Here is the proof:

vv.getRenderContext().setVertexLabelTransformer(MapTransformer.<Number,String>getInstance(
LazyMap.<Number,String>decorate(new HashMap<Number,String>(), new ToStringLabeller<Number>())));


Update: I’ve found a better example.

From freenode ##java:

10:13 < DRMacIver> cybereal: Oh, I figured out how to work around the Java type system to make my generators work. It requires a bit of a rearchitecture though.
10:13 < DRMacIver> It’s blatant and malicious evil I’m afraid. :)
10:13 < cybereal> That seems to be the way of things for you lately