In Google's most recent cache, the efreedom result has the word "pass" on the page due to some related links content near the bottom, whereas the stackoverflow page does not. If you modify your query to [parse json body to spring mvc], stackoverflow is at position #1, and efreedom is at position #4. This still has room for improvement, but it would seem like the simplest explanation is just the better match on your query terms.
Didn't notice that - that's good to know. That's actually exactly how I'd expect a good search engine to behave. As annoyed as I am when I get a junk result, I'd be even more pissed if Google dropped terms from my query just so it can return a more popular site.
Of course, then all the content-copy farms will respond by copying valid content plus word lists - hopefully Google knows how to detect that.
