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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Types of portlet solution vertical domains and technology like collaboration, social networking, community, content management, utility, calendaring, HRM all are available in these catalogs.
This implementation means that changing a render parameter, for example, requires an update of all the URLs on the page, which the portal cannot perform, as the processing of the response data on specififation client is done entirely by the portlet. At runtime, a filter chain of all the filters is applied to the portlet.
JSR is the Java Portlet specifjcation v2.
Therefore, you need to provide this information in the portlet. The only way to share data between the portlet and the servlet is to use the application-scope session or the parameter on the URL that invokes the servlet.
Java Portlet Specification – Wikipedia
View image at full size. You can see that the Ajax calls go through the portal servlet and thus are under the control of the portal.
As mentioned before, the model is a loosely coupled model where the portal application acts as broker between the different portlets and distributes the events.
This addition means that you can specificagion dispatch to action or event logic written in a servlet, or you can do forwards when serving resources try to forward to the resource ID that you have set on a ResourceURL.
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. You can find a complete list of the members of the expert group here.
What’s new in the Java Portlet Specification V2.0 (JSR 286)?
JSR is the Java Portlet specification v3. Java enterprise platform Java specification requests Web portals. Note that if you use a container runtime option and the container on which your portlet is deployed does not support this option, the container may reject the deployment of the portlet.
Therefore, the JSR specification lets you indicate for which portlet modes the portal should display UI controls as part of the render response using the method setNextPossiblePortletModes. To receive events you need either to extend GenericPortlet or to implement the EventPortlet interface yourself.
Java Portlet Specification
On the other hand, you may want to respond quickly to changes in your back-end system and provide an updated view of the portlet. The GenericPortlet class does the rest for you. JSR specifications offer suitability to the developers to reuse the code to maintain a set of JSR compliant portlets.
Instead, you needed an additional servlet that served the resources. Subscribe To Posts Atom. Sign in or register to add and subscribe to comments. If the returned content is not user specific, you should additionally set the cache control to public scope.
A portlet is managed by a protlet container.
Thus, you can issue XmlHttpRequests to ResourceURLs and, on the server side, get complete access to the portlet context such as render parameter, portlet mode, window state, portlet preferences, and portlet session. A portlet container contains portlets and manages their life cycles. A portlet responds to requests from a web client with and generates dynamic content.
The following are important Specification and Features. Resource URLs trigger the lifecycle method, serveResource, on the ResourceServingPortlet interface that you can leverage to create dynamic resources directly in the portlet.
Defining a public render parameter is very similar to defining an event: Here Portlets catalog are of use.
An example is a programmatically generated SVG view that depends on the portlet preferences for back-end access. Let’s take a deeper look into the new features for extending the Java Portlet Specification in the next sections. About Me Meera Prince. Therefore, use them with care. Public render parameters allow sharing of request parameters across different portlets or other artifacts, like themes or portal pages in IBM WebSphere Portal.
Portlet 1 defines that it can publish some event A in its portlet. Generally if any portlet is have in action page other portlet need to render the portlet within the page. Create a file called setenv The important point here is to set the portal-managed mode to false. These hook points, though, come with a cost, especially the request lifecycle listeners, which add significant processing overhead for each request.
The portlet programming model now provides you with events and public render parameters so that you can build larger composite applications out of your portlets and reuse your portlets in different scenarios. We simply send Ajax call from portlet so that we can communicate with server then get the response.
You now need to include the new tag library with: We will provide early public drafts in order to get public feedback as early as possible. As a result of this action, the portlet issues event A.