[appengine-java] Re: Using Serializable object in session

this is more a java question than GAE question check out this http://java.sun.com/developer/technicalArticles/Programming/serialization/ -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-

[appengine-java] Re: Simple data model

depends on the shape of your data. If there are only limited number of books (less than 5000) then you can simply store a key ListProperties, and bulk fetch Book entities at the same time. If it is possible for a user to read more than that, then you shall think about associated entity or relati

[appengine-java] Sharing jsession between frontend and backend?

I've got a public backend instance that I'd like to share the user session (java sessions are enabled for app) from the frontend with so that the user doesn't have to log in separately on the backend. The intent is that the backend will handle a few reporting pages that are memory intensive on the

[appengine-java] Simple data model

Hi there, I can not get my head around the datastore. Just want to have a list of users Entity: Users - name - Address - Read books // how to link to Books in low-level api Entiry: Books - History - Sports - Religion Should "Books" be in the Entity group, or by itself and then select from the

[appengine-java] Unable to find the webapp directory

hi i have just installed the java sdk. after extracting the files from the appengine-java-sdk-1.3.0 jar, I am trying to start the server with at the command line with the following: C:\Program Files\GoogleAppEngine\appengine-java- sdk-1.3.0\bin>dev_appserver.cmd C:\Program Files\GoogleAppEngine

[appengine-java] Unable to find the webapp directory Files\GoogleAppEngine\appengine- java-sdk-1.3.0\demos\guestbook\war

hi i have just installed the java sdk. after extracting the files from the appengine-java-sdk-1.3.0 jar, I am trying to start the server with at the command line with the following: C:\Program Files\GoogleAppEngine\appengine-java- sdk-1.3.0\bin>dev_appserver.cmd C:\Program Files\GoogleAppEngine

[appengine-java] Would the following create problems for me in Google app engine?

I have a Java application that has approximately 100 users. In this application there is a table that would have the equivalent of 100,000 entities added per day, ie 100 users each doing 1000 inserts per day. >From time to time I will need to output a CSV file that shows one months worth of entrie

[appengine-java] Checking if I understand transactions correctly

I am writing some code that needs to do a rollback on a secondary object/table should the transaction fail, I believe this can be done via entity groups, however I am not sure if this is how it would be implemented. I have written some sample code to check if what I would be doing is correct? Woul

[appengine-java] Problems uploading to app engine

I'm a developer on the application ridersofgilead, but when I try to use the toolbar inside eclipse to deploy the application I get this error Unable to update: java.io.IOException: Error posting to URL: https://appengine.google.com/api/appversion/create?app_id=ridersofgilead&version=3&; 404 Not F

[appengine-java] Getting STREAMED error whne trying to read InputStream

I am getting a STREAMED error when trying to read the InputStream from a POSTed HttpServletRequest. It worked perfectly in 1.3, but it is not working in 1.5. The following is the code: public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOExc

[appengine-java] Ghost entities. I can see entities in the 'Datastore Viewer' but they doesn't appear with a query

Hi, I have a very strange problem. In my database I have Entities I can see in the "Datastore Viewer" but do not appear in queries. It only happens with certain entities, but I have no way of knowing which. The solution to appear is very simple yet very strange. I edit the entity from the datastore

[appengine-java] Problem With JPA and Google Engine

Hello, i have a problem With JPA and Google Engine, i have one trial web application http://jocual.appspot.com/index.jsp and it works good with JDO but when i use JPA it report the next error: Caused by: java.lang.NoClassDefFoundError: javax/persistence/spi/ ProviderUtil at com.google.appe

[appengine-java] Channel API (Java) doesn't work locally, but in production mode.

Hey folks. I know that I'm not the first one who is facing this problem. There is a similar thread, but I don't think it's exactly the same problem. I'm working on a project including GAE + GWT. We are using gwt-gae-channel (http://code.google.com/p/gwt-gae- channel/) to send different messages fr

[appengine-java] Re: FileWriteChannel writeChannel throwing java.io.IOException?

The error: 1. E2011-05-27 07:41:59.139 org.gonevertical.core.server.jdo.data.base64.WriteBase64 writeToBlob: writeToBlob(): Error 5: java.io.IOException 2. E2011-05-27 07:41:59.149 org.gonevertical.core.server.jdo.data.base64.WriteBase64 decode: com.google.appengine.a

[appengine-java] Is Google planning to offer HR datastore migration feature

I would like to switch from M/S datastore to HR datastore, buut how should I do this? Is Google planning to offer HR datastore migration feature? -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to

[appengine-java] [mapreduce] Global limitation on concurrent mapper jobs performance

We are testing the mass creation of a very large number of entities in the datastore (several billions). We use csv files (approx. 100 Mb each), uploaded into the blobstore, and run mapper jobs on them. Our goal : minimize the overall execution time (whatever the cost). There seems to be an over

[appengine-java] Gmail IMAP and SMTP using OAuth

Hi Guys, Anyone knows about integrating Gmail IMAP and SMTP using OAuth on GAE. Both of them using sockets. Also if I use GAE Mail java API to send mails, from address(sender) becoming an issue as only the app developers email address can be added. Basically my app is integrated to Google APP