Error in filedownload from KM

Hi All,
I'm developing an Web dynpro application for upload files to KM repository of portal . i have added KM navigation facility in it in table format.
so that user can see thr uploaded files.
now i want to download and open those files from same table which is showing me file via KM Navigation.I'm using normal file downloading funda for this.
when i click on particular file it gives me 2 option open and save.
*whn i click on SAVE *
*it shows an arror message *
"Internet explorer cannot download 02aXXXXXXsap-wd-norefresh=X from <portal hostname>
Internet exploere cannot open this internet site.requested site is unavailble or cannot be found.pls try again later."
i click on OPEN it shows*
java.lang.NullPointerException
at com.sap.tc.webdynpro.progmodel.mime.OnDemandInputStream.read(OnDemandInputStream.java:66)
at java.io.InputStream.read(InputStream.java:89)
at com.sap.tc.webdynpro.basesrvc.util.IOUtil.write(IOUtil.java:103)
at com.sap.tc.webdynpro.services.sal.util.cache.ResourcePool$AbstractResourceElement.copy(ResourcePool.java:264)
at com.sap.tc.webdynpro.services.sal.util.cache.ResourcePool$CopyByFirstReadResourcePoolElement.save(ResourcePool.java:542)
at com.sap.tc.webdynpro.services.sal.util.cache.ResourcePool$CopyByFirstReadResourcePoolElement.getLength(ResourcePool.java:604)
at com.sap.tc.webdynpro.services.sal.util.cache.AbstractCachedSource.getContentLength(AbstractCachedSource.java:230)
at com.sap.tc.webdynpro.clientserver.cal.WebDynproExchangeHandler.responseCachedWebResource(WebDynproExchangeHandler.java:83)
at com.sap.tc.webdynpro.clientserver.cal.WebDynproExchangeHandler.doExchange(WebDynproExchangeHandler.java:179)
at com.sap.tc.webdynpro.clientserver.session.ClientSession.doExchangeProcessing(ClientSession.java:1126)
at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessingStandalone(ClientSession.java:717)
at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessing(ClientSession.java:666)
at com.sap.tc.webdynpro.clientserver.session.ClientSession.doProcessing(ClientSession.java:250)
at com.sap.tc.webdynpro.clientserver.session.RequestManager.doProcessing(RequestManager.java:149)
at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doContent(DispatcherServlet.java:62)
at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doGet(DispatcherServlet.java:46)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:401)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:266)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:387)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:365)
at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:944)
at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:266)
at com.sap.engine.services.httpserver.server.Client.handle(Client.java:95)
at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:175)
at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)
at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)
at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
at java.security.AccessController.doPrivileged(Native Method)
at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:100)
at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:170)
when i go n check on line #66 its automaticlly genreted code
static
    //@@begin id
          String id = "$Id$";
    //@@end
    com.sap.tc.logging.Location.getLocation("ID.com.sap.tc.webdynpro").infoT(id);
helpful posts'll b appriciated
Regards,
Khushboo

Hi Khushboo,
If you paste the code you are using to read a file from KM, it will be more helpful in isolating the error.
Also you can go through following blogs which talk about downloading files from KM using WDJ.
[How to download KM documents using Web Dynpro Java|How to download KM documents using Web Dynpro Java]
[Getting an image from KM Documents to be used in Web Dynpro|Getting an image from KM Documents to be used in Web Dynpro]
Regards,
Deepti

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