java - HtmlUnit .setText()抛出空指针异常，但元素不为空

因此，我试图在HtmlUnit中设置元素的文本，但由于某种原因，我不太了解正在抛出NullPointerException。显然，该元素存在于页面上，并且可以通过htmlunit找到！那么为什么setText会引发错误？有任何想法吗？

码：

String code = "123";

HtmlTextInput textElem = (HtmlTextInput)page.getHtmlElementById("gc-redemption-input");
System.out.println(textElem);
textElem.setText(code);

输出：

HtmlTextInput[<input type="text" required="" id="gc-redemption-input" name="claimCode" class="gc-redemption-input a-input-text a-span12 a-form-selected" autofocus="autofocus" value="">]

错误：

Exception in thread "main"
java.lang.NullPointerException
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.hasTopCall(ScriptRuntime.java:3241)
    at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.call(InterpretedFunction.java:102)
    at com.gargoylesoftware.htmlunit.javascript.host.dom.MutationObserver.attributeReplaced(MutationObserver.java:165)
    at com.gargoylesoftware.htmlunit.html.HtmlElement.fireHtmlAttributeReplaced(HtmlElement.java:348)
    at com.gargoylesoftware.htmlunit.html.HtmlElement.fireHtmlAttributeReplaced(HtmlElement.java:353)
    at com.gargoylesoftware.htmlunit.html.HtmlElement.fireHtmlAttributeReplaced(HtmlElement.java:353)
    at com.gargoylesoftware.htmlunit.html.HtmlElement.fireHtmlAttributeReplaced(HtmlElement.java:353)
    at com.gargoylesoftware.htmlunit.html.HtmlElement.fireHtmlAttributeReplaced(HtmlElement.java:353)
    at com.gargoylesoftware.htmlunit.html.HtmlElement.fireHtmlAttributeReplaced(HtmlElement.java:353)
    at com.gargoylesoftware.htmlunit.html.HtmlElement.fireHtmlAttributeReplaced(HtmlElement.java:353)
    at com.gargoylesoftware.htmlunit.html.HtmlElement.fireHtmlAttributeReplaced(HtmlElement.java:353)
    at com.gargoylesoftware.htmlunit.html.HtmlElement.fireHtmlAttributeReplaced(HtmlElement.java:353)
    at com.gargoylesoftware.htmlunit.html.HtmlElement.setAttributeNS(HtmlElement.java:209)
    at com.gargoylesoftware.htmlunit.html.HtmlInput.setAttributeNS(HtmlInput.java:538)
    at com.gargoylesoftware.htmlunit.html.HtmlTextInput.setAttributeNS(HtmlTextInput.java:164)
    at com.gargoylesoftware.htmlunit.html.DomElement.setAttribute(DomElement.java:331)
    at com.gargoylesoftware.htmlunit.html.HtmlInput.setValueAttribute(HtmlInput.java:94)
    at com.gargoylesoftware.htmlunit.html.HtmlTextInput.setText(HtmlTextInput.java:124)

最佳答案

问题可能是String code = '123';，因为它在我的IDE中显示以下错误：Unclosed character literal。尝试使用双引号：String code = "123";。

关于java - HtmlUnit .setText()抛出空指针异常，但元素不为空，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/38231693/