Josh Rehman
Tue, 16 Mar 2010 14:00:01 -0700
Do you think I should file a bug?
On Sun, Mar 14, 2010 at 1:24 PM, JavaJosh <javaj...@gmail.com> wrote:
> Hi there,
>
> I'm new to Google App Engine, and was wondering what I'm doing wrong.
> In my application, users upload (potentially large) images into the
> Blobstore. I also need to create a thumbnail image that is 300px wide
> (and high enough to maintain aspect ratio). Although
> ImagesServiceFactory.makeImageFromBlob(blobKey) returns an Image
> that's not null, when I try to access width and height properties of
> the returned image I get an UnsupportedOperationException "No image
> data is available.".
>
> Here is the simplest code I can think of to reproduce (this is based
> on blobstore example; to make it work setup that example, then add a
> web.xml entry for this servlet and then change the "upload" servlet
> mapping to point to it):
>
> import java.io.IOException;
> import java.util.Map;
> import java.util.logging.Logger;
>
> import javax.servlet.ServletException;
> import javax.servlet.http.HttpServlet;
> import javax.servlet.http.HttpServletRequest;
> import javax.servlet.http.HttpServletResponse;
>
> import com.google.appengine.api.blobstore.BlobKey;
> import com.google.appengine.api.blobstore.BlobstoreService;
> import com.google.appengine.api.blobstore.BlobstoreServiceFactory;
> import com.google.appengine.api.images.Image;
> import com.google.appengine.api.images.ImagesServiceFactory;
>
>
> public class ImageBlobBug extends HttpServlet {
> private static final long serialVersionUID = 1L;
> private BlobstoreService blobstoreService =
> BlobstoreServiceFactory.getBlobstoreService();
> private static final Logger log =
> Logger.getLogger(ImageBlobBug.class.getName());
>
> public void doPost(HttpServletRequest req, HttpServletResponse res)
> throws ServletException, IOException {
> Map<String, BlobKey> blobs =
> blobstoreService.getUploadedBlobs(req);
> BlobKey blobKey = blobs.get("myFile");
> Image image =
> ImagesServiceFactory.makeImageFromBlob(blobKey);
>
> res.sendRedirect("#"+ (image == null ? "Image could not be
> made from
> blob":"Image successfully retrieved with height: " +
> image.getHeight()));
> }
>
> }
>
> Here is the stacktrace:
>
> java.lang.UnsupportedOperationException: No image data is available.
> at
> com.google.appengine.api.images.ImageImpl.updateDimensions(ImageImpl.java:
> 130)
> at
> com.google.appengine.api.images.ImageImpl.getHeight(ImageImpl.java:
> 63)
> at ImageBlobBug.doPost(ImageBlobBug.java:27)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
> at
> org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
> 487)
> at
> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:
> 362)
> at
> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:
> 216)
> at
> org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:
> 181)
> at
> org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:
> 712)
> at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
> 405)
> at
>
> com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:
> 70)
> at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:268)
> at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:126)
> at
>
> com.google.appengine.api.blobstore.dev.UploadBlobServlet.handleUpload(UploadBlobServlet.java:
> 368)
> at com.google.appengine.api.blobstore.dev.UploadBlobServlet.access
> $000(UploadBlobServlet.java:72)
> at com.google.appengine.api.blobstore.dev.UploadBlobServlet
> $1.run(UploadBlobServlet.java:100)
> at java.security.AccessController.doPrivileged(Native Method)
> at
>
> com.google.appengine.api.blobstore.dev.UploadBlobServlet.doPost(UploadBlobServlet.java:
> 98)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
> at
> org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
> 487)
> at org.mortbay.jetty.servlet.ServletHandler
> $CachedChain.doFilter(ServletHandler.java:1093)
> at
>
> com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:
> 51)
> at org.mortbay.jetty.servlet.ServletHandler
> $CachedChain.doFilter(ServletHandler.java:1084)
> at
>
> com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:
> 43)
> at org.mortbay.jetty.servlet.ServletHandler
> $CachedChain.doFilter(ServletHandler.java:1084)
> at
>
> com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:
> 121)
> at org.mortbay.jetty.servlet.ServletHandler
> $CachedChain.doFilter(ServletHandler.java:1084)
> at
> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:
> 360)
> at
> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:
> 216)
> at
> org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:
> 181)
> at
> org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:
> 712)
> at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
> 405)
> at
>
> com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:
> 70)
> at
> org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
> 139)
> at com.google.appengine.tools.development.JettyContainerService
> $ApiProxyHandler.handle(JettyContainerService.java:352)
> at
> org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
> 139)
> at org.mortbay.jetty.Server.handle(Server.java:313)
> at
> org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
> 506)
> at org.mortbay.jetty.HttpConnection
> $RequestHandler.content(HttpConnection.java:844)
> at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:644)
> at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
> at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
> at
> org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:
> 396)
> at org.mortbay.thread.BoundedThreadPool
> $PoolThread.run(BoundedThreadPool.java:442)
>
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