Nowadays the web portals which are written in Java language are wide spread all over the world due to the varied usability of J2EE applications, the wide range of built in services and also the object oriented development.
During the preparation of such an application many existing and often used components and services can be applied, with which the development can be made faster and more effective, as well as with the help of these more attention can be paid to solve the specific task.
In the thesis my task is to plan and implement a real-estate searching and advertisement web application. In the course of this I show the details of the plan and implementation, the significant milestones and the technologies used. (EJB3, Spring MVC, Object-Relation Mapping). Besides the usual functions I make the data of the portal accessible for external clients (mobile phones), which makes it possible to develop mobile clients, who will be able to access to the functions of the portal.