Strategy for Offline/Online data synchronization

Question

My requirement is I have server J2EE web application and client J2EE web application. Sometimes client can go offline. When client comes online he should be able to synchron

Answer 1

What is best suited as the client-side data store in your application? You can choose from an embedded database like SQLite or a message queue or some object store or (if none of these can be used since it is a web application) files/ documents saved on the client using Web DB or IndexedDB through HTML 5's LocalStorage API.

Check the paper Gold Rush: Mobile Transaction Middleware with Java-Object Replication. Microsoft's documentation of occasionally connected systems describes two approaches: service-oriented or message-oriented and data-oriented. Gold Rush takes the earlier approach. The later approach uses database merge-replication.