SDO ,WorkMananger,CommonJ overview

Service Data Objects (SDO) -- Provides a unifying programming model for data from heterogeneous data sources, including relational databases, XML data sources, Web services and enterprise information systems. This specification will provide a simple programming model for data that supports best-practice application design patterns, and will be amenable to tools and frameworks that will provide even greater developer productivity. Work Manager for Application Servers -- Provides a simple API for application server-supported concurrent execution of work items. This enables J2EE-based applications (including Servlets and EJBs) to schedule work items for concurrent execution, which will provide greater throughput and increased response time for applications. Timer for Application Servers -- Provides a simple API for setting timers in an application server-supported fashion. This enables J2EE-based applications (including Servlets, EJBs and JCA Resource Adapters) to schedule future timer notifications and to receive timer notifications.