3.4. Connecting to a Datastore
After a persistence-capable class has been defined, the next step is to implement an application that actually uses it. Any JDO application must get a connection to the underlying datastore before it can do anything. This is done by configuring an instance of PersistenceManagerFactory and then using it to get a PersistenceManager.
PersistenceManagerFactory is just a Java interface; JDO does not specify how an actual PersistenceManagerFactory instance should be created. However, it does provide a helper class called JDOHelper that, among other things, provides a common bootstrap mechanism to create a PersistenceManagerFactory instance based on a specified set of properties:
static public PersistenceManagerFactory ...
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