api/src/main/java/jakarta/faces/component/behavior/_DeltaStateHelper.java [840:886]:
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    private static Object restoreAttachedState(FacesContext context, Object stateObj) throws IllegalStateException
    {
        Assert.notNull(context, "context");

        if (stateObj == null)
        {
            return null;
        }
        if (stateObj instanceof _AttachedListStateWrapper wrapper)
        {
            List<Object> lst = wrapper.getWrappedStateList();
            List<Object> restoredList = new ArrayList<Object>(lst.size());
            for (Object item : lst)
            {
                restoredList.add(restoreAttachedState(context, item));
            }
            return restoredList;
        }
        else if (stateObj instanceof _AttachedStateWrapper wrapper)
        {
            Class<?> clazz = wrapper.getClazz();
            Object restoredObject;
            try
            {
                restoredObject = clazz.newInstance();
            }
            catch (InstantiationException e)
            {
                throw new RuntimeException("Could not restore StateHolder of type " + clazz.getName()
                        + " (missing no-args constructor?)", e);
            }
            catch (IllegalAccessException e)
            {
                throw new RuntimeException(e);
            }
            if (restoredObject instanceof StateHolder holder)
            {
                Object wrappedState = wrapper.getWrappedStateObject();
                holder.restoreState(context, wrappedState);
            }
            return restoredObject;
        }
        else
        {
            return stateObj;
        }
    }
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api/src/main/java/jakarta/faces/component/behavior/BehaviorBase.java [195:241]:
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    private static Object restoreAttachedState(FacesContext context, Object stateObj) throws IllegalStateException
    {
        Assert.notNull(context, "context");

        if (stateObj == null)
        {
            return null;
        }
        if (stateObj instanceof _AttachedListStateWrapper wrapper)
        {
            List<Object> lst = wrapper.getWrappedStateList();
            List<Object> restoredList = new ArrayList<>(lst.size());
            for (Object item : lst)
            {
                restoredList.add(restoreAttachedState(context, item));
            }
            return restoredList;
        }
        else if (stateObj instanceof _AttachedStateWrapper wrapper)
        {
            Class<?> clazz = wrapper.getClazz();
            Object restoredObject;
            try
            {
                restoredObject = clazz.newInstance();
            }
            catch (InstantiationException e)
            {
                throw new RuntimeException("Could not restore StateHolder of type " + clazz.getName()
                        + " (missing no-args constructor?)", e);
            }
            catch (IllegalAccessException e)
            {
                throw new RuntimeException(e);
            }
            if (restoredObject instanceof StateHolder holder)
            {
                Object wrappedState = wrapper.getWrappedStateObject();
                holder.restoreState(context, wrappedState);
            }
            return restoredObject;
        }
        else
        {
            return stateObj;
        }
    }
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