Very rarely jain monks would fast unto death (sallekhana), but not set themselves on fire, as that would be considered a form of violence. And ahimsa (non-violence) is absolutely fundamental to Jainism. Sallekhana would be somewhat akin to maha-samadhi in Hinduism (where the person leaves their body after attaining samadhi). The Śramana (श्रमण) tradition is more common in Jains but can also be in Buddhists.