With the stress on that word, yes, you're expressing the subject's volition.
Without extra stress on that word, you're simply stating something that will happen in the future.
1. You will[wíl] have your own way.
2. He will[wíl] have his own way.
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Are the sentences grammatical?
Do we have to stress 'will' if we want to express the volition of the subject? If we do not stress 'will', what is the difference?
3 answers
In a written sentence, we cannot know whether it means the volition of the subject or not. In that case how can we distinguish the differene? By context?
Yes, when you're reading, only context will indicate those kinds of things.