Question

我在日志中看到了一些NullPointerExceptions。所有例外都来自两个用户。弹簧控制器应该接收用户上传的表单对象。但它是空的。

这是表单的jsp代码：

<form method="POST" action="/events/${id}/tickets/checkout" id="checkout-info-form">

                                    <label> Recipient Name <input id="recipient" type="text" name="recipient"></label>

                                    <label class="address-row checkout-hidable"> Address Line 1 <input id="address1" type="text" name="addressLine1"> </label>
                                    <label class="checkout-hidable"> Address Line 2 (optional) <input id="address2" type="text" name="addressLine2"> </label>
                                    <label class="city-row checkout-hidable"> City <input type="text" id="city" name="city" placeholder="e.g. New York"> </label>
                                    <label class="state-row checkout-hidable"> State <input type="text" id="state" name="state" placeholder="e.g. NY"> </label>
                                    <label class="zip-row checkout-hidable">  Zip Code <input type="text" id="zip" name="zip" placeholder="e.g. 12345"> </label>
                                    <label class="shipping-row">Shipping Method:</label>
                                    <label class="shipping-method">
                                       <input type="radio" name="shipping" value="usps_5days" id="shipping1">
                                       <span>USPS 3-5 days shipping</span> $5.99
                                    </label>
                                    <label class="shipping-method">
                                       <input type="radio" name="shipping" value="usps_1days" id="shipping2">
                                       <span>USPS overnight shipping</span> $19.99
                                    </label>
                                    <c:set var="index" value="${0}"/>
                                    <c:forEach items="${tickets}" var="ticket">
                                       <input type="hidden" name="tickets[${index}]" value="${ticket.id}">
                                       <c:set var="index" value="${index + 1}"/>
                                    </c:forEach>
                                    <c:remove var="index"/>
                                    <input id="checkout-info-form-submit-button" class="btn-blue-large" type="submit" name="submitbutton" value="Next step">
                                </form>

这是我用来接收表单的模型对象：

public class CheckoutInfo implements Serializable {
    private static final long serialVersionUID = 2585075011792338943L;
    private String recipient;
    private String addressLine1;
    private String addressLine2;
    private String city;
    private String state;
    private String zip;
    private String shipping;
    private String[] tickets;

    public CheckoutInfo() {

    }
}

控制器：

@RequestMapping(value="/events/{eventId}/tickets/checkout", method=RequestMethod.POST)
    public ModelAndView purchaseTickets(
            @PathVariable("eventId") long id,
            CheckoutInfo checkoutInfo,
            RedirectAttributes redir,
            @AuthenticationPrincipal User user) {
        ......
    }

出现空指针异常，因为checkoutInfo为null。我不知道为什么会发生这种情况。我从未见过这种情况。而这仅来自我们的一些用户。我使用的是spring boot v1.2.3.RELEASE

如果有人能提供帮助，我感激不尽。

jsp表单上偶尔出现空指针异常（java Spring Boot）

0 个答案: