Likely this response is far too late to be of use. However, my current application does use the Spring JCR Module with Alfresco. I ended up writing my own interceptor since my application resides within a JSR 168 portlet. Other than that, the module appeared to function fine. I don't think Alfresco has to officially support the Spring JCR Module, as the module itself is written against the JCR specification. However, bear in mind that there can be a great deal of variance when it comes to JCR implementations. Alfresco's implementation, while complying with the specification, leaves a great many optionals unimplemented. If you take a look at some of these optionals, it is likely that you will find a few that you have to have… which Alfresco has yet to implement.