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• Java - Google App Engine - InvalidClassException when I change a class that was stored in session sc

  - by Spines

  I updated my User class, and now whenever someone that had the old version of the User class stored in their session scope accesses my site, I get an InvalidClassException. javax.servlet.ServletException: java.lang.RuntimeException: java.io.InvalidClassException: User; local class incompatible: stream classdesc serialVersionUID =…

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• Google app engine countrycode in key_name

  - by Ton

  Hi, I have a table with countrycodes, whats the best way to store these 2 digit codes, just in a regular property or in the key_name property? I thought using key_name will produce faster performance? Ton.

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• Tools to work with App Engine data dumps

  - by Thilo

  Using the bulkloader.py utility you can download all data from your application's Datastore. It is not obvious how the data is stored, however. From the looks of it, you get a SQLite file with all data in binary format in a single table: sqlite> .tables bulkloader_database_signature result sqlite> .schema result CREATE…

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• can't persist entities on app engine using jpa

  - by Bunny Rabbit

  i am trying to persist two entities(with one to many relationship) using jpa but on persit it throws an exception java.lang.IllegalArgumentException: out of field index :2 i'm struck.

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• iPhone error while importing .app into iTunes

  - by XiLei

  Hi guys, My application tester has a problem while importing .mobileprovision file into iTunes. As I don't have the device I'm not able to check things out, here is the error message: The provisioning profile "embedded.mobileprovision" could not be imported because an unknown error occurred (0xE800801A). Any idea? He is trying…

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• Ajax Form submittion in Google App Engine with jQuery

  - by user271785

  could not figure out why it is not working: i need to send request to server, generate some fragment of html in python with meanCal method, and then want that fragment embedded into submitting html file using calculation method and dynamically shows in dyContent div. all the processes are done by single click on submit button…

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• Filtering records in app-engine (Java)

  - by Manjoor

  I have following code running perfectly. It filter records based on single parameter. public List<Orders> GetOrders(String email) { PersistenceManager pm = PMF.get().getPersistenceManager(); Query query = pm.newQuery(Orders.class); query.setFilter("Email == pEmail"); query.setOrdering("Id desc"); …

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• Best tools for iPhone app wireframing?

  - by Sam

  I need to demonstrate functionality to my designer and I'm not sure what the best way to do it would be. Any suggestions?

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• App engine JPA date query

  - by waney

  Hi There. Assume I have object which represents TASK. Task have due date. How do I create query to get all tasks which are due today? Some working code like "select t from Task t where dueDate=:today" will be usefull. Thank you in advance.

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• app-engine-patch and "object_detail" view didn't work

  - by Hugh

  Hi(Sorry for my ugly english) When I calling the flowing: http://192.168.62.90:8000/blog/entry/?agphdXR1bW4xOTEychALEgpibG9nX2VudHJ5GCYM will use this: urlpatterns = patterns('', (r'^media/(?P<path>.*)$', 'django.views.static.serve', {'document_root': settings.MEDIA_ROOT, 'show_indexes': True}), (r'^$',…

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• special characters in google app-engine task queue task names

  - by antony.trupe

  Are dashes(-) or any other special characters allowed in task names in task queues?

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• Google App Engine Memcache - Sliding expiration

  - by Keyur

  Is there support for sliding expiration in the GAE MemcacheService? I can do a crude implementation where following every get() I do a put(). This will effectively reset the expiration time but this obviously is not an efficient solution. Any pointers on how I can implement this more efficiently? Thanks, Keyur

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• How to model a social news feed on Google App Engine

  - by PEZ

  We want to implement a "News feed" where a user can see messages broadcasted by her friends, sorted with newest message first. But the feed should reflect changes in her friends list. (If she adds new friends, messages from those should be included in the feed, and if she removes friends their messages should not be…

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• How can I Export local datastore data to Production Google App Engine Datastore

  - by Nitin

  Hi I wanted to export my local datastore data to my google appengine application datastore. Is there any direct and short way to do it.

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• One-to-many relationship with JDO in Google App Engine

  - by Marvin

  I've followed the GAE docs on setting up one-to-many relationship in JDO but I'm still having trouble in retrieving the collection data back. I have no problem getting the other non-collection fields back. Here are my classes: @PersistenceCapable public class User{ @PrimaryKey @Persistent(valueStrategy =…

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• Google App Engine: 403 and 404 error

  - by Peter

  Hi All, How do I implement using python if I want to manage the 403 and 404 error, for example, to know which URL is most the 403 or 404 error? Thanks in advance.

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• Google App Engine JDO error caused by GregorianCalendar ?

  - by Frank

  My class looks like this : import javax.jdo.annotations.IdGeneratorStrategy; import javax.jdo.annotations.IdentityType; import javax.jdo.annotations.PersistenceCapable; import javax.jdo.annotations.Persistent; import javax.jdo.annotations.PrimaryKey; @PersistenceCapable(identityType=IdentityType.APPLICATION)…

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• app engine jpa N-way joins ?

  - by cometta

  may i know is the latest version of jgae support N-way joins? or still limit to 2-way join? reference:…

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• Windows Azure vs Amazon EC2 vs Google App Engine

  - by iulianchira

  From a developer point of view which platform would you consider for a large social web application? If…

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• App Engine HTTP 500s

  - by pocoa

  This request caused a new process to be started for your application, and thus caused your…

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• Read a file on App Eninge with Python?

  - by PanosJee

  Is it possible to open a file on GAE just to read its contents and get the last modified tag? …

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• storage service with google app engine.

  - by Bunny Rabbit

  i've been assigned a project to create a filestorage service on google applet engine.but i am…

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• Upload and parse csv file with "universal newline" in python on Google App Engine

  - by greg

  Hi, I'm uploading a csv/tsv file from a form in GAE, and I try to parse the file with python…

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• Google App-Engine Java Group By and Count(*) queries

  - by Manjoor

  I am able to insert, filter and order records but can't use a simple count!! I am wondering…

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• Google app engine and paging

  - by klausbyskov

  How would one go about writing a query that selects items 2000-2010 out of a collection of…

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