HtmlUnit .setText（）拋出一個空指針異常，但元素不爲空

所以我試圖在HtmlUnit中設置一個元素的文本，但由於某種原因，我不太明白NullPointerException被拋出。顯然這個元素存在於頁面上，並且通過htmlunit找到它！那麼爲什麼setText會拋出一個錯誤？有任何想法嗎？HtmlUnit .setText（）拋出一個空指針異常，但元素不爲空

代碼：

String code = "123"; 

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

輸出：

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="">]

錯誤：

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)

來源

2016-07-06 k9b

現在應該修復。請參閱[Htmlunit填充輸入空指針，但元素沒有空]（http://stackoverflow.com/questions/41839518/htmlunit-null-pointer-on-filling-input-but-element-is-not-nulled） – RBRi

的問題可能是String code = '123';，因爲這說明我的IDE中出現以下錯誤：Unclosed character literal。嘗試使用雙引號：String code = "123";。

來源

2016-07-06 19:10:15 pzaenger

謝謝你的好成績！不幸的是，這不是問題，這是我沒有複製過的一行，而是輸入:) – k9b

HtmlUnit .setText（）拋出一個空指針異常，但元素不爲空

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