My first guess is to open db that guvnor is storing data in. Than look for table with jars:) delete row with Your import. I dont know how guvnor internaly works but i dont believe it stors imports on disk.
Thanks, Adam! Originally, using Guvnor GUI, I wanted to uploaded two jars from our partner products, which I cannot change the contents. Also, the jars depend on many, many other jars including third-party jars - I know the jars are not well-defined DTO. I think the way Guvnor compiles the uploaded jars is different from the compilation of jars on the system classpath. To, me Guvnor tries to import every single class refereneced in the jars. I am not saying it is wrong.
So, instead, we put the two jars in the app server classpath where the Guvnor is running. Then, there is no compilation error. It may not dynamic as using Guvnor upload jars. for now.... If any one has a better idea, please let me know.