Here is the definitive guide/reference documentation to the Spring Framework, version 2.0 M5 release.

The authors and publisher are essentially the open source lightweight Spring Framework project team: Rod Johnson, Juergen Hoeller, Alef Arendsen, Colin Sampaleanu, Rob Harrop, Thomas Risberg, Darren Davison, Dmitriy Kopylenko, Mark Pollack, Thierry Templier, Erwin Vervaet, Portia Tung, Ben Hale, Adrian Colyer, John Lewis, Rick Evans, Costin Leau.