Which events are supported by JSR-286 portlets for inter-portlet communication?

JSR-286, which is also known as the Portlet 2.0 specification, defines a framework for creating portlets in Java. One of the key features of this specification is the ability for portlets to communicate with each other through events. Among the types of events outlined, publishing events is a critical component that enables this communication.

Publishing events allow a portlet to send an event to a channel where other interested portlets can listen for and process these events. This mechanism encourages a decoupled architecture, as portlets do not need to be directly aware of each other – they only need to be aware of the event interface. This leads to greater modularity and flexibility in the development of portal applications, allowing for more interactive user experiences.

The other types of events, while mentioned in the context of portlet communication, are not directly tied to the JSR-286 definition of inter-portlet communication. Processing events refer to the action of handling events once they are received, but do not themselves represent a form of communication. Global events imply a broader scope that may extend beyond the context of JSR-286, while lifecycle events pertain to the management of the portlet’s lifecycle instead of inter-portlet communication.

Thus,