PersistenceManager instances for application
use. It allows you to configure datastore connectivity and
to specify the default settings of the
PersistenceManagers it constructs.
You can also use it to programmatically discover what JDO
options your current vendor supports, enabling you to build
applications that optimize themselves for full-featured products, but
still function under more basic JDO implementations.
Kodo extends the standard
JDO vendors may supply public constructors for their
but the recommended method of obtaining a
PersistenceManagerFactory is through the
Java Connector Architecture (JCA) in a managed environment, or through
getPersistenceManagerFactory methods in an
unmanaged environment, as described in
Section 6.3, “PersistenceManagerFactory Construction”.
PersistenceManagerFactories obtained through
these means are immutable; any attempt to change their property settings
will result in a
JDOUserException. This is
because the returned factory may come from a pool, and might be
shared by other application components.
JDO requires that concrete
Serializable interface. This
allows you to create and configure a
serialize it to a file or store it in a Java Naming and Directory
Interface (JNDI) tree for later retrieval and use.