Here's a little blog post about Redline Java interop
http://www.redline.st/blog/2012/11/20/automatic-java-class-i...
Short story:
import: 'com.friendly.Greeting' as: 'Greeter'.
Greeter new say.
For piecemeal migration from Java to Smalltalk being able to compile a class to an existing interface is key since once you have that you can just plug it into the Spring context of any existing Java app and slowly migrate from there.