Inter-portlet communication is the ability of one portlet to communicate with another portlet. This is one of the most important feature when we talk about portlets and portals. Looking to its importance many portal vendors have provided their own specific api's to achieve inter-portlet communication but this is something JSR 168 is missing and have to work on it before releasing next version. As per now to achieve inter-portlet communication in JSR 168 the developers are storing data in session at application scope level or storing it at portal level.
Developers are also using Ajax for acheiving inter-portel communication. In my last project I have used Ajax to achieve inter-portelt communication between the portlets.
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