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Summary. Service discovery deals with locating services which can be used to accomplish a task. For example discovering a printer to print documents on, or locating a shop offering the service of hairdressing. When you locate a service you usually obtain an address which you use to invoke the o.ered service. Here in this chapter we will start by looking at an example of service discovery from human life, with a short story of a pizza restaurant which o.ers the service of baking pizzas and see how customers can discover it. Next, we will have a look at how those methods from the pizza-story can be applied in computer networks. Finally, an introduction to UPnP is given as an example of a service discovery system. [ABSTRACT FROM AUTHOR]

Java technology is an object-oriented programming environment created by Sun Microsystems. The main goal was to offer an environment to develop platform-independent applications following the slogan write once, run anywhere. Today Java is one of the most popular software developing environment. It offers the opportunity to create enterprise applications for server and desktop computers as well as applications for small and mobile devices. To get familiar with J2ME technology for mobile application development, let us start with exploring the overall Java family first. As shown in Figure 3.1, Java has been split up in 4 distinct editions 3: [ABSTRACT FROM AUTHOR]