We’ve noticed that MyEclipse’s deployment mechanism fails when attempting to deploy projects containing a dot (.) to JBoss 4.x. For example, if I have an EJB project named ‘My EJB Project’ MyEclipse will happily deploy it to ‘My EJB Project.jar’ and JBoss deploys it just fine. However, if I rename the project to ‘My EJB Project 1.0’ MyEclipse deploys it to ‘My EJB Project 1.0’ and fails to append the ‘.jar’ extension. JBoss is looking for the extension to decide what to deploy, so it fails.