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Editorial Team
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Asked: 2026-05-27T00:30:09+00:00

All of a sudden my JSF 2 is rendering every page twice (with Eclipse

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All of a sudden my JSF 2 is rendering every page twice (with Eclipse and Tomcat.) No matter how simple it is. For example: 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml"
  xmlns:f="http://java.sun.com/jsf/core"
  xmlns:h="http://java.sun.com/jsf/html"
  xmlns:ui="http://java.sun.com/jsf/facelets"
  xmlns:p="http://primefaces.prime.com.tr/ui">

<h:body>
   <h:outputText value="What's going on?"></h:outputText>
</h:body>

is generating a result that looks like this:

What’s going on? What’s going on?

If I put more complex stuff in there they also show up on the page twice. I tried restarting and all but no luck. So, what’s going on?

Edit:

Thanks for your answer everyone. r0ast3d I did change my web.xml to add a filter, and when I removed the entries the double vision disappeared. But I want the filter… The entries I had are like this: 

  <filter>
    <filter-name>dontCache</filter-name>
    <filter-class>com.company.auctions.ui.DisableCacheFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>dontCache</filter-name>
    <url-pattern>*.jsf</url-pattern>
  </filter-mapping>

This is the doFilter method: 

public void doFilter(ServletRequest request, ServletResponse res, FilterChain chain) throws IOException, ServletException {
    // TODO Auto-generated method stub
    // place your code here

    System.out.println("DisableCacheFilter.doFilter CALLED");

    HttpServletResponse response = (HttpServletResponse) res;
    response.setHeader("Cache-Control", "no-cache, no-store, must-revalidate"); // HTTP 1.1.
    response.setHeader("Pragma", "no-cache"); // HTTP 1.0.
    response.setDateHeader("Expires", 0); // Proxies.
    chain.doFilter(request, response);

    // pass the request along the filter chain
    chain.doFilter(request, response);
}

What am I doing wrong?

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1 Answer

  1. Editorial Team

    The answer is right there in your doFilter method. You are calling chain.doFilter(request, response) twice.

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