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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 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. uPortal 4.0.14+: For prioritizing results for the ajax search autocomplete feature (see searchAutocompletePriorityMap in bean https://github.com/Jasig/uPortal/blob/master/uportal-war/src/main/resources/properties/contexts/servicesContext.xml and Configuring Search).
6. Call EventResponse.setEvent to send the results back to the search portlet
7. 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