JSF Ajax返回空304响应 - 导致页面崩溃

Question

我在浏览器中显示此错误消息并且页面停止响应：

core.js.xhtml?ln=primefaces&v=6.0:3 Uncaught TypeError: Cannot read property 'getElementsByTagName' of undefined

似乎这个Tomcat或JSF正在缓存POST请求！

我尝试move css on the bottom on the page - 它没有帮助。

Answer 1

我所做的是设置特殊的阶段监听器来强制浏览器使缓存无效：

<强>面-config.xml中

<lifecycle>
    <phase-listener id="nocache">com.xxxx.jsf.util.CacheControlPhaseListener</phase-listener>
    <phase-listener>org.primefaces.component.lifecycle.LifecyclePhaseListener</phase-listener>
    <phase-listener>com.xxxx.jsf.listeners.BackButtonPhaseListener</phase-listener>
</lifecycle>

<强>类：

import javax.faces.context.FacesContext;
import javax.faces.event.PhaseEvent;
import javax.faces.event.PhaseId;
import javax.faces.event.PhaseListener;
import javax.servlet.http.HttpServletResponse;

public class CacheControlPhaseListener implements PhaseListener {
    public PhaseId getPhaseId() {
        return PhaseId.RENDER_RESPONSE;
    }

    public void afterPhase(PhaseEvent event) {
    }

        public void beforePhase(PhaseEvent event) {
            FacesContext facesContext = event.getFacesContext();
            HttpServletResponse response = (HttpServletResponse) facesContext.getExternalContext().getResponse();
            response.addHeader("Pragma", "no-cache");
            response.addHeader("Cache-Control", "no-cache");
            // Stronger according to blog comment below that references HTTP spec
            response.addHeader("Cache-Control", "no-store");
            response.addHeader("Cache-Control", "must-revalidate");
            // some date in the past
            response.addHeader("Expires", "Mon, 8 Aug 2006 10:00:00 GMT");
        }
    }