With 3.7 there is nothing you need outiside of copying jars of ReportEngine/lib to your classpath (web-inf/lib). What you are running into most likely is that you are still using the 1.3 report-server code which is not compatible with Birt 3.7. We are fixing this now as part of the jbpm-installer AS7 upgrade. Will update here when its changed in (remind me too if you don't hear anything in the next couple of days).