A normal strategy for this would be to have a test environment that you would upgrade first. Preferably the test environment would be as close as possible to being a complete replica of production.
And then you test your application. That's really the only way to be sure that "they should not be asked to downgrade to the older version for any reason".
BTW, I recommend targeting JBoss 7.1.1 rather than 7.1.0.