Difference between JSR 168 and JSR 286 portlets

1. Inter portlet communicaiton (IPC)  - IPC through events and public render parameters

2. Support for WSRP 2.0

3. Public render parameters – allowing portlets to share parameters with other portlets.

4. Portlet filters and listeners.

5. Resource serving - Provide ability for portlets to server a resource

6. AJAX support

Apart for these major differences,there are many minor changes like

1.       getNamespace() – this method gives unique value for the portlet window

2.       getWindowsIDb

3.       Portlet Cookies- Can beset  on particular phase and retrieved on the subsequest phase

4.       Additions to PortletRequestDispatcher

5.       Portlet container runtime options

6.       New CSS classess