I'm doing a very simple upload form to my Google App Engine application. In the client GWT code I have something like:
final FormPanel uploadForm = new FormPanel();
uploadForm.setEncoding(FormPanel.ENCODING_MULTIPART);
uploadForm.setMethod(FormPanel.METHOD_POST);
uploadBtn.addClickHandler(new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
blobstoreUploadURLService.getBlobstoreUploadURL("/banzai/process-pdf", new AsyncCallback<String>() {
@Override
public void onFailure(Throwable caught) {
// TODO Auto-generated method stub
System.err.println("FAILURE DURING UPLOAD SERVICE");
}
@Override
public void onSuccess(String result) {
uploadForm.setAction(result);
uploadForm.submit();
}
});
}
});
And it uses a new FileUpload() to select the file. When I test it, either locally or on a deployed instance, I get the following error in the logs:
WARNING: Error for /_ah/upload/agdrYnNrYWFychsLEhVfX0Jsb2JVcGxvYWRTZXNzaW9uX18YAww java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Arrays.java:2786)
at java.io.ByteArrayOutputStream.write(ByteArrayOutputStream.java:71)
at javax.mail.internet.MimeMultipart.readTillFirstBoundary(MimeMultipart.java:316)
at javax.mail.internet.MimeMultipart.parse(MimeMultipart.java:186)
at javax.mail.internet.MimeMultipart.getCount(MimeMultipart.java:109)
at com.google.appengine.api.blobstore.dev.UploadBlobServlet.handleUpload(UploadBlobServlet.java:135)
at com.google.appengine.api.blobstore.dev.UploadBlobServlet.access$000(UploadBlobServlet.java:72)
at com.google.appengine.api.blobstore.dev.UploadBlobServlet$1.run(UploadBlobServlet.java:100)
at java.security.AccessController.doPrivileged(Native Method)
at com.google.appengine.api.blobstore.dev.UploadBlobServlet.doPost(UploadBlobServlet.java:98)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:51)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:70)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:349)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
Interestingly enough, several people seem to have run into this issue before (just look at this issue here, and you can find a few more on Google) but nobody seems to have any idea why it's happening, and some people are even suggesting it's App Engine's fault. Before I jumped to such rash conclusions, I thought I'd ask here first :)
And in case it's interesting, here's the HTTP headers of the attempted upload (a very small file), captured with HTTP Live Headers.
POST /_ah/upload/AMmfu6ZyyhSgz9uOR5VX4QBZeYADTB-aSejVvfGaogl3E_E8yPOLgtX9-0mob17IYfsaRZg-YP7aZrp1D4pDAwuKKm9CoNjeVx1eN2PwBro9x0PqXPeBLpQ/ALBNUaYAAAAATDFOaLPIvuEEhSS6F4HxMmf9xOb8lp0y/ HTTP/1.1
Host: kbskaar.appspot.com
User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.6) Gecko/20100625 Firefox/3.6.6
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Connection: keep-alive
Referer: http://kbskaar.appspot.com/
Cookie: Lastname=Wong; Firstname=Ka%20Man%20Sophia; Username=kmswong%40uwaterloo.ca
Content-Type: multipart/form-data; boundary=---------------------------168072824752491622650073
Content-Length: 57
-----------------------------168072824752491622650073--
HTTP/1.1 500 Internal Server Error
Server: Upload Server Built on Jul 1 2010 15:26:59 (1278023219)
Content-Type: text/html; charset=UTF-8
X-AppEngine-Estimated-CPM-US-Dollars: $0.375815
X-AppEngine-Resource-Usage: ms=7103 cpu_ms=16217 api_cpu_ms=0
Date: Mon, 05 Jul 2010 03:06:00 GMT
Pragma: no-cache
Expires: Fri, 01 Jan 1990 00:00:00 GMT
Cache-Control: no-cache, no-store, must-revalidate
Content-Length: 3211
----------------------------------------------------------
Please let me know if you have any ideas. Thanks!