WildFly 10 is also using javassist 3.18.1-GA. I expect that 3.18.2-GA will work for us and it has a little more Java 8 support.
We should also talk soon about javassist 3.20.x versus 3.18.3-GA. If we choose to use 3.18.3-GA, we need to do some work to create it. If 3.20.0-GA is just as compatible, we could consider using that (or even 3.21.0-GA which isn't out yet.)
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