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I am trying to get the HttpServletResponse from liferay portal. I am also working with icefaces.
PortletResponse response1 = (PortletResponse)FacesContext.getCurrentInstance().getExternalContext().getResponse();
HttpServletResponse response = (HttpServletResponse)response1;
I get the following Exception:
Caused by: java.lang.ClassCastException: com.liferay.portlet.RenderResponseImpl cannot be cast to javax.servlet.http.HttpServletResponse
Try
PortalUtil.getHttpServletResponse(portletResponse)