ADF--Re-opening Download does not deliver correct content.

Question

I am using JDeveloper 11.1.1.4 and having an issue with downloading files. The first time a user clicks on the command link, the file opens fine. If the user closes the application that the file opened in, and clicks the same link to re-open the file (in this case a PDF) they get an error from Adobe saying the downloaded file is not a supported file type or because the file has been damaged. It seems that it doesn't read all the file. I am using code similar to other posts I've found on this discussion forum. I am adding my java code below, and the Weblogic Server Log messages, and would appreciate any good advice to resolve this issue.
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import javax.servlet.http.HttpServletResponse;
import oracle.adf.model.BindingContext;
import oracle.adf.model.binding.DCBindingContainer;
import oracle.adf.model.binding.DCIteratorBinding;
import oracle.jbo.Row;
import oracle.jbo.ViewObject;
import oracle.jbo.domain.BlobDomain;
public class Download {
    public Download() {
        super();
    public void downloadFile(FacesContext facesContext,
                             OutputStream outputStream) throws IOException {
        String mime = null;
        ExternalContext extContext = facesContext.getExternalContext();
        DCBindingContainer dc =
            (DCBindingContainer)BindingContext.getCurrent().getCurrentBindingsEntry();
        System.out.println("Before getting iterator");
        DCIteratorBinding iter =
            dc.findIteratorBinding("hot_biz_docs_view1Iterator");
        ViewObject vo = iter.getViewObject();
        Row r = vo.getCurrentRow();
        BlobDomain bDomain = (BlobDomain)r.getAttribute("Document");
        String file = r.getAttribute("FileName").toString();
        String ext = file.toLowerCase();
        System.out.println("In MimeTypes:" + ext);
        if (ext.endsWith(".pdf")) {
            mime = "application/PDF";
        } else if (ext.endsWith(".doc")) {
            mime = "application/msword";
        } else if (ext.endsWith(".docx")) {
            mime =
"application/vnd.openxmlformats-officedocument.wordprocessingml.document";
        } else if (ext.endsWith(".xls")) {
            mime = "application/vnd.ms-excel";
        } else if (ext.endsWith(".xls")) {
            mime =
"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
        } else if (ext.endsWith(".txt")) {
            mime = "text/plain";
        } else if (ext.endsWith(".ppt")) {
            mime = "application/vnd.ms-powerpoint";
        } else if (ext.endsWith(".rar")) {
            mime = "application/octet-stream";
        } else if (ext.endsWith(".zip")) {
            mime = "application/zip";
        } else if (ext.endsWith(".jpg")) {
            mime = "image/jpeg";
        Long length = bDomain.getLength();
        HttpServletResponse response =
            (HttpServletResponse)extContext.getResponse();
        response.setHeader("Content-Disposition",
                           "attachment;filename=\"" + file + "\"");
        response.setContentLength((int)length.intValue());
        System.out.println(mime);
        response.setContentType(mime);
        InputStream in = null;
        try {
            in = bDomain.getBinaryStream();
            outputStream = response.getOutputStream();
            byte[] buf = new byte[1024];
            int count;
            while ((count = in.read(buf)) >= 0) {
                outputStream.write(buf, 0, count);
                if (count <= 0) {
                    System.out.println("End if while loop");
                    break;
        } catch (IOException ex) {
            System.out.println(ex.getMessage());
            ex.printStackTrace();
        in.close();
        outputStream.flush();
        outputStream.close();
        response.flushBuffer();
        facesContext.responseComplete();
        System.out.println("closed and responseComplete");
    }<Aug 22, 2011 4:11:11 PM CDT> <Error> <HTTP> <BEA-101083> <Connection failure.
java.net.ProtocolException: Didn't meet stated Content-Length, wrote: '0' bytes instead of stated: '3544' bytes.
     at weblogic.servlet.internal.ServletOutputStreamImpl.ensureContentLength(ServletOutputStreamImpl.java:446)
     at weblogic.servlet.internal.ServletResponseImpl.ensureContentLength(ServletResponseImpl.java:1432)
     at weblogic.servlet.internal.ServletResponseImpl.send(ServletResponseImpl.java:1511)
     at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1462)
     at weblogic.work.ExecuteThread.execute(ExecuteThread.java:207)
     Truncated. see log file for complete stacktrace
>
<Aug 22, 2011 4:11:11 PM CDT> <Error> <HTTP> <BEA-101104> <Servlet execution in servlet context "ServletContext@33250642[app:LIB_Test module:LIB_Test-LibTestVC-context-root path:/LIB_Test-LibTestVC-context-root spec-version:2.5]" failed, java.net.ProtocolException: Didn't meet stated Content-Length, wrote: '0' bytes instead of stated: '3544' bytes..
java.net.ProtocolException: Didn't meet stated Content-Length, wrote: '0' bytes instead of stated: '3544' bytes.
     at weblogic.servlet.internal.ServletOutputStreamImpl.ensureContentLength(ServletOutputStreamImpl.java:446)
     at weblogic.servlet.internal.ServletResponseImpl.ensureContentLength(ServletResponseImpl.java:1432)
     at weblogic.servlet.internal.ServletResponseImpl.send(ServletResponseImpl.java:1511)
     at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1462)
     at weblogic.work.ExecuteThread.execute(ExecuteThread.java:207)
     Truncated. see log file for complete stacktrace
>

Answer 1

You need to close the blob stream, otherwise you can't read it again.
Use the blob.closeInputStream() method on your blob.
Timo