JSR 286 portlet has introduced the event feature in it earlier in JSR 168 portlet spec, the only way to achieve eventing between portlets was through a portlet session. This was possible between portlets that are in the same web application. But in JSR defines a lifecycle for events, so that eventing is possible between portlets that are in different web applications.
(Ref: JSR286 portlet specification, Click here to download the full specification.)
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