What interface should be implemented to create a custom portlet in Liferay?

To create a custom portlet in Liferay, implementing the Portlet interface is essential. The Portlet interface is part of the Java Portlet API, which defines the standard methods and behaviors expected from any portlet. This includes handling requests and generating responses, managing the lifecycle of the portlet, and serving content to the user within a portal environment.

By implementing the Portlet interface, developers can create a functional portlet that Liferay can manage, allowing for the integration of dynamic content within a portal page. The core functionalities covered by this interface involve responding to user interactions (like rendering views and processing actions) and lifecycle methods like init, processAction, render, and destroy, which control how the portlet behaves within the Liferay framework.

The other options listed pertain to different concepts. The Widget option does not represent a standard interface within the context of portlet development in Liferay. The Component option is more general and typically relates to various components in software architecture, including managed beans or service components, but not specifically to portlet creation. Lastly, the Module option generally refers to the modular architecture in OSGi or Liferay’s Service Builder and is not directly tied to portlet development. Thus, for creating a custom portlet