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Getting Httpservletresponse and servletoutputstream in Portlet JSF

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Hi All,

The below code is working fine in a DynamicProject created in RAD.But in portlet project its not working.I'm getting null pointer exception for httpresponse,so I made it static.BUt still even though i get httpservletresponse instance I'm getting null pointer exception in getting servletoutputstream.
I had used externalcontext but still I get null pointer exception while trying to get ServletoutputStream instance.

My requirement is when I click on the command button or commandLink I'm calling a method which converts byte array to filetype specified.But I get null pointer exception when I try to get servletoutputstream.If someone has faced the same pbm and got the solution please let me know.
I'm posting my code here.

public void doClickAction(ActionEvent event)
try {
File f=new File("c:\\test.html");
HttpServletResponse httpServletResponse= FacesContext.getCurrentInstance().getExternalContext().getResponse();
ServletOutputStream servletOutputStream = httpServletResponse.getOutputStream();
httpServletResponse.setHeader("Content-disposition", "attachment; filename=" +"test.html");
httpServletResponse.setContentLength((int) f.length());
} catch (IOException e) {

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Either way what you are trying can not be achieved from portlets.
Youa re trying to open a binary dowloadable file through portlet.
Portlets do not recognize any MIME type except text/html.
So also the httpservletresponse needs to be casted to a websphere specfic servlet response .
Anyway the correct way of handling such calls and I need to send a PDf output is that you invoke a link from your portlet page which in turn invokes a servlet in your web app and do the necessary content header setting in the servlet and write directly the stream output form servlet without going to the portlet.
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