haha ! My god I can't believe it was so easy ! I think I was probably over
thinking it.
Yes so the only reason why the app engine side was returning this 404 code
is because I was created the upload url on random names instead of giving
it the servlet name "upload".
Thank you so much :-)
On Friday, 9 March 2012 12:03:18 UTC, Stuart Langley wrote:
>
> It looks like the URL that you specified for the callback in
> createUploadURL does not exist - there's a 404 when we try and call it.
>
> On Friday, 9 March 2012 22:39:58 UTC+11, Killian wrote:
>>
>>
>> The appid is linguabox10
>>
>> In the mean time I deleted the blobs which I had uploaded and since
>> yesterday when I click on the blob viewer in the app engine dashboard I get
>> a message
>> "Oops! We couldn't retrieve your list of Kinds."
>>
>> I'm not sure if these issues are related?
>>
>> Thanks for your help
>>
>> Killian
>>
>> On Friday, 9 March 2012 11:04:30 UTC, Stuart Langley wrote:
>>>
>>> You said the blob ends up in the blobstore but your webhook is not
>>> called?
>>>
>>> What's the appid?
>>>
>>> On Friday, 9 March 2012 21:32:58 UTC+11, Killian wrote:
>>>>
>>>> Hi Stuart,
>>>>
>>>> Yes apologies if I wasn't clear.
>>>>
>>>> On the app engine side of things I'm calling createUploadURL and
>>>> placing the resulting url in the task payload as follows:
>>>>
>>>> BlobstoreService blobstoreService =
>>>> BlobstoreServiceFactory.getBlobstoreService();
>>>>
>>>> String uploadURL = blobstoreService.createUploadUrl("/"+url);
>>>>
>>>> task.payload(uploadURL);
>>>>
>>>>
>>>> Alternatively, would anyone know of sample code in java trying to
>>>> programmatically upload blobs from an external app (posting a response to
>>>> a
>>>> pull task queue) might make things easier. I'm surprise I couldn't find
>>>> anything like that on the web.
>>>>
>>>> In a nutshell all I'm trying to do is reproduce the architecture of the
>>>> first pull task system presented in the Google I/O talk
>>>> http://youtu.be/AM0ZPO7-lcE in java, to place a response to the pull
>>>> task queue for the app engine app to consume.
>>>>
>>>> Thanks for your help :-)
>>>>
>>>>
>>>>
>>>> On Thursday, 8 March 2012 22:13:45 UTC, Stuart Langley wrote:
>>>>>
>>>>> Is that the actual code?
>>>>>
>>>>> You need to call createUploadURL for each blob you want to upload.
>>>>>
>>>>> On Friday, 9 March 2012 00:03:43 UTC+11, Killian wrote:
>>>>>>
>>>>>> Hi Lads,
>>>>>>
>>>>>> This issue has been bugging me for a while now and just wasted the
>>>>>> last 2 days with no solution found. I'm getting desperate at this stage
>>>>>> !
>>>>>>
>>>>>> My aim was to use the Task Queue Pull service to run some NLP
>>>>>> processing outside of app engine on an external VM. That's working fine
>>>>>> however all the trouble started when I discovered that the output
>>>>>> produced
>>>>>> by the external VM could be fed back into the Task Queue. Following the
>>>>>> example in the Google I/O video http://youtu.be/AM0ZPO7-lcE , I then
>>>>>> decided to provide the response of the task queue as a Blob upload to
>>>>>> the
>>>>>> app engine.
>>>>>> So I have the working example
>>>>>> http://code.google.com/appengine/docs/java/blobstore/overview.htmlimplement
>>>>>> and working perfectly. (ie: I can manually upload a file using
>>>>>> the jsp form and store it).
>>>>>>
>>>>>> The problem is that for obvious reasons I need to send this post
>>>>>> request from the VM programmatically. And that's were things start
>>>>>> getting
>>>>>> messy. Since the video only provides an example in Python and not in
>>>>>> java
>>>>>> I've been struggling find a solution to this.
>>>>>>
>>>>>> Looking around it seems like I need the httpcomponents-client-4.1.3
>>>>>> apache library to create post requests.
>>>>>> So this is the workflow I have:
>>>>>> I generate the upload url from the app engine side and place it in
>>>>>> the task queue payload which is then retrieved by the VM correctly.
>>>>>>
>>>>>> on the VM side this is what I do:
>>>>>>
>>>>>> String uploadURL =
>>>>>> "http://<host>/_ah/upload/agtsaW5ndWFib3gxMHIbCxIVX19CbG9iVXBsb2FkU2Vzc2lvbl9fGAEM"
>>>>>> ;
>>>>>>
>>>>>> DefaultHttpClient httpclient = new DefaultHttpClient();
>>>>>>
>>>>>> HttpPost method = new HttpPost(uploadURL);
>>>>>>
>>>>>> MultipartEntity entity = new MultipartEntity();
>>>>>>
>>>>>> File f = new File("dummyFileToUpload.txt");
>>>>>>
>>>>>> FileBody fileBody = new FileBody(f);
>>>>>>
>>>>>> entity.addPart("myFile", fileBody);
>>>>>>
>>>>>> method.setEntity(entity);
>>>>>>
>>>>>> HttpResponse response = httpclient.execute(method);
>>>>>>
>>>>>> System.out.println(response.getStatusLine());
>>>>>>
>>>>>> PROBLEM:
>>>>>>
>>>>>> When I do this both in development mode or production mode, I receive
>>>>>> a "http 404 not found" response. and it seems like the upload servlet
>>>>>> isn't
>>>>>> run at all (if I'm in deug mode for instance). However when I look in
>>>>>> the
>>>>>> blob store, the blob was indeed uploaded correctly which is good news of
>>>>>> course however it means I can't get a proper response from the app
>>>>>> engine
>>>>>> side and more importantly can't run anything in the upload servlet.
>>>>>>
>>>>>> I'm guessing my post request mustn't be created properly which would
>>>>>> explain why the app engine side is reacting weird? Is there anything
>>>>>> obviously wrong in my approach?
>>>>>>
>>>>>> Would really appreciate any advice on this.
>>>>>>
>>>>>> Thanks in advance :-)
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>
--
You received this message because you are subscribed to the Google Groups
"Google App Engine for Java" group.
To view this discussion on the web visit
https://groups.google.com/d/msg/google-appengine-java/-/9uCD5Ve1g-oJ.
To post to this group, send email to google-appengine-java@googlegroups.com.
To unsubscribe from this group, send email to
google-appengine-java+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/google-appengine-java?hl=en.
