src/main/java/org/apache/commons/beanutils2/PropertyUtilsBean.java [572:594]:
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        Objects.requireNonNull(bean, "bean");
        Objects.requireNonNull(name, "name");
        // Resolve nested references
        while (resolver.hasNested(name)) {
            final String next = resolver.next(name);
            Object nestedBean = null;
            if (bean instanceof Map) {
                nestedBean = getPropertyOfMapBean((Map<?, ?>) bean, next);
            } else if (resolver.isMapped(next)) {
                nestedBean = getMappedProperty(bean, next);
            } else if (resolver.isIndexed(next)) {
                nestedBean = getIndexedProperty(bean, next);
            } else {
                nestedBean = getSimpleProperty(bean, next);
            }
            if (nestedBean == null) {
                throw new NestedNullException("Null property value for '" + name + "' on bean class '" + bean.getClass() + "'");
            }
            bean = nestedBean;
            name = resolver.remove(name);
        }

        if (bean instanceof Map) {
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src/main/java/org/apache/commons/beanutils2/PropertyUtilsBean.java [1445:1467]:
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        Objects.requireNonNull(bean, "bean");
        Objects.requireNonNull(name, "name");
        // Resolve nested references
        while (resolver.hasNested(name)) {
            final String next = resolver.next(name);
            Object nestedBean = null;
            if (bean instanceof Map) {
                nestedBean = getPropertyOfMapBean((Map<?, ?>) bean, next);
            } else if (resolver.isMapped(next)) {
                nestedBean = getMappedProperty(bean, next);
            } else if (resolver.isIndexed(next)) {
                nestedBean = getIndexedProperty(bean, next);
            } else {
                nestedBean = getSimpleProperty(bean, next);
            }
            if (nestedBean == null) {
                throw new NestedNullException("Null property value for '" + name + "' on bean class '" + bean.getClass() + "'");
            }
            bean = nestedBean;
            name = resolver.remove(name);
        }

        if (bean instanceof Map) {
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