是什么导致javax.faces.application.ViewExpiredException？

Question

打开视图的4个标签后，我不断收到 javax.faces.application.ViewExpiredException 。每个选项卡都使用@ViewScoped并拥有自己的Managed bean。我已经尝试过在网上看到的修复程序，比如为每个Managed bean实现Serializable，增加会话超时和

将其放在web.xml中

<context-param>
    <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
    <param-value>server</param-value>
</context-param>

<context-param>
    <param-name>com.sun.faces.numberOfViewsInSession</param-name>
    <param-value>15</param-value>
</context-param>

<context-param>
    <param-name>com.sun.faces.serializeServerState</param-name>
    <param-value>false</param-value>
</context-param>


<context-param>
    <param-name>org.apache.myfaces.NUMBER_OF_VIEWS_IN_SESSION</param-name>
    <param-value>15</param-value>
</context-param>

<context-param>
    <param-name>org.apache.myfaces.SERIALIZE_STATE_IN_SESSION/param-name>
    <param-value>false</param-value>
</context-param>

我使用的每个页面都与此相同，并使用不同的支持bean：

<h:form>
        <p:poll interval="1" listener="#{someBean.refresh}" update="table"
            global="false" />
            <p:dataTable id="table" value="#{someBean.list}" var="e"
                rowIndexVar="rowIndex">
                <p:column headerText="" style="width: 10%">
                    <h:outputText value="#{rowIndex}" />
                </p:column>
                <p:column headerText="Description" style="width: 90%">
                    <h:outputText value="#{e.description}" />
                </p:column>
            </p:dataTable>
        </h:form>