Today I started trying this tool, installing the .WAR files into a Geronimo Application Server 3.0.1 (OSGi).
I noticed that them were installed without any error, but the url assigned to each application was wrong.
As an example, inspecting WEB-INF/web.xml at activiti-explorer.war, I found the tag id="WebApp_ID", and that is the URL that the Geronimo used to build the URL of this application (same with activiti-rest.war).
The problems are: 1. Wrong url name (http://localhost:8080/WebApp_ID 2. Same problem when you install activiti-rest which start an URL address conflict.