Entitymanager merge not updating record

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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.

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