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Which methodology is JSF using to access HashMap values in the view? I know the way to get HashMap value by using the EL Expression #{bean.map.key}, but I am curious as to how it works under the covers.
This is not part of JSF. This is part of EL. EL has some default resolvers. One of them is the
MapELResolver. You can of course homebrew your own and register it via<application><el-resolver>.