com.vmware.apputils.vim25.ServiceConnection S1 = vConnection.getConnection();
VimPortType service = S1.getService();
ServiceContent content = S1.getServiceContent();
ManagedObjectReference datacenter = getDatacenter(vConnection.getServiceUtil(), dcName);
ManagedObjectReference esxMor = getHost(biosUuid, vConnection);
ManagedObjectReference resourcePool = getResourcePool(vConnection.getServiceUtil(), esxMor, datacenter);
ManagedObjectReference folder = vConnection.getServiceUtil().getMoRefProp(datacenter, "vmFolder");
ManagedObjectReference datastore = getDatastore(vConnection.getServiceUtil(), esxMor, datastoreName);
com.vmware.vim25.OvfNetworkMapping[] networkMappings = new com.vmware.vim25.OvfNetworkMapping[2];
ManagedObjectReference] networks = (ManagedObjectReference[)vConnection.getServiceUtil().getDynamicProperty(esxMor, "network");
/* snip snip - setup networkMappings */

com.vmware.vim25.OvfCreateImportSpecParams cisp = new com.vmware.vim25.OvfCreateImportSpecParams( null,
null,
"",
"",
null,
applianceName,
esxMor,
networkMappings,
null,
null,
null);
com.vmware.vim25.OvfCreateImportSpecResult cisr = service.createImportSpec(content.getOvfManager(), ovfDescriptor, resourcePool, datastore, cisp);
com.vmware.vim25.OvfFileItem[] fileItems = cisr.getFileItem(); // ******** all the files have create=false
com.vmware.vim25.LocalizedMethodFault[] faults = cisr.getWarning(); // ******** this is empty
return new HttpNfcLease(service.importVApp(resourcePool, cisr.getImportSpec(), folder, esxMor));
} catch (Exception e) {
throw new /* snip snip */
}
}

And then here is the PUT code:

httpLease = VsphereToolkit.getHttpNfcLease(ovf, uuid, applianceName, datastoreName, dcName, c);

do {
doSleep(1000);
} while (httpLease.getLeaseState(c).equals(VsphereToolkit.HttpNfcLease.LEASE_STATE_INITIALIZING));

String state = httpLease.getLeaseState(c);
if(state.equals(VsphereToolkit.HttpNfcLease.LEASE_STATE_READY)) {
List<String> uploadUrls = httpLease.getUploadUrls(c);
int totalBytes = 0;
int bytesDownloaded = 0;
for(File file : vmdkFiles) {
totalBytes += file.length();
}
for(int x=0;x<uploadUrls.size();x++) {
String url = uploadUrls.get(x);
File file = vmdkFiles[x];
System.out.println("Url " + x + ": " + url);
HttpsURLConnection urlConnection = (HttpsURLConnection)new URL(url).openConnection();
HostnameVerifier hv = new HostnameVerifier() {
public boolean verify(String urlHostName, SSLSession session) {
return true;
}
};
urlConnection.setHostnameVerifier(hv);
urlConnection.setSSLSocketFactory(/* our default socket factory */);
urlConnection.setDoOutput(true);
urlConnection.setRequestMethod("PUT");
urlConnection.setRequestProperty("Content-Length", String.valueOf(file.length()));
urlConnection.setFixedLengthStreamingMode((int)file.length());
urlConnection.connect();

/* if we check the status code here or afterwards, it is 403 */
// int resultCode = urlConnection.getResponseCode();

OutputStream os = urlConnection.getOutputStream();
FileInputStream fis = new FileInputStream(file);
byte b[] = new byte1024 * 4;
int count = 0;
int lastPercent = 0;
while ((count = fis.read(b)) != -1) {
bytesDownloaded += count;

/* *************eventually fails here after the first few writes */
os.write(b, 0, count);

os.flush();
}
fis.close();
os.close();
InputStream is = urlConnection.getInputStream();