Singling Out to Spring

Last time, I wrote about why Singletons get a bad rap, and I wrote some high-level advice for moving away from them sanely. I want to cover a practical (if somewhat idealistic) example using Java and Spring to move a Singleton creation dependency out of a class.
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Singled Out

One of my colleagues blindsided me the other day with a question about software architecture that I should’ve been able to answer on the spot: “Are singletons really all that bad?”
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Annotation Processing and the Pernicious // TODO

Raise your hand if you’ve ever put a // TODO comment in your source code. Or // FIXME, // XXX, or any of the thousands of other variants programmers have been using since before there was dirt to mark places that need further work.

Now raise your hand if your compiler or build tool can tell you about them.
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