You are the best! That solves the problem...the reports.zip is generated..but it only contains report folder..don't see any reports. Could please review my code blow and point out what the cause could be. Thanks a lot!

Also, thank you for posting the .Net sample that I am following..that is the best and the only one I can find for retrieving reports metadata.Great work!

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@SuppressWarnings("static-access")
    public void retrieveReports(String[] reportFiles) {        // from debugger I can see that reportFiles is correct..
        // build up an unpackaged retrieve request for the list of reports.
        RetrieveRequest r = new RetrieveRequest();
        r.setApiVersion(API_VERSION);
        r.setUnpackaged(new _package());
        PackageTypeMembers m = new PackageTypeMembers();
        m.setName("Report");
        m.setMembers(reportFiles);
        r.getUnpackaged().setTypes(new PackageTypeMembers[] { m });
        r.getUnpackaged().setVersion("V1.0");
        
        // start the retrieve request
        AsyncResult ar;
        try {
            ar = this.metadatabinding.retrieve(r);
            // wait for it to complete, sleeping as necassary.
            while (!ar.isDone()) {

                Thread.currentThread().sleep(3000);
                ar = this.metadatabinding
                        .checkStatus(new String[] { ar.getId() })[0];

            }

            // did it work ?
            if (ar.getState().toString() == AsyncRequestState._Error) {
                System.out.print(ar.getStatusCode() + ar.getMessage());
            } else {
                 // now actually go get the results
                RetrieveResult rr = metadatabinding.checkRetrieveStatus( ar.getId());
                if (rr.getMessages() != null){
                     for (RetrieveMessage rm :rr.getMessages()){
                        
                         System.out.println(rm.getFileName() + rm.getProblem());
                     }
                }
                
                // Write the zip file to disk
                String file_name = "c:\\reports.zip";
                FileWriter file = new FileWriter(file_name);
           
                BufferedWriter out = new BufferedWriter (file);
                out.write(new String( rr.getZipFile()));
                out.close();
            }
            
        } catch (RemoteException e) {
            e.printStackTrace();
        } catch (InterruptedException e1) {
            e1.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

@SuppressWarnings("unchecked")
    public String[] getReportList() {
        ListMetadataQuery q = new ListMetadataQuery();
        q.setType("ReportFolder");

        try {
            FileProperties[] fp = metadatabinding.listMetadata(
                    new ListMetadataQuery[] { q }, 0);

            if (fp == null) {
                System.out.println("No report folders returned");
                return null;
            }

            List<String> reportFiles = new ArrayList();

            q.setType("Report");
            for (FileProperties p : fp) {
                q.setFolder(p.getFullName());
                // listMetadata can take more than one item at a time
                // left as an exercise for the reader to batch up these calls.
                FileProperties[] rps = metadatabinding.listMetadata(
                        new ListMetadataQuery[] { q }, 14.0);
                if (rps == null) {
                    continue;
                }
                for (FileProperties rp : rps) {
                    System.out.println("MY DEBUG OUTPUT....rp.getFileName()=" + rp.getFileName());
                    reportFiles.add(rp.getFullName());
                }

            }
            return (String[]) reportFiles.toArray(new String[0]);

        } catch (RemoteException e) {
            e.printStackTrace();
        }

        return null;

    }