It appears as if SpringSource, the company doing most of the development of Spring, is doing an ExtJS, i.e. changing the license of its product to force users into paying for it, or its support. Lots of people are writing about this, such as Alessandro Santini at JavaLobby. Does anyone have any enlightening comments?
Regardless, I think it is now up to the community to start asking the maintainers of various emerging frameworks explicitly if they in the future will change its license. If they slipper and slide on the answer, then we know we’re in for a rough awakening.