Hi..., When I use libraries(ajax4jsf,ajax4jsf-cdk) export excel and when I open a word document which I downloaded, It works whereas with libraries (ajax4jsf-1.1.1,richfaces-3.0.1) It doesn't work. Why? please help me. That gives an error : anonymous wrote : javax.servlet.ServletException: Servlet response already use stream, Writer not possible | javax.faces.webapp.FacesServlet.service(FacesServlet.java:154) org.ajax4jsf.framework.ajax.xmlfilter.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:127) org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter.java:277) org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:100) org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:147) | ... | .... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4057384#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...