Inter portlet communication between portlets across pages

In order to provide coordination between portlets the Java Portlet Specification, JSR 286 introduces Eventing and Public Render Parameters

Eventing:

By default portlets can send and receive events with other portlets that are on the same page. This can be changed to enable portlets to send and receive events from other portlets that are on different pages. This can be done by adding the following property in portal-ext.properties in Web Space server and Liferay Portal 5.2.x.

portlet.event.distribution=ALL_PORTLETS



Public Render Parameters:

By default portlets can share render states with other portlets that are on the same page. This can be changed to enable portlets to share render states with other portlets that are on different pages. This can be done by adding the following property in portal-ext.properties in Web Space server and Liferay Portal 5.2.x.

portlet.public.render.parameter.distribution=ALL_PORTLETS