| 
Class Summary | 
| MemoryDatabasePlugIn | 
MemoryDatabasePlugIn initializes and finalizes the
 persistent storage of User and Subscription information for the Struts
 Demonstration Application, using an in-memory database backed by an
 XML file. | 
| MemorySubscription | 
Concrete implementation of Subscription for an in-memory
 database backed by an XML data file. | 
| MemoryUser | 
Concrete implementation of User for an in-memory
 database backed by an XML data file. | 
| MemoryUserDatabase | 
Concrete implementation of UserDatabase for an in-memory
 database backed by an XML data file. |