AttrsBean.java

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package com.sun.faces.systest.model.ajax;

import javax.faces.context.FacesContext;
import javax.faces.context.ExternalContext;
import javax.faces.context.PartialResponseWriter;
import javax.faces.FacesException;
import javax.faces.bean.RequestScoped;
import javax.faces.bean.ManagedBean;
import java.util.Map;
import java.util.HashMap;

@ManagedBean
@RequestScoped
public class AttrsBean {

    public String eval() {

        Map<String, String> map = new HashMap<String, String>();
        map.put("value","New Value");

        FacesContext ctx = FacesContext.getCurrentInstance();
        ExternalContext extContext = ctx.getExternalContext();
        if (ctx.getPartialViewContext().isAjaxRequest()) {
            try {
                extContext.setResponseContentType("text/xml");
                extContext.addResponseHeader("Cache-Control", "no-cache");
                PartialResponseWriter writer =
                      ctx.getPartialViewContext().getPartialResponseWriter();
                writer.startDocument();
                writer.updateAttributes("form:attr",map);
                writer.endDocument();
                writer.flush();
                ctx.responseComplete();
            } catch (Exception e) {
                throw new FacesException(e);
            }
        }
        return null;

    }
}