Java 8 compatibility

Change-Id: Ie37283e2d2f632eb07b35938803964012898802b
Reviewed-on: https://pirx.atteo.com/gerrit/569
Tested-by: Mr. Jenkins
Reviewed-by: Sławek Piotrowski <sentinel@atteo.com>
Add info about benchmark

Change-Id: I55b635a530b7f8bb929fb72b5a852bd2c3b4a44a
Reviewed-on: https://pirx.atteo.com/gerrit/570
Tested-by: Mr. Jenkins
Reviewed-by: Sławek Piotrowski <sentinel@atteo.com>