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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 Metho

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