Brice,
To get started with XDoclet (this is a bit confusing sometimes) you need to add an XDoclet builder to your project. You can do this by selecting your project root folder, right clicking, going down to Properties, then selecting MyEclipse-XDoclet. From here, in the top-right panel, you can right click and then select “Add” to start adding XDoclet builders. These builders will be run when you “build” your project.
For example, I am working on a Hibernate project now, so the only builder I have in that window is the “Standard Hibernate”. Some people do a lot of EJB work, so they add the “Standard EJB” one.
Please let us know if you have futher questions and I can sick our XDoclet guy on this thread to help.