How do we prevent child violent?

I were told by my child form teacher that my 7 year old boy has been quite violent to his classmates. The teacher have received feedback from 2 of his classmates that my son kicked them in the legs and stomach respectively. Also used a ruler to scratch another classmate. My son got angry when he was scolded for not being pleasant to his classmate and ran out of the classroom. How do we reinforce good behaviour/manners/habits for his own good. So that he could understand the importance of these good values in forging good friendship with his classmates. Its easy said then done. Do you think there's a need to bring him for a counciling session? If it were your child what will you do?