[appengine-java] BlobstoreService:Must call one of set*BlobStorage() first.

[CHEN]

i am using appengine-java-sdk-1.3.0 with eclipse now.

in my page,when i click the SUBMIT button,it shows this message:
=======================================
HTTP ERROR: 500

Must call one of set*BlobStorage() first.
RequestURI=/_ah/upload/
agtzaG9ydC1zdG9yeXIbCxIVX19CbG9iVXBsb2FkU2Vzc2lvbl9fGCsM

Caused by:

java.lang.IllegalStateException: Must call one of set*BlobStorage()
first.
        at
com.google.appengine.api.blobstore.dev.BlobStorageFactory.getBlobStorage
(BlobStorageFactory.java:24)
        at com.google.appengine.api.blobstore.dev.UploadBlobServlet.init
(UploadBlobServlet.java:88)
        at javax.servlet.GenericServlet.init(GenericServlet.java:215)
        at org.mortbay.jetty.servlet.ServletHolder.initServlet
(ServletHolder.java:433)
        at org.mortbay.jetty.servlet.ServletHolder.getServlet
(ServletHolder.java:342)
        at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
463)
=======================================

Form:
=======================================
....
<%@ page
        import="com.google.appengine.api.blobstore.BlobstoreServiceFactory"%>
<%@ page
import="com.google.appengine.api.blobstore.BlobstoreService"%>
<%
        BlobstoreService blobstoreService = BlobstoreServiceFactory
                        .getBlobstoreService();
%>
<form:form
        action="<%= blobstoreService.createUploadUrl("/story_add.do") %>"
        method="post" enctype="multipart/form-data" commandName="theStory">
....
=======================================


Receiver:
=======================================
        @RequestMapping(value = "/story_add.do", method = RequestMethod.POST)
        @ModelAttribute("theStory")
        private ShortStory add(ShortStory shortStory, Model model,
HttpServletRequest request) {
                Map<String, BlobKey> blobs = blobstoreService.getUploadedBlobs
(request);
                BlobKey blobKey = blobs.get("file");
                if (blobKey != null) {
                        shortStory.setFile(blobKey);
                }
.....
=======================================


what's the wrong?thank you very much.

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