Error with response object in Portal Application Module

Question

Hi,
i have a portal application project in NWDS, with a JspDynpage component. I have a jsp that contains this code:
OutputStream os = componentResponse.getServletResponse().getOutputStream();
response.addHeader("Content-Disposition", "attachment;filename=" + sTITLE +".pdf");
response.setContentType("application/pdf");
os.write(contenido);
os.close();
this code open a pdf in new window. In web module project that app runs correctly but in portal application no, it fails in object response. the log (in default trace) doesn´t help me nothing, only sais:
Jun 6, 2011 3:19:55 PM     com.sap.portal.prt.runtime.servlet_jsp [SAPEngine_Application_Thread[impl:3]_13] Error: >>> JSPCompiler >>> ERROR in Compiling :JSPFileInfo :314221189
JSP File : /usr/sap/DP4/DVEBMGS40/j2ee/cluster/server0/apps/sap.com/irj/servlet_jsp/irj/root/web-inf/portal/portalapps/appl.factdist.efact.por/pagelet/inicio.jsp
Class Name: sapportalsjspInicio
Java File : /usr/sap/DP4/DVEBMGS40/j2ee/cluster/server0/apps/sap.com/irj/servlet_jsp/irj/root/web-inf/portal/portalapps/appl.factdist.efact.por/work/pagelet/_sapportalsjsp_inicio.java
Package Name : pagelet
Class File : /usr/sap/DP4/DVEBMGS40/j2ee/cluster/server0/apps/sap.com/irj/servlet_jsp/irj/root/web-inf/portal/portalapps/appl.factdist.efact.por/work/pagelet/_sapportalsjsp_inicio.class
Is out dated : false [email protected]bbc2b
In addition, i can use the request object perfectly
somebody knows what's happening??
Thank you,
Fernando

Answer 1

Hi,
You shouldn't use the response object directly
Instead, create a new HttpServletResponse reference from the componentRequest object.
Try using the following:
long length = file.length(); // where 'file' is a File() object of your sTITLE +".pdf" file
// Create the byte array to hold the data
byte[] bytes = new byte[(int)length];
int offset = 0;
int numRead = 0;
while (offset < bytes.length && (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0) {
    offset += numRead;
//The most important part:
HttpServletResponse res = componentRequest.getServletResponse(true);
res.setContentType("application/pdf");
res.addHeader("Content-Disposition", "attachment;filename=" + sTITLE +".pdf");
res.getOutputStream().write(bytes);