If it's a library, not an app, it's better not to rely on DI at all, leaving the choice of container to user. As a library designer you can implement reasonable

If it's a library, not an app, it's better not to rely on DI at all, leaving the choice of container to user. As a library designer you can implement reasonable manual auto-wiring of default configuration. For small applications (both server-side and client-side) Spring 4 is as easy to use as Guice.