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A teacher told a colleague of his frustration at being unable to control his classes the day before attacking a pupil, a court has heard.Peter Harvey, 50, denies the attempted murder of a boy at All Saints' Roman Catholic School, Mansfield, while trying to restore class discipline.
The boy, 14, suffered a fractured skill when he was hit with a dumbbell.
A fellow teacher told Nottingham Crown Court Mr Harvey said he was finding it difficult to keep order.
David Hopwood described Mr Harvey as "a professional" and "really well respected".
'Warm and kind'
He told the court: "The day before the incident took place, I can remember having a conversation with him when he said he was finding it odd because, for the first time in 20 years, he was finding it difficult to keep the same order in the classroom because it had always been excellent.
"I think there were times when he expressed his frustration at the children because he was finding it difficult to control them, to get them to do what he wanted."
He added: "He had good ideas for teaching lessons and he was really warm and kind - a really good bloke."
The court previously heard in July last year Mr Harvey dragged the boy into another room and beat him with the 3kg (6.6lb) dumbbell while shouting, "Die, die, die".
Mr Harvey denies attempted murder and causing grievous bodily harm with intent, but has admitted a charge of causing grievous bodily harm.
Jurors have heard that the victim was regularly in trouble for disrupting lessons and classmates filmed students calling Mr Harvey a "psycho" in the moments before the attack.
Witnesses earlier told the court Mr Harvey dragged the boy out of the "noisy and rowdy" classroom and carried out the attack "as if possessed".
The trial continues.This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.