[jboss-user] [EJB3] - Creating EntityManagers dynamically (e.g. through a config file or database)

[jaabax]

jaabax [https://community.jboss.org/people/jaabax] created the discussion

"Creating EntityManagers dynamically (e.g. through a config file or database)"

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Hi folks.
Like I asked in the title, how do I create EntityManagers dynamically?
A example is: I have 4 clients using my application (CompanyA, CompanyB, CompanyC, CompanyD). I do not want to create a @PersistenceContext for each one because tomorrow I can add the 5th one and this will require a new deploy and server restart (I want to store clients information on the database).
I've read on Java EE 6 tutorial that I can use @PersistenceUnit to create an EntityManagerFactory and use createEntityManager() afterwards to create the EntityManager (and store the entity managers instances in a map for example).
This is the right way to do it? I'm concerned about concurrency, best practices and etc.
I am using JBoss AS 7 as my application server.
Thanks in advance.
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