Displaytag websphere export filter problem

[Ritesh Pareek]

Hi,

I am get the following error websphere portal 5.1 despite having the filter in web.xml.
I am trying to use the excel export option and it failing with Nested Exception below.

    
my settings in
  display.properties:
  export.excel.class=my.package.excelprocessor.ExcelWriter;(extend org.displaytag.export.excel.ExcelHssfView)
web.xml:
  using responseoveridefilter

Nseted Exception:
Unable to reset response before returning exported data. You are not using an export filter. 
Be sure that no other jsp tags are used before display:table or refer to the displaytag 
documentation on how to configure the export filter (requires j2ee 1.3).

please help me with this? All above configuration is working fine with tomcat.

Thanks

Ritesh PAreek