http://code.google.com/p/googleappengine/issues/detail?id=6928
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Hi all,
I'm working with a app that has both online datastore(GAE) and an offline
datastore(HTML5 websql). So to resolve synchronizing problems, i'm trying
to implement a locking mechanism.
It should work like a semaphore, or as master-slave mechanism. User can get
the lock, and if not
2 kind errors:
java.lang.NoClassDefFoundError: Could not initialize
class guestbook.PMF
or
javax.servlet.ServletException: java.lang.ExceptionInInitializerError
All code from example guestbook!
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With millions of children, you don't want to model the 1:m relationship
with a parent list property. Instead, you can include in the child
entities a Key property pointing to the parent. Then, to find children of
a given parent, you can do a query on the children that filters on that
parent
Hello,
I have enabled async-session-persistence enabled=true / for performance
reasons.
There seems to be problem / bug in the implementation?
I'm getting many ClassCastException
com.google.apphosting.runtime.jetty.DeferredSessionTasks$DeferredDelete
cannot be cast to
There are a lot things that could trigger an error. You could have use *
resp.getWriter().println(e.getMessage());* instead of *
resp.getWriter().println(SQLException, world);* * *to see the actual
error. A few things below might trigger an error.
1.
If you have a NoClassDefFoundError then you need to mention what is
the class ... likely the cause of that error.
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since hrd is eventually consistent,
you need to restructure your app to not
immediately query the newly commited data after a transaction.
welcome to nosql
my app builds its own result page that assumes the committed data is
there.
by the time the user refreshes the page the
data is there and
The biggest question is why would you want to do this?
From the low-level api perspective, you can't have a list property with
more than 5k items. But maybe JDO models this list as a proxy to a query.
When you try to load that proxy it's going to load all 5m items out of the
datastore and you
Goal:
- Transform a request to send ~1000 emails by sending one each X seconds.
Problems found:
- Cron doesn't allow scheduling for every second (and has to be one all
the time; not just when requested;)
- Using recursive deferred tasks (the first launching the second after a
You can schedule tasks to execute in the future. It doesn't guarantee that
the task will be executed then, however. You might find the queue backed
up, in which case you'll get a long delay then all the tasks executing
rapidly.
Alternatively, you can throttle the task queue to execute once per
may i know what technique do you folks use to open the application to
particular countries users only during beta stage?
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I am using Eclipse Helios with the Google Plugin to develop my web page.
But how do i start the server from Eclipse? It says it should show up in
the console view but i can't find it.
Is there anybody out there who could help me with this setup so i can start
and stop my server from Eclipse?
May i know if memcache down and back to normal service. Will the data
inside memcache still remain or everything will be refresh to blank ?
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So fix your file permissions. The following message cannot be more
clear
access denied (java.io.FilePermission C:\ read)
Why C:\ is in the CLASSPATH only you would know
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I have a project that I created as a Google Web Application
project. To start my server, I select that project, right click,
and choose Run As - Web Application. To see the console, you can go
to the Window menu, choose Show View - Console. Once the server has
started, the console will have a
Hi,
Even if MemCache doesn't go down, there is no guarantee that MemCache data
will be there from one (milli)second to the next - it's a cache and its
data should be treated as entirely transitory.
To answer your original question, if MemCache went down then when it came
back it would be
Hello Everyone,
We have two Business application running on AppEngine one of which we have
upgraded into HRD instance a couple of months before and other one was
upgraded into HRD instance a week before.Everything was working fine on
them but from past few days(after Friday) no mail is sending
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