Learn all about the second version of the Java Portlet Specification (JSR ). In Version , the specification and the APIs more than doubled. The Java Portlet Specification addresses the requirements of aggregation, was approved by the Java Community Process in March as JSR This tutorial on JSR development provides an introduction to portlet programming as the reader is taken through the creation of a simple HelloWorld portlet.
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In the first version of the Java Portlet Specification, the portlet could not contribute to sections of the portal page outside its portlet window. An example is the Java Portlet Specification. A JSR portlets catalog makes sure that portlets under this catalog may run on any standards—compliant Java portal server.
Java Portlet Specification – Wikipedia
The second version tackles these issues and provides solutions so that the portlet programming model has nearly the same capabilities as the servlet one, plus the portlet specific extensions. The portlet container can then provide you with this ETag in the request of the next render or serveResource call, indicating that it still has the cached content available, which can be revalidated. Please help improve this article by adding citations to reliable sources. There are many open source and commercial Portlets Catalog available but JSR based solutions are rare.
Here before portlet execute render phase it can send events to other portlets. Here Portlets catalog are of use. This setting indicates to the portal that it should treat this mode just like the standard View mode concerning all aspects, including how it provides the portlet with preferences and from the perspective of access control. As a result of not encoding any state of the page and portlets on the page, you cannot count on getting the current render parameters, portlet mode, or window state in your portlet.
Typically, connections are defined explicitly at page creation time, or they are automatically inferred by the portal at runtime. Event based mechanism way to communicate between portlet which are in same or in other page too. Because the markup returned from serveResource is not aggregated with other markup from the portal framework, the resource response allows full control over the output stream.
This markup is intended to be aggregated with other markup fragments into a larger application, for example, a portal page as shown in figure 1. In JSRthe portlet could leverage only portlet modes that are supported by the portal framework running the portlet. Public render parameters allow sharing of request parameters across different portlets or other artifacts, like themes or portal pages in IBM WebSphere Portal.
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Java Portlet Specification
The other mentioned materials will be taken into account to create a version 2. If you have portlets that are not customizable and don’t display different content for different users, such as a news-of-the-day portlet, then you get a cache entry for porglet user, even if all entries are the same. For action URLs, there is also the additional name attribute that allows you to set the javax.
This limitation had some disadvantages:. The Java Portlet Specification defines a contract between the portlet container and port,et and provides a convenient programming model for Java portlet developers.
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Now the Java Portlet Specification has grown up, and it allows you to implement most use cases without the need to have vendor extensions. It still requires that the portlet packages these resources in its WAR file in case the portal has not already loaded the resource.
Portlets are componentized user-facing applications that create some kind of markup. Generic Portlet Development using Liferay Plugins Listing 4 shows an example for a deployment descriptor entry. After the action and event processing have finished, the rendering lifecycle starts and the portlets can create new markup based on the state updates that occurred in the action and event specificatiom.
Why do we need this additional JAXB serialization? For example, the portlet can set a HTTP status code.
Standard portlet API
Java enterprise platform Java specification requests Web portals. To be determined by the expert group, initial target is to have a working EG by Decembera early public draft beginning ofa public draft by mid and a final version by end of The JSR tag library has its own namespace so jsf new additions do not interfere with portlets using the old JSR tag library.
User expand 2 liferay util 2 liferay. In the first version of the Java Portlet Specification, you had only the option of including servlets or JSPs from the render life-cycle call. Portlet Filter and Listeners.
The Java Community Process(SM) Program – JSRs: Java Specification Requests – detail JSR#
This restriction was sspecification because portlets are aggregated on a page and all concepts that assume that you are the only component on the page are not easily applied to the portlet programming model.
These extension points are:. The important feature in JSR is Inter portlet communication. Note that you need to set this list of modes on each response and that you should enable the container runtime hsr javax.
How do you know which back-end state the currently cached markup maps to?
These remote portlets may not be written in Java, and so we need a more general mechanism than the Java serialization. Let’s take a deeper look into the new features for extending the Java Portlet Specification in the next sections.
These hook points, though, come with a cost, especially the request lifecycle listeners, which add significant processing overhead for specifidation request.
A portlet is managed by a portlet container. If you want to provide the portlet with additional capabilities, set an object providing access to these capabilities as a request attribute. JSR specifications offer suitability to the developers to reuse the code portlwt maintain a set of JSR compliant portlets. Use these podtlet with care if you want to develop a portlet that can run on many different portlet container implementations.
You had only the ability to provide an additional servlet that serves the Ajax fragment. You can specify a dpecification QName for each event, or if you use the same namespace for many events, you can declare it as the default namespace and then specify only the local part of each event. It was released in June GenericPortlet also lets you use the following annotations to make dispatching life-cycle calls to specific handler code easier:.
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