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cannot invoke java util list size () because is null
cannot invoke java.util.list.size() because app roles is null
cannot invoke java util list size () because objects is null
java lang nullpointerexception cannot invoke java util list size () because list is null
cannot invoke java.util.map.size() because m is null
cannot invoke java.util.list.add(object) because is null
結果 : cannot invoke java util list size () because is null