It's recommended to use the 1.8 version, according to our supported platforms, sir.
Hi Vikas,
In addition to Giuliano's Answer, in our local tests, we couldn't even start Confluence 5.8 using a JDK 1.7. So definitely you must use the JDK 1.8 to use Confluence 5.8.
Cheers,
Rodrigo
Just check, got the the answer.
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