Welcome!

Marcel Heijmans

Subscribe to Marcel Heijmans: eMailAlertsEmail Alerts
Get Marcel Heijmans via: homepageHomepage mobileMobile rssRSS facebookFacebook twitterTwitter linkedinLinkedIn


Top Stories by Marcel Heijmans

A three-letter acronym seen a lot recently is EAI (Enterprise Application Integration). EAI deals with the question of how to create a coherent enterprise system infrastructure within a heterogeneous application environment. One of the effects of mergers and the lack of standards for system integrators is the enormous amount of work it generates to glue all the parts of merging enterprises together. The major challenge is to do this in a logical manner while avoiding inconsistencies. The aspect of EAI that I want to focus on is security, specifically the authentication and authorization of users. The J2EE platform requires user information in order to authenticate a user or group of users and to authorize access to a J2EE component or a Web resource. However, there is no consensus on where or how to store employee or customer information. Databases, LDAP (Lightweig... (more)

Skin Deep

The look and feel of a WebSphere Portal site is determined by the definition of themes and skins. This might give you the impression that themes and skins are mere window dressing and hence the domain of interaction designers and graphic designers. The WebSphere Portal page renderer, however, constructs its portal pages on the logic defined in the JavaServer Pages (JSPs) of the themes and skins. This means that themes and skins are capable of more function than just determining the look and feel of a portal page through cascading style sheets and images. WebSphere Portal develope... (more)

Message-Driven Beans and WebSphere 4.0

One of the major innovations in the EJB 2.0 specification, the Message-Driven Bean (MDB), is not supported by WebSphere Application Server 4.0. There are several ways to circumvent this shortcoming - you can wait for WAS 5.0, use another application server, or concoct some sort of pseudo MDB. Since the first two are rarely feasible, I'll describe the last. The Java Message Service (JMS) provides the means for asynchronous communications via Message-Oriented Middleware (MOM). In a J2EE environment, with Enterprise JavaBeans, JMS can be used to produce messages asynchronously. Howe... (more)