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1. See the searchContent method in https://github.com/Jasig/SimpleContentPortlet/tree/master/src/main/java/org/jasig/portlet/cms/mvc/portlet/SearchContentController.java
2. Here is where the work happens, EventRequest.getEvent() returns a SearchRequest
3. SearchRequest specified the search terms that where were specified, your portlet should use these to do its searching
4. If there is a hit create a SearchResults object, copy over the queryId, set the windowId, for each result create a SearchResult and set title/summary.  Set the type to a string relevant to your portlet.  The type is used to determine which tab to display the results on (as determined by map "searchTabs" in bean https://github.com/Jasig/uPortal/blob/master/uportal-war/src/main/resources/properties/contexts/servicesContext.xml)
5. Call EventResponse.setEvent to send the results back to the search portlet
6. This example is Spring 3.x specific but it can be doing using the plain-old portlet 2 APIs as well

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List of Apereo Portlets Already Integrated with the uPortal Search API