It seems I have to add the source for as3-commons-lang to my source path manually, if I want to use ClassUtils - even though I have all 3 SWCs (spring, logging and reflect) in my lib folder.

I get this little chestnut otherwise:

1046: Type was not found or was not a compile-time constant: [org.as3commons.lang]::IEquals

Funky stuff.. could be my Eclipse installation though.. she's giving me grief today!