src/main/java/org/apache/commons/collections4/list/AbstractLinkedList.java [624:633]:
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    protected void addNode(final Node<E> nodeToInsert, final Node<E> insertBeforeNode) {
        Objects.requireNonNull(nodeToInsert, "nodeToInsert");
        Objects.requireNonNull(insertBeforeNode, "insertBeforeNode");
        nodeToInsert.next = insertBeforeNode;
        nodeToInsert.previous = insertBeforeNode.previous;
        insertBeforeNode.previous.next = nodeToInsert;
        insertBeforeNode.previous = nodeToInsert;
        size++;
        modCount++;
    }
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src/main/java/org/apache/commons/collections4/list/AbstractLinkedListJava21.java [616:625]:
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    protected void addNode(final Node<E> nodeToInsert, final Node<E> insertBeforeNode) {
        Objects.requireNonNull(nodeToInsert, "nodeToInsert");
        Objects.requireNonNull(insertBeforeNode, "insertBeforeNode");
        nodeToInsert.next = insertBeforeNode;
        nodeToInsert.previous = insertBeforeNode.previous;
        insertBeforeNode.previous.next = nodeToInsert;
        insertBeforeNode.previous = nodeToInsert;
        size++;
        modCount++;
    }
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