I've inserted a <p:fileUpload /> component into my JSF 2.1.5 application. I'm using PrimeFaces 3.4.1. This component is backed by a @ViewScoped bean. I have my form in this way:
<?xml version='1.0' encoding='UTF-8' ?>
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:c="http://java.sun.com/jsp/jstl/core"
xmlns:p="http://primefaces.org/ui"
template="/templates/general_template.xhtml">
<ui:define name="metadata">
<f:metadata>
<f:viewParam id="NavIndex" name="NavIndex"
value="#{navegableMassiveUserAdd._QueueIndex}" />
<f:event type="preRenderView"
listener="#{navegableMassiveUserAdd.initialize}" />
</f:metadata>
</ui:define>
<ui:define name="general_content">
<h:form>
<p:fileUpload
fileUploadListener="#{navegableMassiveUserAdd.listener}"
mode="advanced" allowTypes="/(\.|\/)(xls|csv)$/"
label="#{msg.SELECT}" multiple="false" />
<p:commandButton id="cancelButton"
action="#{navegableMassiveUserAdd.actionCancelAdd}"
value="#{msg.CANCELAR}" ajax="false" style="margin: 9px 0px 5px;" />
</h:form>
</ui:define>
Here it is my main template:
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:c="http://java.sun.com/jsp/jstl/core"
xmlns:p="http://primefaces.org/ui" xmlns:o="http://omnifaces.org/ui">
<h:head>
<meta http-equiv="Pragma" CONTENT="no-cache"></meta>
<meta http-equiv="cache-control" content="no-cache"></meta>
<meta http-equiv="Expires" CONTENT="-1"></meta>
<meta http-equiv="Content-Type"
content="text/html; charset=ISO-8859-15" />
<h:outputStylesheet library="css" name="prime_styles.css" />
<h:outputScript library="js" name="prime_translations.js" />
</h:head>
<h:body>
<ui:insert name="metadata" />
<ui:insert name="general_logged_user">
<div align="right">
<span style="color: #B22222; padding: 3px;"> <h:outputText
value="#{loggedBean._Login}" />
</span> <span style="color: #FFA54F; padding: 3px;"> <h:outputText
value="Auth Method: #{loggedBean._Usuario._CUser._AuthenticationMethod}" />
</span>
</div>
</ui:insert>
<f:view locale="#{localeBean.locale}">
<ui:insert name="general_settings">
<f:loadBundle basename="resources.system.bundles.Messages" var="msg" />
<p:ajaxStatus style="width:0px;height:0px;" id="ajaxStatusPanel"
styleClass="spinner_ajax_loading">
<f:facet name="start">
<h:graphicImage value="/resources/images/loading.gif" />
</f:facet>
<f:facet name="complete">
<h:outputText value="" />
</f:facet>
</p:ajaxStatus>
<p:growl id="messages" autoUpdate="true" />
</ui:insert>
<f:event type="preRenderView"
listener="#{navigationManagerSystem.initialize}" />
<h:panelGroup>
<ui:insert name="general_header">
<ui:include src="/components/header.xhtml" />
</ui:insert>
<h:panelGroup id="menuNavegacionPanel">
<h:form>
<h:panelGroup id="navigationPanel"
rendered="#{navigationManagerSystem._ShowNavegacion}">
<h:panelGroup
rendered="#{!navigationManager._DisableNavigationButtons}">
<p:toolbar>
<p:toolbarGroup>
<ui:repeat value="#{navigationManagerSystem._Navegables}"
var="item">
<p:button value="#{item._Title}"
outcome="#{item._NavigationResult}">
<f:param name="NavIndex" value="#{item._QueueIndex}" />
</p:button>
</ui:repeat>
<p:button disabled="true"
value="#{navigationManagerSystem._Navegable._Title}" />
</p:toolbarGroup>
</p:toolbar>
</h:panelGroup>
</h:panelGroup>
</h:form>
</h:panelGroup>
<ui:insert name="general_content">
<ui:include src="/system/content.xhtml" />
</ui:insert>
</h:panelGroup>
<ui:insert name="general_footer">
<ui:include src="/components/general_footer.xhtml" />
</ui:insert>
</f:view>
</h:body>
With that, when I upload my file, the bean is being rebuilt and the listener method not being called. I have the filters put in my web.xml. Also if I change my form and set it as enctype="multipart/form-data", as I read in documentation, I can't avoid the problem and the bean is rebuilt again, in this case even when I click on the cancel button. That's my bean code, where SystemNavegable is an abstract class:
@SuppressWarnings("serial")
@ManagedBean
@ViewScoped
public class NavegableMassiveUserAdd extends SystemNavegable {
/**
* Field logger.
*/
protected final Log logger = LogFactory.getLog(this.getClass());
/**
* Constructor for NavegableMassiveUserAdd.
*/
public NavegableMassiveUserAdd() {
super();
this.set_Title(FacesUtils.getBundle(BundleNames.BUNDLE_SYSTEM_MENU,
BundleKeys.SYSTEM_NAVEGABLE_ADD_USERS, "Añadir usuarios"));
this.set_TitleDescription(FacesUtils.getBundle(BundleNames.BUNDLE_SYSTEM_MENU,
BundleKeys.SYSTEM_NAVEGABLE_ADD_USERS_DESCRIPTION, "Añadir usuarios"));
this.set_NavigationResult(NavigationResults.MASSIVE_USER_ADD);
this._Behaviour = NavegableBehaviour.ADD;
}
/**
* Method actionCancelAdd.
*
* @return
*/
public String actionCancelAdd() {
return this._NavigationManagerSystem.cancelNavegable();
}
/**
* Escuchador del evento Upload.
*
*
*
* @param event
* FileUploadEvent
* @throws IOException
* @throws java.io.IOException
*/
public void listener(FileUploadEvent event) throws IOException {
UploadedFile uploadItem = event.getFile();
//More code
}
Any suggestion? Thanks in advance.
EDITED
More tests done and I found that the file upload listener method is never reached, it doesn't matter which Scope I give to the backing bean. I have following dependencies included:
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.2.1</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>1.3.2</version>
</dependency>
And I suspect the problem can be there's another filter conflicting with the one I have for the upload component, as is told here. Whatever the problem is, my bean's initialize method is being called again when file is uploaded and FacesContext.getCurrentInstance().isPostback() comes with false.
After several brainstorming, I found it's a filter problem. Because of upload filters are in conflict with PrettyFaces filters, I had to add this to my web.xml:
<filter-mapping>
<filter-name>PrimeFaces FileUpload Filter</filter-name>
<servlet-name>Faces Servlet</servlet-name>
<dispatcher>FORWARD</dispatcher>
</filter-mapping>
Many thanks @Reinaldo de Carvalho for this response
In my case problem was in Tomcat server POST size limit. So, after parameter maxPostSize of Connector section in server.xml has been set file upload start to work great with @ViewScoped bean.
Also notice that tomcat official documentation is incorrect and for unlimited size of POST maxPostSize value must be set less then 0, because when it`s equals 0 means zero size.
http://tomcat.apache.org/tomcat-7.0-doc/config/ajp.html HttpRequest maximum allowable size in tomcat?
来源：https://stackoverflow.com/questions/14260225/viewscoped-bean-rebuilt-when-fileuploadlistener-called-using-prettyfaces