"They have just returned from travelling to Malaysia and Bali," he said here on Thursday.
He said the four residents who have contracted coronavirus infection are undergoing treatment at Sulianti Saroso and Persahabatan hospitals in Jakarta which serve as referral hospitals for people with positive coronavirus infection.
The governor asked local residents to avoid public gatherings and try as far as they can to not travel to countries hit by coronavirus outbreak.
"I hope the public not to panic. They should remain vigilant, always keep their health, wash their hands with soap, consume nutritious food, take enough rest and always do exercise," he said in a press statement.