Question about OBE's role in sourceid-java-2.0

I am continuing my work on port sourceid-java-2.0 demo application to 
tomcat, for I believe, if succeeded, many servers can run sourceid's 
idff1.2 (instead of ONLY jboss).

On compiling CastlePeak/Infranstructure package, there is only one place 
that needs jboss( and it is easy short circuited). While running, the 
OBE(Open Bussiness Engine) package requires j2ee support. Meanwhile, I 
found that org.sourceid.workflow package in Infrastructure also depends 
on OBE

Here is my question:
1. What is the role of OBE in sourceid-java-2.0? In other words, can I 
tear obe off easily so that it can run in tomcat (for example, although 
compiled with OBE, I could never use those functionalities depend on OBE)
2. There must be some changes in Demo. I have two choices: modify the 
existing demo application, or re-write a new simple one. Which choice is 
easier?

Thanks in advance.