Example of the equals(...) method generated by the JAXB2 SimpleEquals Plugin

PurchaseOrderType-equals.java

    public boolean equals(Object object) {
        if (!(object instanceof PurchaseOrderType)) {
            return false;
        }
        if (this == object) {
            return true;
        }
        final PurchaseOrderType that = ((PurchaseOrderType) object);
        {
            USAddress leftShipTo;
            leftShipTo = this.getShipTo();
            USAddress rightShipTo;
            rightShipTo = that.getShipTo();
            if (leftShipTo!= null) {
                if (rightShipTo!= null) {
                    if (!leftShipTo.equals(rightShipTo)) {
                        return false;
                    }
                } else {
                    return false;
                }
            } else {
                if (rightShipTo!= null) {
                    return false;
                }
            }
        }
        {
            USAddress leftBillTo;
            leftBillTo = this.getBillTo();
            USAddress rightBillTo;
            rightBillTo = that.getBillTo();
            if (leftBillTo!= null) {
                if (rightBillTo!= null) {
                    if (!leftBillTo.equals(rightBillTo)) {
                        return false;
                    }
                } else {
                    return false;
                }
            } else {
                if (rightBillTo!= null) {
                    return false;
                }
            }
        }
        {
            String leftComment;
            leftComment = this.getComment();
            String rightComment;
            rightComment = that.getComment();
            if (leftComment!= null) {
                if (rightComment!= null) {
                    if (!leftComment.equals(rightComment)) {
                        return false;
                    }
                } else {
                    return false;
                }
            } else {
                if (rightComment!= null) {
                    return false;
                }
            }
        }
        {
            Items leftItems;
            leftItems = this.getItems();
            Items rightItems;
            rightItems = that.getItems();
            if (leftItems!= null) {
                if (rightItems!= null) {
                    if (!leftItems.equals(rightItems)) {
                        return false;
                    }
                } else {
                    return false;
                }
            } else {
                if (rightItems!= null) {
                    return false;
                }
            }
        }
        {
            XMLGregorianCalendar leftOrderDate;
            leftOrderDate = this.getOrderDate();
            XMLGregorianCalendar rightOrderDate;
            rightOrderDate = that.getOrderDate();
            if (leftOrderDate!= null) {
                if (rightOrderDate!= null) {
                    if (!leftOrderDate.equals(rightOrderDate)) {
                        return false;
                    }
                } else {
                    return false;
                }
            } else {
                if (rightOrderDate!= null) {
                    return false;
                }
            }
        }
        return true;
    }

Why does it generate always blocks without if or try-catch?
The code complexity is unnecessary high, and the readability of it is also not the best by this!