EDIT

    @Override

    public int hashCode() {

        final int prime = 31;

        int result = 1;

        result = prime * result + ((taxonNode == null) ? 0 : taxonNode.hashCode());

        result = prime * result + ((uuidAndTitleCache == null) ? 0 : uuidAndTitleCache.getUuid().hashCode());

        return result;

    }

    @Override

    public boolean equals(Object obj) {

        if (this == obj) {

            return true;

        }

        if (obj == null) {

            return false;

        }

        if (getClass() != obj.getClass()) {

            return false;

        }

        SpecimenNodeWrapper other = (SpecimenNodeWrapper) obj;

        if (taxonNode == null) {

            if (other.taxonNode != null) {

                return false;

            }

        } else if (!taxonNode.equals(other.taxonNode)) {

            return false;

        }

        if (uuidAndTitleCache == null) {

            if (other.uuidAndTitleCache != null) {

                return false;

            }

        } else if (!uuidAndTitleCache.getUuid().equals(other.uuidAndTitleCache.getUuid())) {

            return false;

        }

        return true;

    }