For performance Golang 1.5 is a beast. Yes, earlier version where slow(er) of ron par w/ Java. But 1.5 is just blisteringly fast.
The Golang maintainers put for a conscience effort to keep performance high. That means every new release will have perf. enhancements. I can not speak to Oracles drive for performance within Java.
Opinion: If I have to choice between golang and java/spring; Golang would win out. Especially for HTTP/S API's.
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