Bieber's lawyer, Shawn Holley, entered the plea on the behalf of his client at Superior Court in Van Nuys, reported Ace Showbiz.
The 20-year-old Canadian pop star eventually was sentenced to two years of probation, ordered to attend a 12-week anger management program, take part in 5-day community labour and pay USD 80,900 in damages.
He is also ordered to stay at least 100 yards away from the said neighbour and his family for two years.
Bieber's camp has released a statement following the legal problem.
"Justin is glad to get this matter resolved and behind him. He will continue to move forward focusing on his career and his music," the statement read.
A hearing is scheduled for August 12 to check his progress.
A neighbour of Beiber in Calabasas claimed that the 'Baby' singer threw some eggs at his house in January. A few days later, police raided his house and took some videos from surveillance cameras around the house. During the search, Bieber's friend Lil Za was arrested for drug possession. Lil Za then was sentenced to probation and ordered to seek professional help.