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The scrum-half announced his international retirement earlier this week, but will pull on a BaaBaas jersey for the first time in his career this summer in the Killik Cup clash against Fiji at Twickenham.
JJ will join Zach Mercer and Ben Youngs running out in the black-and-white stripes at Twickenham.
Remember 1973? That match? THAT try?! Watch the much-loved and much-missed Phil Bennett as he recalls one of the greatest moments in Babarians history.
Go behind-the-scenes with the Barbarians and Rugby Pass
Barbarians v New Zealand in another epic clash
History makers. Behind the scenes with our women's team
Australia v Barbarians action from Allianz Stadium in Sydney
The 2016 squad take on the Barbarians crossbar challenge!
The 2017 Wembley wizards – Barbarians 31 South Africa 31
Exclusive: Inside the camp with the Baa-baas at Twickenham