[YouTube-API] to upload image using webservice.

Hello I am making webservice for iPhone and in that i want to upload
an image in blobstore . Now the request is sended from iPhon side with
the use of uploaded url:"http://doigetit.appspot.com/_ah/upload/" and
i used that request in the below code:

public class Upload extends HttpServlet {

private BlobstoreService
blobstoreService=BlobstoreServiceFactory.getBlobstoreService();

public void doGet(HttpServletRequest req, HttpServletResponse res){
System.out.println("hello");
}

public void doPost(HttpServletRequest req, HttpServletResponse res){

EntityManagerFactory emf_upload= EMFService.get();
EntityManager em= emf_upload.createEntityManager();
HttpServletRequest rec = req;

@SuppressWarnings("deprecation")
Map<String, BlobKey> blobs= blobstoreService.getUploadedBlobs(req);
BlobKey blobKey= blobs.get("myFile");
String productid=req.getParameter("productId");

em.getTransaction().begin();
//Key k =
KeyFactory.createKey(Productrequestdetails.class.getSimpleName(),
productid);
Productrequestdetails p =
em.find(Productrequestdetails.class,"agpzfmRvaWdldGl0chwLEhVwcm9kdWN0cmVxdWVzdGRldGFpbHMY-
VUM");
p.setSzProductUrl("http://doigetit.appspot.com/serve?blob-
key="+blobKey.getKeyString());

em.merge(p);
em.getTransaction().commit();

em.clear();
em.close();

emf_upload.close();

}

}

But that code is not work and gives an error like:

java.lang.IllegalStateException: Must be called from a blob upload
callback request.
at
com.google.appengine.api.blobstore.BlobstoreServiceImpl.getUploads(BlobstoreServiceImpl.java:
158)
at
com.google.appengine.api.blobstore.BlobstoreServiceImpl.getUploadedBlobs(BlobstoreServiceImpl.java:
135)
at com.google.doigetit.Upload.doPost(Upload.java:40)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
511)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1166)
at

so, if anyone knows the idea about it then please guide me to run my
code and upload image fine.

Thanks,
Bipin Vekariya.

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