Entitymanager merge not updating record
This is easier to implement than it might sound, especially if you use JPA entity manager and persistence context features: An application may concurrently access the same persistent state in two different persistence contexts.
However, an instance of a managed class is never shared between two persistence contexts.
in a wizard-style dialog spanning several request/response cycles).
even if you are not sure that data access will be needed to serve a particular request.
(This becomes important as soon as you are implementing some of the following patterns using request interception.)To complete this picture you also have to think about database transactions.
/** * */ package roseindia; import javax.persistence.
The most important point about Hibernate Entity Manager and concurrency control is that it is very easy to understand.