Yes, it is possible: you just need to deploy the WAR file in your Liferay distribution or through the interface. Some time ago I wrote a portlet tutorial, created some JSR 286 compatibles, and deployed them. Perhaps they can help you . (Note, however, that to examine some of the properties of Liferay, these portlets do not have a web.xml descriptor β they will work in Liferay, but not elsewhere. Just add a descriptor if necessary.)
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