from:"AJ Chen"

Re: [appengine-java] log4j init fails

2010-03-11 Thread AJ Chen

I have the default log4j.properties in WEB-INF/classes dir. but the warning
always comes up. the file is visible because I can change the log level to
ERROR to get rid of the warning.
-aj

On Fri, Feb 19, 2010 at 7:24 PM, Rusty Wright rwright.li...@gmail.comwrote:

I think you can simply put the log4j.properties file in the WEB-INF/classes
dir and you don't need any appengine-web.xml stuff for it. Log4j looks for
its configuration file on the classpath which means it looks in
WEB-INF/classes (and also in all of the jars in the lib directory).

AJ Chen wrote:

I have log4j config in appengine-web.xml,
system-properties
property name=java.util.logging.config.file
value=WEB-INF/logging.properties/
property name=log4j.configuration
value=file:WEB-INF/classes/log4j.properties/
property name=monitor.config.file
value=WEB-INF/monitor.properties/
/system-properties
but GAE still complains about it:
log4j:WARN No appenders could be found for logger
(DataNucleus.Connection).
log4j:WARN Please initialize the log4j system properly.

Is there anything else that should be set?

thanks,
-aj

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Re: [appengine-java] log4j init fails

2010-03-11 Thread AJ Chen

yes, log4j.properties is copied by the build. the app uses it. the warning
message is weird. thanks.

On Thu, Mar 11, 2010 at 8:10 AM, Rajeev Dayal rda...@google.com wrote:

If you have your log4j.properties file at the root of your source tree, it
should automatically be copied over to war/WEB-INF/classes whenever Eclipse
performs a build of your project; you should not have to copy it over
manually.

I'm not sure why you're getting the error with regard to
Datanucleus.Connection; I've added Don to this thread; he may have some
insight into this.

On Thu, Mar 11, 2010 at 3:33 AM, AJ Chen ajc...@web2express.org wrote:

I have the default log4j.properties in WEB-INF/classes dir. but the
warning always comes up. the file is visible because I can change the log
level to ERROR to get rid of the warning.
-aj

On Fri, Feb 19, 2010 at 7:24 PM, Rusty Wright rwright.li...@gmail.comwrote:

I think you can simply put the log4j.properties file in the
WEB-INF/classes dir and you don't need any appengine-web.xml stuff for it.
Log4j looks for its configuration file on the classpath which means it
looks in WEB-INF/classes (and also in all of the jars in the lib directory).

AJ Chen wrote:

Is there anything else that should be set?

thanks,
-aj

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Re: [appengine-java] Re: GAE Alternatives?

2010-02-24 Thread AJ Chen

It depends on your app. For small business app, you may check out force.com,
which offers free developer account. I use both GAE and force.com because
I'm excited about connecting google cloud with salesforce cloud. but, GAE's
current state of reliability and performance is a bit concern. Hope GAE
grows up faster.
-aj

On Wed, Feb 24, 2010 at 3:20 PM, Larry Cable larry.ca...@gmail.com wrote:

I have to concur with Corby on this ... I was initially attracted to
the end-to-end
solution that GAE offered integrated as it is with Eclipse.

In practice I have found it very frustrating to develop on GAE because
of:

- the class white list and 3rd party framework usage (i.e Spring)

- the truly frustrating metering exceptions that the Datastore and
Servlet container throw,
coding around those is painful... you have to invent your own
transaction compensation...
- the lack of any Java based bullk load facility for DS (I had to
write my own)
(which is when you trip up over the metering exceptions...)

- the limitations of mapping BigTable under JPA/JDO

- the paucity of debugging on the production server (the log WUI is
woeful for this)

We have reached the stage with our app where we will probably move it
off GAE and onto EC2 where despite the
additional work involved in dealing with AMI lifecycle vs .war we are
more in control of the underlying environment

(although I am sure there are a similar, but different, set of hiccups
and hurdles awaiting us ...)

- Larry

On Feb 24, 10:17 am, Corby cep...@gmail.com wrote:
On Feb 24, 10:39 am, A1programmer derrick.simp...@gmail.com wrote:

Are there any good alternatives to Google App Engine out there?

I am finding that I cannot rely on GAE for a production quality
environment.

I am very excited about the future of Google App Engine, but I am in
the same boat, Derrick.

I am working with a startup that tried to get up and running on Google
App Engine, but we have since migrated to Spring Cloud Foundry, which
runs on Amazon's EC2 architecture. It is a heavier-weight environment,
and the monthly costs are higher, but the development costs are much,
much cheaper, and we have far fewer unexpected Production problems.

There's a huge attraction to the tiny resource requirement to maintain
a WAR
file deployment versus the large requirements of a EC2 style VM.

I agree, but for me there is an even larger attraction to having
predictable behavior in our Production environment, and we can't
currently get that from GAE. Some people are happy with BigTable as a
general persistence solution, but we are not. The whitelisted
classloader makes every attempt to integrate with third-party
libraries an adventure. And the nature of GAE's on-demand provisioning
makes it difficult to guarantee the response times we want for our
customers.

The crushing blow to our morale is code that runs perfectly in our
development environment, but breaks when deployed to GAE.

I have a lot of faith in the Google team, and I can't wait to see what
GAE looks like a year from now. But right now, I can only recommend it
for the simplest of internal apps, nothing client-facing.

--
AJ Chen, PhD
Chair, Semantic Web SIG, sdforum.org
http://web2express.org
@web2express on twitter
Palo Alto, CA, USA
650-283-4091
*Monitoring social media in real time*

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Re: [appengine-java] Re: How to handle schema change on JDO data model class?

2010-02-22 Thread AJ Chen

Is GAE team working on implementing the JDO feature (use default value for
new field instead of throwing exception)? that will make data migration
easier.
-aj

On Mon, Feb 22, 2010 at 8:02 AM, datanucleus andy_jeffer...@yahoo.comwrote:

For example, when adding a field that uses a primitve type to an object.
You can't query all objects with JDO pretending to store them in the
recently modified object, because null cannot be asigned to the non-null
field, but you can query the objects using the low level api and set a
default value for the new field.

And in terms of the JDO implementation, the only thing needed for it
to handle that seamlessly would be to support the use of a default
value for any new field, so when reading old data that doesn't have
that field it would apply the default value to the field. This is
specifiable in JDO metadata, so is only waiting for the GAE/J plugin
to be modified to use it.

--
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Chair, Semantic Web SIG, sdforum.org
http://web2express.org
@web2express on twitter
Palo Alto, CA, USA
650-283-4091
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[appengine-java] cloud computing event: Intelligence from the Cloud

2010-02-18 Thread AJ Chen

SDForum's next event will talk about google cloud computing and
intelligence. AppEngine team member Wesley Chun will present app engine. Andrew
Lampitt from Jaspersoft will talk about BI and cloud. I thought some of you
might be interested in the topic.  Time: 6:30-9pm, March 3rd, 2010.
Location: palo alto.  See event description below and details on sdforum.org
website.
http://sdforum.org/index.cfm?fuseaction=Page.viewPagepageId=656parentID=483nodeID=1

*Intelligence from the Cloud*

The computing cloud is forming on top of the web. It's going to change the
way we  develop and use applications. This event, Intelligence from the
Cloud will look at the connection between the cloud and web intelligence.
The focus will be the new infrastructures available today that are enabling
easy creation and consumption of web intelligence and semantics in the
cloud.

Wesley Chun from Google AppEngine Team will introduce Google App Engine
platform, an application development and hosting platform that lets you
build  deploy web applications on Google's high-traffic infrastructure. App
Engine executes apps (written in Python or Java) on servers that use the
same technology that powers Google's websites for speed and reliability.
There is no need to think about virtual machine images or disk
requirements... you just provide the code. This is a high-level talk
introducing attendees to Google App Engine, including its components and
architecture as well as some of its most popular developer APIs, such as
memcache, users (Google accounts), email, URLFetch, XMPP, Blobstore, etc.
Time-permitting we'll go through a simple example using Python.

The terms “Business Intelligence,” “Semantics,” “Analytics,” and “Cloud”
mean a variety of things to different audiences. Andrew Lampitt from
Jaspersoft and zAgile will give a sweeping view of  these topics and show
how they mesh together to solve real-world problems today. Jaspersoft
enables easy deployment of business intelligence to the Infrastructure as a
Service (IaaS) cloud as well as a semantic layer to shield business users
from technical jargon of the underlying physical database. zAgile delivers
an ontology-driven context server that enables semantic integration of
enterprise information across tools and applications, and it can also act as
the comprehensive semantic description of the complete information
architecture. A combination of Jaspersoft and zAgile technologies delivers
the most leading edge semantically driven business intelligence solution as
well as deep, contextual collaboration for business intelligence consumers.
Case studies will explore how customers are applying the latest techniques
to solve painful problems in an elegant and affordable way, that simply were
not possible just a couple years ago.

Wondering what's behind the Cloud? Aliens and Intelligence.


Hope to see some of you on the event.
Best,
AJ
-- 
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Chair, Semantic Web SIG, sdforum.org
http://web2express.org
@web2express on twitter
Palo Alto, CA, USA
650-283-4091
*Monitoring social media in real time*

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[appengine-java] how to do initialization at startup?

2010-02-17 Thread AJ Chen

For standard web app, I use a context listener servlet to do initialization
at startup. This also works in eclipse with GAE plugin, i.e. the context
listener is called only once at startup. But, it does not work in production
because the context listener servlet is called frequently. It seems GAE
restarts the context or something that triggers the call to the listener
servlet. SO, the question is:  what's the right way to do one-time
initialization (e.g. pre-load data) in GAE? Maybe GAE does not have the
concept of initialization. Any suggestion is appreciated.
-aj

-- 
AJ Chen, PhD
Chair, Semantic Web SIG, sdforum.org
http://web2express.org
@web2express on twitter
Palo Alto, CA, USA
650-283-4091
*Monitoring social media in real time*

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Re: [appengine-java] how to do initialization at startup?

2010-02-17 Thread AJ Chen

thanks,

On Wed, Feb 17, 2010 at 12:29 AM, Stephan Hartmann hartm...@metamesh.dewrote:

Your app becomes shut down if it does not receive any requests for some
time. After that, the next request will initiate a new startup sequence, so
the implementation of the servlet spec is correct.

You should also implement ServletContextListener.contextDestroyed() to
perform cleanup of your data, if needed.

Regards,
Stephan

2010/2/17 AJ Chen ajc...@web2express.org

For standard web app, I use a context listener servlet to do
initialization at startup. This also works in eclipse with GAE plugin, i.e.
the context listener is called only once at startup. But, it does not work
in production because the context listener servlet is called frequently. It
seems GAE restarts the context or something that triggers the call to the
listener servlet. SO, the question is: what's the right way to do one-time
initialization (e.g. pre-load data) in GAE? Maybe GAE does not have the
concept of initialization. Any suggestion is appreciated.
-aj

--
AJ Chen, PhD
Chair, Semantic Web SIG, sdforum.org
http://web2express.org
@web2express on twitter
Palo Alto, CA, USA
650-283-4091
*Monitoring social media in real time*

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Re: [appengine-java] Re: how to do initialization at startup?

2010-02-17 Thread AJ Chen

yes, the new console is a good addition. however, because the app can be
shutdown/restarted by GAE at any time, you would still need to put the
initialization code in context listener (or similar place) so that it will
be called automatically when the app is restarted.

I just realize a potential major issue in GAE environment, which may require
some paradigm shift in server programming (at least to me). Usually, one the
server side, you may have a singleton class to keep some data objects
closeby as well as updating the data at run time. The data may change so
fast that they are conveniently kept in memory for some time before put into
permanent storage. This is safe because the web server does not kill the app
at will. Now that GAE may kill the app and restart it at any time, keeping
data in memory becomes a big potential problem because the data will be gone
after the app starting. This means you would have to save the new data into
datastore immediately. If you have lots of intermediate data or temporary
data, you have to save them to datastore immediately as well. This
always-using-datastore situation created by GAE may slow down some
applications in addition to a lot more coding for storage.

Without knowing what exactly happens when GAE automatically shutdowns the
app, my worry may be wrong. Does anyone see the similar issue? Any
suggestion for safely keeping data in memory?

-aj

On Wed, Feb 17, 2010 at 10:00 AM, Vlad Skarzhevskyy
skarzhevs...@gmail.comwrote:

There is an Custom Admin Console pages in new SDK 1.3.1.
I think the best place to preload the data to your application is
using servlet/page exposed in this Console.

--
AJ Chen, PhD
Chair, Semantic Web SIG, sdforum.org
http://web2express.org
@web2express on twitter
Palo Alto, CA, USA
650-283-4091
*Monitoring social media in real time*

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Re: [appengine-java] Re: how to do initialization at startup?

2010-02-17 Thread AJ Chen

There is significant difference between dealing with infrequent crash event
and dealing with frequent shutdown by GAE. The difference is huge when you
want to have some intermediate data in memory for performance reason. When
there is a system crash, you just start over, which is tolerable in most
cases. Restarting app by GAE is a total different story because it makes
storing data in memory no longer a valid approach. For my google app, I see
it is restarted by GAE even after a few minutes. My usual singleton object
become useless because the data objects it holds are recreated every few
minutes. This is why I think GAE's frequent restart behavior is a constraint
forcing me (probably other developers) to change design pattern, which may
be good or bad.

In this case, the change is not good, I'm afraid. Let's look at the counter
example. Normally it's trivial to keep a counter of some sort on the
server. But in GAE, it's non-trivial. You can't get a total count from
datastore easily and storing a counter in memory is not reliable. SO, you
have to do some creative work-around as proposed in GAE documentation.

Am I making sense? In any case, I'm hoping someone has an easy/reliable way
to keep tracking a counter in memory within GAE. I'll appreciate any
suggestion.

-aj

On Wed, Feb 17, 2010 at 1:56 PM, Stephan Hartmann hartm...@metamesh.dewrote:

Hi AJ,

Your consideration is not specific to GAE. You always have the potential
risk that a server could crash and then all your unstored data changes will
get lost.
So for critical data you should use a write-through cache. However, in a
distributed environment like GAE (but not specific to GAE, every standard
conform servlet container will support this) you have to take special care
to keep the caches of all nodes in sync, or just use a distributed cache
like Memcache in GAE.

Regards,
Stephan

2010/2/17 AJ Chen ajc...@web2express.org

I just realize a potential major issue in GAE environment, which may
require some paradigm shift in server programming (at least to me). Usually,
one the server side, you may have a singleton class to keep some data
objects closeby as well as updating the data at run time. The data may
change so fast that they are conveniently kept in memory for some time
before put into permanent storage. This is safe because the web server does
not kill the app at will. Now that GAE may kill the app and restart it at
any time, keeping data in memory becomes a big potential problem because the
data will be gone after the app starting. This means you would have to save
the new data into datastore immediately. If you have lots of intermediate
data or temporary data, you have to save them to datastore immediately as
well. This always-using-datastore situation created by GAE may slow down
some applications in addition to a lot more coding for storage.

Without knowing what exactly happens when GAE automatically shutdowns the
app, my worry may be wrong. Does anyone see the similar issue? Any
suggestion for safely keeping data in memory?

-aj

On Wed, Feb 17, 2010 at 10:00 AM, Vlad Skarzhevskyy
skarzhevs...@gmail.com wrote:

There is an Custom Admin Console pages in new SDK 1.3.1.
I think the best place to preload the data to your application is
using servlet/page exposed in this Console.

--
AJ Chen, PhD
Chair, Semantic Web SIG, sdforum.org
http://web2express.org
@web2express on twitter
Palo Alto, CA, USA
650-283-4091
*Monitoring social media in real time*

[appengine-java] unexpected execution of task queue

2010-02-16 Thread AJ Chen

I have a queue to run a task every hour by adding a new task (ETA=60min)
after the current task is finished. It works fine in eclipse, but it behaves
unexpectedly on production. The task is actually run every minute or so even
though ETA time on the task queues console indicates it should be executed
in 1 hour or so.  And, the number of tasks keeps growing.  I understand ETA
is not exact, but 1 min actual is just too far from 60 min ETA.  Any idea
how to make the scheduled task more reliable?

the app is at http://realmon9.appspot.com

thanks,
-aj--
AJ Chen, PhD
Chair, Semantic Web SIG, sdforum.org
http://web2express.org
@web2express on twitter
Palo Alto, CA, USA
650-283-4091
*Monitoring social media in real time*

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Re: [appengine-java] Re: queue task timeout

2010-02-05 Thread AJ Chen

This must be it since timeout occurs only when multiple tasks are fired at
the same time. thanks,
-aj

On Thu, Feb 4, 2010 at 6:11 PM, cowper iamco...@gmail.com wrote:

I believe that this may be due to the fact that the URL you are
requesting is on the local SDK server, which is single threaded and as
you are already using the only thread for the original request you get
the timeout ...

On Feb 1, 11:23 pm, AJ Chen ajc...@web2express.org wrote:
I'm using queued tasks to fetch feeds, one feed per task. each task takes
about a couple of seconds. but, the tasks get unexpected timeout easily
with
the following error message. any idea how task timeout happens? is it
possible to control the timeout period? thanks,

com.google.appengine.api.urlfetch.dev.LocalURLFetchService.fetch(LocalURLFetchService.java:223)
at

com.google.appengine.api.labs.taskqueue.dev.UrlFetchJob.execute(UrlFetchJob.java:53)
at

com.google.appengine.api.labs.taskqueue.dev.UrlFetchJob.execute(UrlFetchJob.java:46)
at org.quartz.core.JobRunShell.run(JobRunShell.java:195)
at

org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:520)

-aj--
AJ Chen, PhD
Chair, Semantic Web SIG, sdforum.orghttp://web2express.org
@web2express on twitter
Palo Alto, CA, USA
650-283-4091
*Monitoring social media in real time*

--
AJ Chen, PhD
Chair, Semantic Web SIG, sdforum.org
http://web2express.org
@web2express on twitter
Palo Alto, CA, USA
650-283-4091
*Monitoring social media in real time*

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[appengine-java] queue task timeout

2010-02-01 Thread AJ Chen

I'm using queued tasks to fetch feeds, one feed per task. each task takes
about a couple of seconds. but, the tasks get unexpected timeout easily with
the following error message. any idea how task timeout happens? is it
possible to control the timeout period? thanks,

Feb 2, 2010 7:00:54 AM org.quartz.core.JobRunShell run
SEVERE: Job feed-fetch.task4 threw an unhandled Exception:
com.google.apphosting.api.ApiProxy$ApplicationException: ApplicationError:
2: Received exception executing http method POST against URL
http://127.0.0.1:/task: Timeout waiting for connection
at
com.google.appengine.api.urlfetch.dev.LocalURLFetchService.fetch(LocalURLFetchService.java:223)
at
com.google.appengine.api.labs.taskqueue.dev.UrlFetchJob.execute(UrlFetchJob.java:53)
at
com.google.appengine.api.labs.taskqueue.dev.UrlFetchJob.execute(UrlFetchJob.java:46)
at org.quartz.core.JobRunShell.run(JobRunShell.java:195)
at
org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:520)

-aj--
AJ Chen, PhD
Chair, Semantic Web SIG, sdforum.org
http://web2express.org
@web2express on twitter
Palo Alto, CA, USA
650-283-4091
*Monitoring social media in real time*

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Re: [appengine-java] log4j init fails

Re: [appengine-java] log4j init fails

Re: [appengine-java] Re: GAE Alternatives?

Re: [appengine-java] Re: How to handle schema change on JDO data model class?

[appengine-java] cloud computing event: Intelligence from the Cloud

[appengine-java] how to do initialization at startup?

Re: [appengine-java] how to do initialization at startup?

Re: [appengine-java] Re: how to do initialization at startup?

Re: [appengine-java] Re: how to do initialization at startup?

[appengine-java] unexpected execution of task queue

Re: [appengine-java] Re: queue task timeout

[appengine-java] queue task timeout

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