objects.
A thrown custom RuntimeException is treated as an application exception:
It gets propagated to the caller of the template.
Parameters:
em - active EntityManager a result object, or null if none
throws:
PersistenceException - if thrown by the JPA API
See Also: org.springframework.orm.jpa.JpaTemplate.execute
See Also: org.springframework.orm.jpa.JpaTemplate.executeFind |