Question

您好我在上传文件时遇到错误，即使我的bean中的方法为空，我也会收到错误。

这是我的JSF

<html xmlns="http://www.w3.org/1999/xhtml"
  xmlns:h="http://xmlns.jcp.org/jsf/html"
  xmlns:f="http://xmlns.jcp.org/jsf/core">
<h:head>
    <h:outputStylesheet library="css" name="main-admin.css"/>
</h:head>
<h:body>
    <div class="container-fluid">
        <div class="row">
            <div class="col-sm-12">
                <h:form id="form" enctype="multipart/form-data">
                    <h:inputFile id="file" value="#{userPictureUploadView.file}"/>
                    <h:commandButton value="Upload"
                                     action="#{userPictureUploadView.uploadProfilePicture}">
                    </h:commandButton>
                </h:form>
            </div>
        </div>
    </div>

</h:body>
</html>

这是我得到的错误

Caused by: java.lang.NullPointerException: Argument Error: Parameter text is null
    at com.sun.faces.renderkit.html_basic.HtmlResponseWriter.writeText(HtmlResponseWriter.java:949)
    at javax.faces.context.ResponseWriterWrapper.writeText(ResponseWriterWrapper.java:298)
    at com.liferay.faces.bridge.renderkit.primefaces.internal.PrimeFacesInlineScript.encodeBegin(PrimeFacesInlineScript.java:51)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1854)
    at com.liferay.faces.bridge.renderkit.html_basic.internal.BodyRendererBridgeImpl.encodeBegin(BodyRendererBridgeImpl.java:117)
    at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:865)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1854)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:458)
    at javax.faces.view.ViewDeclarationLanguageWrapper.renderView(ViewDeclarationLanguageWrapper.java:146)
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:134)
    at com.liferay.faces.bridge.application.internal.ViewHandlerCompatImpl.renderView(ViewHandlerCompatImpl.java:95)
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    ... 223 more

我不知道为什么我会收到异常，似乎在执行该方法后会触发错误，就像重新加载一样。

所有这一切都在我在Liferay制作的portlet中。

更多信息：

我使用Liferay.faces.bridge的这些版本＆＃39; com.liferay.faces：com.liferay.faces.bridge.impl：4.0.0＆＃39; ＆＃39; com.liferay.faces：com.liferay.faces.bridge.ext：5.0.0＆＃39;

Answer 1

解决方案是使用ajax或uploadListener

                        <div class="form-group">
                            <div class="control-label">#{res['userProfilePictureUpload.profilePicture']}</div>
                            <p:fileUpload fileUploadListener="#{userPictureUploadView.handleFileUpload}" mode="advanced" allowTypes="/(\.|\/)(png)$/" auto="true" previewWidth="0" label="#{res['userProfilePictureUpload.upload']}" oncomplete="location.reload();"/>
                        </div>

h：inputFile和h：commandButton - NullPointerException

1 个答案: