Police were called at 1:30 p.m. to SP2 Communal Bar + Restaurant on Almaden Avenue in San Jose, which is near San Pedro Square.
Investigators say two of the men were taken to the hospital .
All four are expected to be OK.
Officers say there was an argument before the stabbing, but haven't said what that argument was about.
So far, investigators say they have few details about a suspect and they have to get more information from the victims.