Most likely you need to build simple bridge beans between 3.0 and 3.2
where can I read how to build a bridge bean?
I haven't seen any documentation on this.
Idea is simple, you build a component that acts as the server side for your 3.0 clients and itself is the client to further invoke a 3.2 server side component.
The tricky part is in the details, how to isolate the java libraries so that there won't be overlap between the 3.0 and 3.2 class libraries.