Java™ Portlet разработка с JSR 286: Portlet 2.0 API & Liferay® – JSP™, Spring MVC, JSF & AJAX Portlets (1 модул, 40 учебни часа)
In order to cope with the challenges of contemporary business environment including globalization, economical pressure for better efficiency, business process outsourcing, achievement of regulatory compliance, the enterprise needs improved support by technology. Recently the term Service Oriented Architecture (SOA) has become a pervasive buzz word together with Cloud Computing, Software as a Service (SaaS), etc. The SOA standards like: Simple Object Access Protocol (SOAP), Web Services Description Language (WSDL), Representational STate Transfer (REST), Web Application Description Language (WADL) have emerged and matured. But from the end user perspective all these technologies do not matter much.
In 2002 the Java™ community started a pioneering effort for standardization of the web-based presentation services as well. They were called portlets and were able to be easily combined and integrated into enterprise portals based on a common standard defining their interaction – JSR 168: Java Portlet Specification. In 2005 it was followed by another more advanced specification – JSR 286: Portlet Specification 2.0.
Portals offer many advantages over other software applications. First, they provide a single access point for all employees, partners, and customers. Second, portals provide access to business functionality transparently from any device in virtually any location. Third, portals are highly flexible; they can exist in the form of B2E intra-nets, B2B extra-nets, or B2C inter-nets. Fourth, portals can be combined to form a portal network that can span a company’s ecosystem. Fifth, because they provide front end for different web services they can easily integrate existing heterogeneous software systems and are future proof.
The Java™ Portlet technology ( JSR 286: Portlet 2.0) allows easy sharing and combination of web applications developed by different organizations and individuals in a personalized enterprise portals. New “portlet-based” web application development style has emerged. A brief description for portlet in SOA (Service Oriented Architecture) style is: “presentation-oriented web service”. Portlet apps (PA) are more distributed, flexible and agile, compared to older style, monolithic web applications we know for years. PA can use asynchronous data requests and can be dynamically updated in response (and sometimes in anticipation) to user’s needs. They are typically consisting of several different portlets that communicate using shared parameters or publish/subscribe events according to latest Portlet 2.0 Specification (JSR-286). Liferay is a state-of-the-art open-source Enterprise Portal Server licensed under LGPL, which was integrated by Sun in their portal server.
In order portlet technology to become even more successful are needed developer frameworks and tools that support rapid portlet application development and reuse of components. As part of Java™ Enterprise Edition standardization process and as a recommended technology for web based presentation in the latest version of Java EE 6, Java Server Faces (JSF) framework became most promising candidate for such an enabling technology. Among the advantages of JSF are:
- easy construction of UI from a set of reusable components;
- clear separation between data and presentation using MVC design pattern;
- easy to use model for wiring client-generated events to server-side application code;
- UI components state managed automatically across client requests;
- separation of concerns between corporate developers and system programmers.
The latest version of JSF 2.1 provides additional advantages:
- more flexible and standard based presentation components using facelets;
- easy to use view/page templating;
- easy to create custom components without Java programming by composing existing components;
- seamless and unified integration with all different types of beans (ManagedBeans, POJO, EJB) using dependency injection annotations;
- new scopes (e.g. conversation scope, custom scopes);
- bookmarkable application states using view parameters;
- partial view processing and rendering during ajax requests;
- easier configuration, navigation and resource loading.
JSF technology provides many nice capabilities simplifying the development Â process, but there are some problems using JSF directly for portlet development. The most important one is the difference in lifecycles of portlets and JSF components – portlets separate action, event, resource and render requests, while standard JSF servlet handles them in a common request processing lifecycle. That is why a bridge between two technologies is needed in order to combine their advantages. Two new specification requests (targeted towards different versions of the portlet specification) were published to address this need – JSR 301: Portlet 1.0 Bridge for JavaServer™ Faces 1.2, and JSR 329: Portlet 2.0 Bridge for JavaServer™ Faces 1.2 Specification.
The course will present the details of Java portlets development using different web presentation technologies:
JSF 1.2 technology (including JSR 301 and JSR 329 open source implementations)
The course will also provide insight about emerging initiatives for development of Portlet 2.0 to JSF 2.1 bridge (no specification available yet) and practical development of portlets accessed through Web Services for Remote Portlets (WSRP) OASIS network protocol specification allows the portlets to be accessed remotely and combined easily by third party portals and consumers, supported by all of the portal market’s major players, including Oracle®, IBM®, Microsoft®. The ultimate goal of WSRP is to bring the benefits of Service-Oriented Architecture to the end-user.
Practical examples using open source technologies will be demonstrated and developed by participants illustrating the concepts, and proving the value of the technologies. Participants will develop solutions to multiple problems and home work tasks with opportunity for individual consultation with the trainer. The implemented applications will be deployed on Liferay 5 and 6 state-of-the-art open-source enterprise portal servers.
Ideally, the course participants should have previous knowledge and practical experience in Java Web programming technologies (JSP™, JSF, AJAX) that will be discussed during the course.
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