At least for designer 2.0, I had to copy the following files to designer's WEB-INF/lib to deploy it into tomcat:
Hope this helps,
I tried copying the jars and it didn't make any difference. Thanks though
I was doing this last night on a Tomcat6 and once I had the context-root of guvnor renamed to drools-guvnor, my processes showed up fine in the editor. I did not have to install any jars to the WEB-INF/lib file.