Re: [appengine-java] migrating to SDK 1.6.3 from 1.5.3

[Matthew Jaggard]

On Netbeans, I occasionally have to empty .netbeans/var/cache but that's
generally for IDE related issues (such as auto-completion not working) I've
never had a problem when I explicitly select "Clean" then "Build" or "Clean
Build" (which in Netbeans does the same ant tasks).


On Mar 20, 2012 2:36 PM, "doright"  wrote:

> thanks for the reply Matthew,
>
> it is indeed some sort of build problem, coz I deployed to GAE and it
> works.  But I always do a "clean build" and still get the problem on dev.
>  What do you mean by empty your caches?  I thought clean build did that -
> clearly not.
>
> cheers
> Doug
>
> On Tuesday, March 20, 2012 1:51:19 PM UTC+1, Matthew Jaggard wrote:
>>
>> This is nearly always caused by pre-compiled code being used. Empty your
>> caches and do a clean build.
>> On Mar 20, 2012 11:08 AM, "doright"  wrote:
>>
>>> It's giving me a runtime error that I don't understand:
>>>
>>> Caused by: java.lang.NoSuchMethodError: com.google.appengine.api.**
>>> datastore.DatastoreService.**beginTransaction
>>>
>>>
>>> has this been deprecated in some way?  Why no compile error?
>>>
>>>
>>> Can anyone help me understand what's going on?  Many thanks if you can..
>>>
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Re: [appengine-java] migrating to SDK 1.6.3 from 1.5.3

[Matthew Jaggard]

This is nearly always caused by pre-compiled code being used. Empty your
caches and do a clean build.
On Mar 20, 2012 11:08 AM, "doright"  wrote:

> It's giving me a runtime error that I don't understand:
>
> Caused by: java.lang.NoSuchMethodError:
> com.google.appengine.api.datastore.DatastoreService.beginTransaction
>
>
> has this been deprecated in some way?  Why no compile error?
>
>
> Can anyone help me understand what's going on?  Many thanks if you can..
>
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Re: [appengine-java] Re: Slow cold starts

[Matthew Jaggard]

I noticed that nearly all the non-tick days on the status pages say
"investigating", even going back over a year!
On Mar 20, 2012 7:21 AM, "doright"  wrote:

> I would like to add my voice to this expression of concern that Google is
> not delivering on its promises.
>
> I have been running a GAEJ Saas since the end of 2009.  On Friday I had my
> first discussion with a paying client of mine who now has serious doubts
> that my application will be able to support his business, given the
> performance he's seen in the last few weeks, notably the big delays seen on
> Friday.  I was checking the system status that day and it said "anomaly"
> across all languages and "investigating" Peformance was truly terrible with
> errors, huge latencies and lots of loading requests.  I was keen to see
> what the official investigation would turn up, but incredulous to see that
> its now just marked as a tick for that day!  To me this is a serious breach
> of trust.  It smells of cover up.
>
> I have a paid app, and have been experimenting for a while now with
> fine-tuning, min instances, max instances, pending latencies etc. I am now
> experimenting with warm-up requests but even that is not very evident, and
> I have yet to have it working. Documentation is definitely lacking in this
> crucial area.
>
> From what I read on these forums lately I see a huge amount of concern
> from the community and a deafening silence from Google.  Is this really the
> thanks we get for being early adopters and trusting Google to deliver on
> their promises?  Don't get me wrong I've been very impressed with GAE and
> the rate at which features are being rolled out, however this cannot be at
> the expense of stability and performance.  I really fear I might now lose
> everything that I've built up over the last 18 months because my client
> trust is being eroded by all of these problems.  I can't even blame Google
> coz they haven't even put out a statement.
>
> Googlers, how do I raise this to a production issue?  Its make or break
> now for my application.
>
>
>
> On Saturday, March 10, 2012 9:23:29 AM UTC+1, andrew wrote:
>>
>> Yes. More votes for a Google response on this.
>>
>> Anyone with a premium account and better support want to take up the
>> cause on all our behalf?
>>
>> Submit a defect report we can all star?
>> Please post link to it here
>>
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Re: [appengine-java] How to handle class version issues in DataStore

[Matthew Jaggard]

This answer also applies to the low level datastore and Objectify. I can
only assume JPA works the same way.
On Mar 12, 2012 7:40 AM, "andrew"  wrote:

> Nulls (Java), if the object can have null as a value. E.g. Integer can be
> null, int cannot.
>
> I think this is explained in GAE/JDO documentation.
>
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Re: [appengine-java] Other Database other than BigTable

[Matthew Jaggard]

I know very little about it, but this is the place to start...

https://developers.google.com/cloud-sql/

On 8 March 2012 07:50, ravi kumar  wrote:

> Hi..i want to use other database(not Google's Bigtable)as DBaaS for my
> application which is using google infrastructure.Is is Possible and how??
>
> --
> Thanks & Regards
> Ravi Kumar Reddy K
> +91-8095749598
>
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[appengine-java] Tasks being lost

[Matthew Jaggard]

Just before this group closes, I wanted to query whether task delivery is
guaranteed.

I'd been planning that my possibly high traffic site would track visits
using task queues like this:

For each visit, put a task in the pull queue with the relevant data in the
payload
Read 1000 tasks at a time, process them, delete them, etc. and write the
data to the datastore (potentially after several batches of 1000)

However, I have just discovered that tasks are lost when I simulate high
traffic. I have loaded 30 pages which try for 10 seconds to put as many
tasks in the queue as possible - then a separate process retrieves them and
lists how long they took to arrive.

Unfortunately, this created 12827 tasks, but only processed 9421. The
console now says I have 650 tasks still in the queue but the
queue.leaseTasks method doesn't get any.

Any thoughts?

Mat.

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Re: [appengine-java] Re: publishing html files

[Matthew Jaggard]

Have a look at the blobstore documentation, that might help you. However
I'd be inclined to mention a naughty word "Amazon" (ssh!) S3 might be the
best way forward.

On 28 February 2012 06:32, Vik  wrote:

> Any advise on this please?
>
> Thankx and Regards
>
> Vik
> Founder
> http://www.sakshum.org
> http://blog.sakshum.org
>
>
> On Sun, Feb 26, 2012 at 11:28 AM, Vik  wrote:
>
>> Hie
>>
>> I am generated html documents using a google text doc as template
>> (reading it using gdata apis and then doing some text manipulation).
>> Now, I want to publish these documents somewhere so that I can refer to
>> others giving the url of the document (which means it would be publicly
>> accessible).
>>
>> Any suggestions on how do i go about it? Like where should i host these?
>>
>>
>> Thankx and Regards
>>
>> Vik
>> Founder
>> http://www.sakshum.org
>> http://blog.sakshum.org
>>
>
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Re: [appengine-java] JPA Query setMaxResult vs DB Read Ops number

[Matthew Jaggard]

The first one :-)

On 22 February 2012 21:01, Peter Han  wrote:

> situation:
> - user entities in db (properties id, name, sex, age)
> - you want to get the oldest of them with min. age 10
>
> createQuery(select u from User u where u.age>=10 order by age desc)
> query.setMaxResults(1)  !!!
> query.getResultList();
>
> how GAE handles this situation?
>
> 1. search in index table where age>=10 and only the oldest
> 2. found 1 entity key
> 3. read entity
> 4. return entity
>
> OR
>
> 1. find all of them in index table where age>=10
> 2. found X entity keys
> 3. read all entities
> 4. return only the oldest of them (because JPA maxResults=1)
>
> Thanks
>
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Re: [appengine-java] DevServer fails after updating to java 6u31

[Matthew Jaggard]

Please search the group and bug reports before posting a new thread.

http://groups.google.com/group/google-appengine-java/browse_thread/thread/1272fe639eeef892/cd59fa14c2301f57


http://code.google.com/p/googleappengine/issues/detail?id=6928



On 23 February 2012 13:27, doom777  wrote:

> Initializing App Engine server
>[ERROR] Unable to start App Engine server
> Unable to start embedded HTTP serverjava.lang.RuntimeException: Unable to
> restore the previous TimeZone
> at
> com.google.appengine.tools.development.DevAppServerImpl.restoreLocalTimeZone(DevAppServerImpl.java:228)
> at
> com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:164)
> at
> com.google.appengine.tools.development.gwt.AppEngineLauncher.start(AppEngineLauncher.java:97)
> at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:509)
> at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1068)
> at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:811)
> at com.google.gwt.dev.DevMode.main(DevMode.java:311)
> Caused by: java.lang.NoSuchFieldException: defaultZoneTL
> at java.lang.Class.getDeclaredField(Unknown Source)
> at
> com.google.appengine.tools.development.DevAppServerImpl.restoreLocalTimeZone(DevAppServerImpl.java:222)
> ... 6 more
> [ERROR] shell failed in doStartupServer method
>
> com.google.gwt.core.ext.UnableToCompleteException: (see previous log
> entries)
> at
> com.google.appengine.tools.development.gwt.AppEngineLauncher.start(AppEngineLauncher.java:102)
> at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:509)
> at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1068)
> at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:811)
> at com.google.gwt.dev.DevMode.main(DevMode.java:311)
>
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Re: [appengine-java] max keys for memcache

[Matthew Jaggard]

"And the sql query won't be fast if there are are too many records."

I don't think this is true. The datastore speed is designed to vary with
the size of the result set, not the size of the data set.

On 23 February 2012 00:58, Kesava Neeli  wrote:

> our user account has many fields like userName, email, number, alternate
> email list, ids from social networks like facebook, google, twitter,
> linkedin etc. The primary key is one of those fields. In "realtime", we
> should be able to find if a user exists with any the fields and not just
> email. One thing I could do it td create a datastore index for each of the
> field that I want to lookup and then perform the query when needed. Having
> many indexes means more number of low level datastore write calls for each
> store hit. And the sql query won't be fast if there are are too many
> records.
>
> Anyway, thanks for your comments. I will look to see if I can design it
> differently.
>
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Re: [appengine-java] still a mess with datanucleus instead of hibernate/jpa

[Matthew Jaggard]

I'm afraid that you're not going to be able to use hibernate in the way
that you expect to. You're also not going to like the fact that the
hibernate/datanucleus change will be the least of your worries if
converting from a relational database. I advise that if you're serious
about using Google App Engine then you switch your code to using the low
level API or a simple abstraction (such as Objectify or Twig) instead of
JPA or JDO because they'll help you to change your mindset away from the
relational DB model you're use to. If however you're not serious about
using GAE - I recommend that you give up at this point.

Mat.

On 9 February 2012 11:04, oneTETSUO  wrote:

> some yrs ago, i developed an gwt and it worked well so far.
>
> now i wanted to connect my backend with a gwt.based.app and ive used
> jpa with hibernate for it. ive compiled the sources so far, to start
> them on a tomcat instance localy, but the datanucleus.provider just
> kicking it out of the way and try to parse and use the persistence.xml
> instead of the hibernate persistence provider. it reminds me very
> strong to the messy overhead of jboss seam, but in another way.
>
> 1. its a deep shit, that one cant develop gwt based app in connection
> to a usual relational database. one is pushed to use fakedate, during
> the development, which makes it not even better.
>
> 2. if it runs on the tomcat, the provider still override the
> configuration, as it wants or what. the persistence.xml shows
> 
> org.hibernate.ejb.HibernatePersistence
> 
>
> but the result is
>
> 
> 11:48:12,551 WARN  [DataNucleus.MetaData] - MetaData Parser
> encountered an error in file "file:/home/mschulz/workspace/
> _dwh_frontend/build_two/war/WEB-INF/classes/META-INF/persistence.xml"
> at line 4, column 63 : cvc-complex-type.3.1: Value '2.0' of attribute
> 'version' of element 'persistence' is not valid with respect to the
> corresponding attribute use. Attribute 'version' has a fixed value of
> '1.0'. - Please check your specification of DTD and the validity of
> the MetaData XML that you have specified.
> 
>
> no one asked datanucleus to manage the persistence, on which point it
> overtakes the focus on that ? i want to kick it out or should i move
> my whole persistence layer from hibernate to datanucleus, which makes
> another unnecessary workload on this point. if i want to speed it up
> later on, i may use datanucleus for this issue, but actualy i just
> want to develop the business case :/
>
> iam kind of sick to workaround the behaviour of this all the time, the
> plugin should give the oppurtunity to switch/case the usage of
> dependend packages to take the pain away :/ in fact, iam not in the
> scope of gae, its running on tomcat and the appenmgine dependencies
> wont realize this change. its a bit mess, to figure out, on which
> point what is used, coz no log output will give a point to dive into
> the debugger ...
>
> in the past, ill switched workspaces between front/backend
> development, but this isnt the way to work fluently with it, so one
> got an idea, how to merge/hybrid use that case.
>
>
>
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Re: [appengine-java] Google App Engine community support is moving to Stack Overflow

[Matthew Jaggard]

Hi Johan,
   I knew it's possible to identify someone's expertise - I was just asking
whether they could raise difficult issues to Google employees, but I guess
that' irrelevant if your're actively involved in answering questions
already. The only other issue I've found when using Stack Overflow is how
to get notified - at the moment I enjoy looking through the e-mails to this
group and answering any that I can. Maybe the RSS will work for me. Then
you just need to get GMail to support RSS feeds and we're sorted :-)

Thanks,
Mat.

On 7 February 2012 11:46, Johan Euphrosine  wrote:

> Hi Matthew,
>
> You can easily identify people with a specific level expertise on Stack
> Overflow by looking at their reputation or at previous questions they
> answered, and a good way to attract people on a question is to setup a
> bounty.
>
> Members of the App Engine team and the community are already active on
> Stack Overflow, just take a look at the tag statistics and hopefully you
> will recognize a few people there :)
> http://stackoverflow.com/tags/google-app-engine/topusers
>
> In the top users you can see:
> http://stackoverflow.com/users/818274/guido-van-rossum (Python and NDB
> daddy, App Engine Software Engineer)
> http://stackoverflow.com/users/12030/nick-johnson (~59K reputation, App
> Engine Developer Relations)
> http://stackoverflow.com/users/453278/dan-sanderson (Author of
> Programming Google App Engine, and working for Google)
> http://stackoverflow.com/users/280474/robert-kluin (top group contributor)
> http://stackoverflow.com/users/125967/moraes (webapp2 author)
> http://stackoverflow.com/users/62288/dave-w-smith (App Engine Software
> Engineer, working on Map Reduce and testing)
> http://stackoverflow.com/users/23786/moishe (App Engine Software
> Engineer, working on XMPP, Mail and Channel API)
> http://stackoverflow.com/users/992563/amy-u (Author Google App Engine
> Java and GWT Application Development, App Engine Developer Relations)
> http://stackoverflow.com/users/656408/proppy (myself, App Engine
> Developer Relations)
>
> And many others I must have forgotten.
>
> Hope that answers your concerns.
>
> On Tue, Feb 7, 2012 at 11:24 AM, Matthew Jaggard 
> wrote:
>
>> @Ikai - I think this is a great idea, however like Ruslan I'm a bit
>> concerned about how much Google employees will be looking at the questions.
>> Would it be possible for us to have a mechanism for raising to a Googler
>> any questions that cannot be answered by the community. As a group we're
>> able to deal with most simple problems or confirm bugs but it would be
>> great to allow certain people - or people with a specific level of
>> expertise - to bring questions to your attention.
>>
>>
>> @Ruslan - This is a good idea, raise an enhancement request and I'll
>> happily star it. Or submit a patch?
>>
>>
>> Thanks,
>> Mat.
>>
>>
>>
>>
>> On 7 February 2012 02:31, Ruslan V  wrote:
>>
>>>  Dear Ikai,
>>>
>>>
>>> Monday, February 6, 2012, 6:26:10 PM, you wrote:
>>>
>>>
>>>  It looks like your question has already been answered:
>>>
>>>
>>> http://stackoverflow.com/questions/9124564/datastore-access-is-horribly-slow-on-dev-server-if-you-have-more-than-few-object
>>>
>>> The datastore stub is that: a stub. You cannot reliable depend on it for
>>> performance data.
>>>
>>> It would be great if you guys allow engineers to replace the stub with
>>> custom implementation as it was done in gae-sqlite for Python version of
>>> SDK. Is there a chance of this happening ?
>>>
>>> /Ruslan
>>>
>>> --
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>>>
>>
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Re: [appengine-java] Google App Engine community support is moving to Stack Overflow

[Matthew Jaggard]

@Ikai - I think this is a great idea, however like Ruslan I'm a bit
concerned about how much Google employees will be looking at the questions.
Would it be possible for us to have a mechanism for raising to a Googler
any questions that cannot be answered by the community. As a group we're
able to deal with most simple problems or confirm bugs but it would be
great to allow certain people - or people with a specific level of
expertise - to bring questions to your attention.


@Ruslan - This is a good idea, raise an enhancement request and I'll
happily star it. Or submit a patch?


Thanks,
Mat.



On 7 February 2012 02:31, Ruslan V  wrote:

>  Dear Ikai,
>
>
> Monday, February 6, 2012, 6:26:10 PM, you wrote:
>
>
>  It looks like your question has already been answered:
>
>
> http://stackoverflow.com/questions/9124564/datastore-access-is-horribly-slow-on-dev-server-if-you-have-more-than-few-object
>
> The datastore stub is that: a stub. You cannot reliable depend on it for
> performance data.
>
> It would be great if you guys allow engineers to replace the stub with
> custom implementation as it was done in gae-sqlite for Python version of
> SDK. Is there a chance of this happening ?
>
> /Ruslan
>
> --
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Re: [appengine-java] writing then reading entity does not fetch entity from datastore

[Matthew Jaggard]

I hope this is a stupid question but you're not setting the read
consistency to eventual are you?
On 4 Feb 2012 01:29, "Ikai Lan (Google)"  wrote:

> Can you post the code? Are you reading by key? If you are using a query,
> you might be exposed to the eventually consistent nature of global queries
> in the datastore. Or is this only in the dev appserver?
>
> --
> Ikai Lan
> Developer Programs Engineer, Google App Engine
> plus.ikailan.com
>
>
>
> On Fri, Feb 3, 2012 at 3:56 PM, John Goche wrote:
>
>> Hello,
>>
>> I am having the following problem. I am now using the low-level
>> google datastore API rather than JDO, that way I should be in a
>> better position to see exactly what is happening in my code. I am
>> writing an entity to the datastore and shortly thereafter reading it
>> from the datastore using Jetty and eclipse. Sometimes the written
>> entity is not being read. This would be a real problem if it were to
>> happen in production code. I am using the 2.0 RC2 API.
>>
>> I have tried this several times, sometimes the entity is retrieved
>> from the datastore and sometimes it is not. I am doing a simple
>> query on the datastore just after committing a write transaction.
>>
>> (If I run the code through the debugger things run slow enough
>> that the entity has a chance of being read back on the second pass).
>>
>> Any help with this issue would be greatly appreciated,
>>
>> Regards,
>>
>> John Goche
>>
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Re: [appengine-java] Both indexes required (ASC and DESC) for 1-N relationship mapped with a List

[Matthew Jaggard]

Do you ever have criteria to your query? If so, I think you need both
indexes because below is the way that I think of queries working. I'm not
sure if it's true - maybe a Googler could let us know if this is about
right or wildly wrong?

Use ascending index to find the first entity with the value required.
Use descending index to find the last entity with the value required.
Return all entity keys between the first and the last.
If not a keys-only query - fetch the entities using a batch get.

If this is the way it works, I wouldn't be surprised if Google have set it
up to require both indexes because they would be required in all uses
(because it would probably be just as quick to do sorting in memory if you
fetch all entities).

Thanks,
Mat.

On 3 February 2012 02:04, Bruno Fuster  wrote:

> I'm not sure but maybe JDO is trying to query asceding to fetch the
> children before adding.
>
>
>
>
>
>
> On Thu, Feb 2, 2012 at 9:36 PM, Miguel  wrote:
>
>> Hi,
>> I am working on a simple structure similar to:
>>
>> class Parent {
>> ...
>> List children
>> ..
>> }
>>
>> class Child {
>> ..
>> Parent parent
>> ..
>> }
>>
>> mapped with a 1-N relation in JDO:
>> > by="parent">
>>> collection>
>>
>> 
>>
>>
>> with a simple index:
>> 
>>
>> 
>>
>> .. and I always retrieve Children in descending order.
>>
>> But when I add a children I get this error:
>> com.google.appengine.api.datastore.DatastoreNeedIndexException: no
>> matching index found.
>> The suggested index for this query is:
>>
>>
>>
>>
>> So my question is: why do I always need both indexes for ascending and
>> descending order if I need only type of ordering?
>>
>> Thanks,
>> Michele
>>
>> --
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>>
>>
>
>
> --
> Bruno Fuster
>
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Re: [appengine-java] Re: 200 was logged when, apparently, an error happened

[Matthew Jaggard]

Also, is it possible that the application caused some kind of error
while initialising but had started successfully enough to serve the request
without error?

The second log would suggest that too - your error happens at 10:45:14 and
then your successful request is at 10:45:15.

Does everything start and work correctly and without any errors on the dev
server?

2012/2/2 Ronoaldo José de Lana Pereira 

> Just another strange log: deadline exception, and 200 status code for
> response:
>
>
>1.  2012-02-02 10:45:15.116
>
> /pelotas/promocao-e-desconto/manicure--pedicure--design-de-sobrancelhas-no-centro---8201538
>200 60338ms 0kb
>
>187.45.240.38 - - [02/Feb/2012:04:45:15 -0800] "GET 
> /pelotas/promocao-e-desconto/manicure--pedicure--design-de-sobrancelhas-no-centro---8201538
>  HTTP/1.1" 200 128 - - "www.ofertaunica.com" ms=60338 cpu_ms=1210 
> api_cpu_ms=953 cpm_usd=0.033660 exit_code=104 
> instance=00c61b117c5e9499e0c235b467612a49de5c
>
> 2.  E 2012-02-02 10:45:14.377
>
>org.apache.jasper.runtime.JspFactoryImpl internalGetPageContext: Exception 
> initializing page context
>com.google.apphosting.api.DeadlineExceededException: This request 
> (a9c3fade15c22ddf) started at 2012/02/02 12:44:14.904 UTC and was still 
> executing at 2012/02/02 12:45:14.375 UTC.
>   at sun.misc.Unsafe.park(Native Method)
>   at 
> java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:226)
>   at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedNanos(AbstractQueuedSynchronizer.java:1037)
>   at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer.tryAcquireSharedNanos(AbstractQueuedSynchronizer.java:1326)
>   at 
> com.google.common.util.concurrent.AbstractFuture$Sync.get(AbstractFuture.java:258)
>   at 
> com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:91)
>   at 
> com.google.appengine.tools.development.TimedFuture.get(TimedFuture.java:41)
>   at 
> com.google.common.util.concurrent.ForwardingFuture.get(ForwardingFuture.java:63)
>   at 
> com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:90)
>   at 
> com.google.appengine.api.datastore.FutureHelper$CumulativeAggregateFuture.get(FutureHelper.java:144)
>   at 
> com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:90)
>   at 
> com.google.appengine.api.datastore.FutureHelper.getInternal(FutureHelper.java:72)
>   at 
> com.google.appengine.api.datastore.FutureHelper.quietGet(FutureHelper.java:33)
>   at 
> com.google.appengine.api.datastore.DatastoreServiceImpl$2.runInternal(DatastoreServiceImpl.java:113)
>   at 
> com.google.appengine.api.datastore.DatastoreServiceImpl$2.runInternal(DatastoreServiceImpl.java:110)
>   at 
> com.google.appengine.api.datastore.TransactionRunner.runInTransaction(TransactionRunner.java:31)
>   at 
> com.google.appengine.api.datastore.DatastoreServiceImpl.put(DatastoreServiceImpl.java:110)
>   at 
> com.google.appengine.api.datastore.DatastoreServiceImpl.put(DatastoreServiceImpl.java:94)
>   at 
> com.google.apphosting.runtime.jetty.DatastoreSessionStore.saveSession(DatastoreSessionStore.java:93)
>   at 
> com.google.apphosting.runtime.jetty.SessionManager.createSession(SessionManager.java:357)
>   at 
> com.google.apphosting.runtime.jetty.SessionManager$AppEngineSession.(SessionManager.java:130)
>   at 
> com.google.apphosting.runtime.jetty.SessionManager.newSession(SessionManager.java:288)
>   at 
> com.google.apphosting.runtime.jetty.SessionManager.newSession(SessionManager.java:43)
>   at 
> org.mortbay.jetty.servlet.AbstractSessionManager.newHttpSession(AbstractSessionManager.java:413)
>   at org.mortbay.jetty.Request.getSession(Request.java:1242)
>   at org.mortbay.jetty.Request.getSession(Request.java:1214)
>   at 
> javax.servlet.http.HttpServletRequestWrapper.getSession(HttpServletRequestWrapper.java:224)
>   at 
> javax.servlet.http.HttpServletRequestWrapper.getSession(HttpServletRequestWrapper.java:224)
>   at 
> org.apache.jasper.runtime.PageContextImpl._initialize(PageContextImpl.java:146)
>   at 
> org.apache.jasper.runtime.PageContextImpl.initialize(PageContextImpl.java:124)
>   at 
> org.apache.jasper.runtime.JspFactoryImpl.internalGetPageContext(JspFactoryImpl.java:107)
>   at 
> org.apache.jasper.runtime.JspFactoryImpl.access$000(JspFactoryImpl.java:40)
>   at 
> org.apache.jasper.runtime.JspFactoryImpl$PrivilegedGetPageContext.run(JspFactoryImpl.java:149)
>   at 
> com.google.apphosting.runtime.security.shared.intercept.java.security.AccessController_.doPrivileged(AccessController_.java:34)
>   at 
> org.apache.jasper.runtime.JspFactoryImpl.getPageContext(JspFactoryImpl.java:61)
>   at 
> org.apache.jsp.WEB_002dINF.jsp.site.oferta_jsp._jspService(oferta_jsp.java:114)
>   at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
>   at javax.servle

Re: [appengine-java] 200 was logged when, apparently, an error happened

[Matthew Jaggard]

I don't have a clue as to the answer, but to help those who might can you
tell us if it only happens during requests that are starting new instances
of your app?

2012/2/2 Ronoaldo José de Lana Pereira 

> Dear App Engine developers and googlers,
>
> Sorry for the long post, but I got something weird on my logs. A response
> status 200 was logged when, apparently, an error happened. Does it makes
> any sense, or I'm just misreading the messages from the logs? This happened
> a few times, and some requests are failing properly (500 status).
>
> Is this due the static 500 error handler configured in my
> appengie-web.xml? In this case, I guess that this is not a sucessfull
> request either, so a 500 error is more applicable and I'll get this warning
> on my error chart in the dashboard (which I'm not sure now that is
> providing the right information ...).
>
> Thanks in advance.
>
> Sample stack trace follows:
>
>
>1.  2012-02-02 10:45:15.646
>
> /guarulhos/promocao-e-desconto/lanche-natural--suco-de-400ml-no-shopping-boulevard-dvitta---10216104?categoria=gastronomia&id=1
>200 59686ms 67kb Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.7
>(KHTML, like Gecko) Chrome/16.0.912.77 Safari/535.7
>
>189.34.9.239 - - [02/Feb/2012:04:45:15 -0800] "GET 
> /guarulhos/promocao-e-desconto/lanche-natural--suco-de-400ml-no-shopping-boulevard-dvitta---10216104?categoria=gastronomia&id=1
>  HTTP/1.1" 200 67809 
> "http://www.ofertaunica.com/guarulhos/promocao-e-desconto/cheese-salada--batata-frita-no-emporio-parque-na-vila-augusta---12707408?categoria=gastronomia&id=1cheese-salada--batata-frita-no-emporio-parque-na-vila-augusta---12707408?categoria=gastronomia&id=1";
>  "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.7 (KHTML, like Gecko) 
> Chrome/16.0.912.77 Safari/535.7" "www.ofertaunica.com" ms=59687 cpu_ms=1733 
> api_cpu_ms=1057 cpm_usd=0.056004 exit_code=104 
> instance=00c61b117c7a9b197087ae4f18973656059d29
>
> 2.  W 2012-02-02 10:45:15.607
>
>A serious problem was encountered with the process that handled this 
> request, causing it to exit. This is likely to cause a new process to be used 
> for the next request to your application. If you see this message frequently, 
> you may be throwing exceptions during the initialization of your application. 
> (Error code 104)
>
>
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Re: [appengine-java] Project Design : vendors<->clients<->invoice

[Matthew Jaggard]

How many of each will you have? You need to remember that nearly all of the
costs in the datastore are per-operation charges so you need to allow for
that. For example, if you have relatively few clients / vendors you could
list them all in a single entity. (You have a 1MB limit per entity) You
might then store invoices on a second entity and put all of the product
data on the invoice - it depends on how you use products outside of the
information given. So... try this for a medium sized app

This is Objectify syntax - Objectify will put the below into two datastore
entities for you and even load other entities automatically if you want it
to - such as automatically loading the Client (and vendor which is embedded
into the Client) when you load an Invoice (along with the Products that are
embedded into the Invoice in my example).

public class Vendor
{
   String name;
   ...
}

@Entity
public class Client
{
  @Id
  String name;
  @Embed
  List vendorAccessList;
  List invoiceList;
  ...
}

@Entity
public class Invoice
{
  @Id
  Long id;
  Client for;
  @Embed
  List productList;
  List quantityList;
  BigDecimal totalPrice;
  BigDecimal tax;
  ...
}

public class Product
{
   String name;
   String description;
   BigDecimal price;
   ...
}


This schema isn't great for all purposes but might work for you, who knows.

Good:
  When you load an invoice, you can get all of the product data, in one
datastore "get".
  When you load an invoice, you can automatically load all the Client /
Vendor information in a second "get".

Bad:
  It takes a query to find all of the Clients a Vendor can access.
  Product data will be repeated when you sell the same product to another
client - and products can't exist without being attached to an invoice.
  A really big invoice might break the 1MB rule because all the product
data is stored in the same entity.


On 30 January 2012 13:14, guillaume.brus...@gmail.com <
guillaume.brus...@gmail.com> wrote:

> Small project design
>
> Hello I have got a typical project project
> vendors<->clients<->invoice<-> product
> and I would like to use the best design for better performance
>
> a) one or many vendros can access one client
>
> c) a client has one or many invoice
>
> d) invoice reffer to product
>
> I am a little bit afraid by performance for retrieving information
>
> I was thinking on creating cross references
>
>
> Vendor
> - name
> - client list
>
> Client
> - name
> - vendor list
> - invoice list
>
> Invoice
> - Number
> - ?Client ref?
>
> what do you think of that structure ?
>
> Regards
>
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Re: [appengine-java] Re: Hello world demo isn't working.

[Matthew Jaggard]

You can use JDK 7 as long as you specify a target version of Java 6.
On 29 Jan 2012 09:09, "Simon Knott"  wrote:

> It looks like you've compiled the Hello World application with JDK 7 - GAE
> only supports JDK 6 applications currently.
>
> Cheers,
> Simon
>
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Re: [appengine-java] OpenId Provider using java

[Matthew Jaggard]

Yes, I was able to log in to my development application using
http://mjaggard.openid.org.cn/ as my Open ID. Assuming I managed to
separate things correctly you should be able to use the test app I
produced. So you'd click on "OpenID" on the login page and then type in
your Open ID URL (like http://mjaggard.openid.org.cn/) and then click "Sign
in" - then you jump through all the hoops on the other end before being
returned to the app.

No apology required for your English. :-)

Mat.


On 26 January 2012 13:44, TG  wrote:

> Could you tell me if I can use any openid provider in a openid consumer
> (in GAE )?
>
> For example I tried to use a login from www.openid.org.cn in a openid
>  consumer (in Gae) and I receve
> Error: Server Error.
>
> My goal is try to use a application(in GAE) as openid consumer using
> another application in GAE as openid provider.
>
> Sorry for my English.
>
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Re: [appengine-java] uploading a new version of my app doesnt affect the running system

[Matthew Jaggard]

Could you try changing the version? I think some people have seen issues
before if I remember correctly and they resolved it by changing the version
and then setting the new version as the default.

On 26 January 2012 10:29, vega <_v...@vr-web.de> wrote:

> hi everyone
>
> when i deploy changes to the server, the upload is working ("Deployment
> completed successfully")
> but when i open a page, i get the old version of my app, not the new. also
> when i use strg+f5.
>
> the logs says for the first request after uploading the new version:
>
> "This request caused a new process to be started for your application, and 
> thus caused your application code to be loaded for the first time. This 
> request may thus take longer and use more CPU than a typical request for your 
> application."
>
> and no, ive not changed the version number of the app to 2.0 or something, 
> that i would have to select it (where so ever) in the dashboard.
>
> what to do?
>
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Re: [appengine-java] OpenId Provider using java

[Matthew Jaggard]

It is a NetBeans project, but you can also just use apache ant to compile
if you change the "appengine.location" in nbproject\ant-deploy.xml to the
path to your SDK.
ant runserver
should compile and then start the dev server although the dev server isn't
that helpful in this particular example because it doesn't implement the
full OpenID stuff.

On 26 January 2012 08:24, TG  wrote:

> It's a netbeans project?
>
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Re: [appengine-java] how to store java "Date" type in specific timezone?

[Matthew Jaggard]

You could create a sortable date format string. For example, convert the
date to GMT and store it -mm-dd hh:mm:ss.nnn then store the timezone
afterwards so you can convert back to the date/time in the timezone.
On 25 Jan 2012 19:05, "Kesava Neeli"  wrote:

> Thanks. That's what I was doing for some date fields now. Store the date
> in a well formatted string and then do conversions. But it becomes tough
> when you want to build a query "get me all records in last day" and the
> datastore for that object contains thousands of  records. With the strings,
> you need to iterate through all records, get a date and then do a
> comparison.
>
> With "date" data type, you can rely on appengine to return correct data.
>
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Re: [appengine-java] lost trying to understand JDO on BigTable: please help coding example

[Matthew Jaggard]

Do you have any good reason to have separate classes rather than one big
one with all the stuff that's in each? The main reason I ask is that
loading two entities is about twice as expensive as loading one twice the
size. If you do have a good reason, you could still persist them as a
single entity, but I'm not sure how to do this in JDO. In Objectify, you
would just @Embed one class into the other.

Mat.

On 24 January 2012 20:05, John Goche  wrote:

>
> Hello,
>
> I have the following classes in a unidirectional 1-1 relationship to each
> other:
>
> class A {
>
>B b;
>
>// ... more fields
>
> }
>
> class B {
>
>   String k;
>
>   // ... more fields
> }
>
> I want k to be the primary key for class B as well as for class A.
> How do I accomplish this task? I've been told I need to implement
> a PK class but don't understand why I would need one.
>
> Given I cannot find much information on the BigTable implementation
> I don't even know how to think about the problem (I understand RDBMS
> and think of each class as having its own table, although this may be
> wrong).
>
> Thank you for your kind help,
>
> John Goche
>
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Re: [appengine-java] OpenId Provider using java

[Matthew Jaggard]

OK. I have implemented this in my program and have it mostly working* I
have tried to separate the parts that are relevant into a separate project
and remove the branding that I don't want to give away yet. So sorry if it
doesn't work well for you but you should get the general idea of the code
required. I've also never used git before so it's not a great project yet!

https://github.com/mjaggard/AppEngine-OpenID

Let me know what you think and also if you have any more specific questions.

Thanks,
Mat.


* the only part that doesn't work well on my main application is where I
tell the user at the bottom of the page if they're logged in or not. I do
this using a browser Cookie because I don't want to make requests that need
a JVM on my main public pages.


On 23 January 2012 18:41, TG  wrote:

> I cant find a example of openId provider using java on google app engine.
>
> I only found a phyton example.
>
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Re: [appengine-java] updating a property enmass in several entity

[Matthew Jaggard]

I just thought of a better way of doing it, but it's not quite as pretty
because it breaks queries. Basically you add a new field to your entity
which could be an integer (like a version number for the entity) or a
boolean for "has had ten added to mycolumn" which defaults to false when
you load your entity (you haven't specified how you're doing this, but I'm
sure there will be a way of doing it using JDO, JPA, Low-level, objectify,
etc.) then you can check when you load it if you need to add 10 then you
can save the updated version correctly.

This method costs you nothing (not technically true, but so close to zero
it's not worth thinking about) except the loss of querying ability if you
do so on mycolumn.

I would probably add some code like this

class MyEntity
{
  ...
  int version = 0; //default to zero
  long mycolumn;
  ...
}

then when loading...

if (version == 0)
{
  mycolumn += 10;
  version = 1;
}

at a later date, you might add...
if (version == 1)
{
  someOtherColumn = someOtherColumn.toLowerCase();
  version = 2;
}

etc.

On 23 January 2012 17:51, Gal Dolber  wrote:

> If you need to do it all at once there's no secret trick or magic to do
> it. You can use backends servers, cron jobs, task queues o the
> appengine-mapper but in all cases you'll have to pay
> number_of_entities*(get_price + put_price) plus all the processing price.
>
> On Mon, Jan 23, 2012 at 1:39 PM, Matthew Jaggard 
> wrote:
>
>> Unfortunately that's basically the only option.
>>
>> Maybe someone can comment on MapReduce, although from what I understand
>> it's not any cheaper.
>>
>> On 23 January 2012 15:33, kt  wrote:
>>
>>> Hi,
>>> I have a situation where I need to update a property in several entities
>>> amass. Something similar in SQL would be :
>>> update mytable set mycolumn = (mycolumn + 10);
>>>
>>> I do not want to iterate through all entities since it will be very
>>> expensive. Any ideas?
>>>
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>
>
>
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Re: [appengine-java] updating a property enmass in several entity

[Matthew Jaggard]

Unfortunately that's basically the only option.

Maybe someone can comment on MapReduce, although from what I understand
it's not any cheaper.

On 23 January 2012 15:33, kt  wrote:

> Hi,
> I have a situation where I need to update a property in several entities
> amass. Something similar in SQL would be :
> update mytable set mycolumn = (mycolumn + 10);
>
> I do not want to iterate through all entities since it will be very
> expensive. Any ideas?
>
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Re: [appengine-java] Spring MVC

[Matthew Jaggard]

Hi Paul,
   No problem being a noob :-) Yes, you're right, just add the relevant
libraries to your project and make sure they're included in the output,
which I think is default anyway (as opposed to libraries like lombok that
are just there at compile-time)

Mat.

P.S. I'm living in Northampton at the moment but am from Norfolk
originally. I unfortunately don't have to confidence to set up a company
yet so GAE is just a hobby for me at the moment.

On 18 January 2012 21:30, Paul Ford  wrote:

> ok got it Matthew. I am a noob so excuse my ignorance, So you would apply
> the spring jar as a library reference in your say eclipse project. Compile
> your project war (which includes that spring jar) and deploy to GAE? If
> correct would the spring jar then run in the JVM container?
>
> I'm sure I'm getting my lines crossed here, so your response and patience
> is appreciated.
>
> Thanks again.
>
> BTW - From Swindon originally, but live in Chicago now. Where are you
> situated?
>
>
> On Wed, Jan 18, 2012 at 3:23 PM, Matthew Jaggard 
> wrote:
>
>> The whitelist only details JVM classes that are allowed. You can
>> including classes with your project as much as you like (as long as they
>> don't depend on the missing JVM classes) so to use Spring, you have to
>> include the spring jar file(s).
>>
>> Mat.
>> On 18 Jan 2012 20:33, "Paul Ford"  wrote:
>>
>>> Quick question:
>>>
>>> If WAR's are deployed to GAE container and the JRE white list does not
>>> contain the spring classes (or hibernate or whatever framework you
>>> pick that is outside of JRE Whitelist), how do you incorporate spring
>>> or whatever J2EE framework and it run in GAE?
>>>
>>> Thanks
>>>
>>> Paul
>>>
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>
>
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>
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>
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Re: [appengine-java] Spring MVC

[Matthew Jaggard]

The whitelist only details JVM classes that are allowed. You can including
classes with your project as much as you like (as long as they don't depend
on the missing JVM classes) so to use Spring, you have to include the
spring jar file(s).

Mat.
On 18 Jan 2012 20:33, "Paul Ford"  wrote:

> Quick question:
>
> If WAR's are deployed to GAE container and the JRE white list does not
> contain the spring classes (or hibernate or whatever framework you
> pick that is outside of JRE Whitelist), how do you incorporate spring
> or whatever J2EE framework and it run in GAE?
>
> Thanks
>
> Paul
>
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Re: [appengine-java] JPA and Entity Groups

[Matthew Jaggard]

Cough objectify cough
On 17 Jan 2012 19:49, "Paul Bartosik"  wrote:

> I have spent a bit of time banging up against Entity Group issues.  In
> all cases, the problem was with my JPA.  I had made mistakes in my
> annotations that manifested as run-time transaction and Entity Group
> errors .
>
> The documentation on JPA relationships and Entity Groups is pretty
> light.  Can someone confirm my 3 assumptions below?
>
> 1. In a bi-directional relationship, the unowned side of the
> relationship will automatically be the Parent Entity and the owned
> side will be the Child Entity.
>
> 2. In a uni-directional relationship, both sides of the relationship
> will be in different Entity Groups.
>
> 3. When using JPA, there is no other way to specify the Entity Group
> of your entities.
>
>
> Thanks for any help.
>
> -Paul
>
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Re: [appengine-java] Displaying 1000 tweets eats up datastore quotas in minutes

[Matthew Jaggard]

You're thinking far too much like an RDBMS user. Imagine for a moment that
querying a database is like picking up polystyrene balls. SQL Server or
whatever is like a vacuum cleaner, the datastore is like a pair of hands.
Picking up a million polystyrene balls with your hands is perfectly
possible but hopelessly inefficient. Picking up a really big piece of
polystyrene however is trivial, size being almost irrelevant. Equally, SQL
Server/vacuum cleaner will collect tiny parts from various places with ease.

So, in your case, I'd definitely combine multiple tweets, I might even put
all of the tweets for a user in the same entity as his other details -
login, etc. See objectify and its load groups for how to do this but
keeping logical separation in Java objects.

Mat.
On 8 Jan 2012 23:25, "Amy Unruh"  wrote:

> Serdar,
>
> If you are frequently pulling in and storing many users' Twitter streams,
> this might well require you to enable billing for your app eventually.
>  However, during initial development and testing, you can probably reduce
> costs enough to avoid that (e.g., try turning down cron frequency).  See
> also the documentation regarding billable resources (e.g.
> http://code.google.com/appengine/docs/billing.html#Billable_Resource_Unit_Cost).
>   For example, if not all properties in your entities need to be indexed,
> you can reduce your write costs by setting some to unindexed.
>
> As you comment, you ought to be able to greatly reduce the number of reads
> by using memcache.  You can use appstats (
> http://code.google.com/appengine/docs/python/tools/appstats.html) to get
> more detail on where your reads and writes are occurring.
>
> On Sun, Jan 8, 2012 at 10:09 PM, Serdar  wrote:
>
>> My app archives and displays tweets in a simple layout, which lets
>> people easily browse older tweets of Twitter users.
>>
>> This is what happens in a typical user page:
>>
>> - Get 100 more tweets via Twitter API and save to the datastore. Each
>> tweet is stored in a single Entity.
>>
>> - Get 1000 (will be 200 in the real case) tweets from the datastore
>> and display.
>>
>> These datastore reads and writes fill the limits very very quickly.
>> Even a single user (that's me testing) fills the quotas in minutes,
>> checking one or two Twitter user's tweets.
>>
>> I'll use memcache for the reads and that'll help but I don't see my
>> app could serve more than 10 users a day.
>>
>> An idea is to save, say, 100 tweets in a single Entity but that just
>> sounds not right in terms of data structure.
>>
>> How would you store and display tweets (more than 100 a page) in your
>> application? (A typical visitor would like to browse some thousands of
>> tweets.)
>>
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Re: [appengine-java] Error

[Matthew Jaggard]

Try turning the widget 3 degrees to the left.



We're going to need more information than that. "Internal server error" is
most often caused by an exception being thrown in your code and not caught
- you should see details in the error log (on production) or on the console
(on the dev server).

On 6 January 2012 07:10, VIKASH  wrote:

> I am getting error as internal server error while executing
> program 
>
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Re: [appengine-java] My Project: Forum Hosting

[Matthew Jaggard]

Also, the SSL doesn't quite work correctly. When I visit a URL like
this: https://support.fuzedtest.appspot.com/signin.html I get a
certificate error in chrome ("server's certificate does not match the
URL") despite the fact that the certificate specifies *.appspot.com -
not sure what's going on there.

On 5 January 2012 14:38, Matthew Jaggard  wrote:
> I've already done the JDO to Objectify, using Guice and am planning on
> using HRD. So, why do you use Shiro?
>
> By the way, I find the password requirements quite annoying - you have
> to specify an overly complicated password (more secure than my bank
> requires!) and you don't even tell me in advance - just a small pink
> warning at the top if I get it wrong.
>
> On 5 January 2012 14:26, objectuser  wrote:
>> My project is a forum hosting service.  I have it up in demo mode at:
>>
>> http://support.fuzedtest.appspot.com/
>>
>> The demo is limited by the free quota, but you can still create and manage
>> your own forum, register for a forum, etc.  This won't be the final
>> location: it will be abandoned once the project officially goes live.  But
>> right now I'm wondering how efficient it will be (and conversely how
>> expen$ive it will be).  I spent some significant time trying to optimize
>> datastore interactions and wonder if it was time well spent (that is, I
>> wonder if I did a good job).  Some of the discussions on cost have me
>> worried that it'll just cost too much to run.  Hope not.  And in any case,
>> there's more I can do with caching, etc.
>>
>> It went through several phases, including changing from JDO to Objectify,
>> Spring to Guice, integrating Apache Shiro, Master/Slave to HRD, leveraging
>> GWT, working within the limitations of the GAE SSL support ... hope the new
>> SSL support is released soon.
>>
>> With all of that and many other unexpected issues, I think I spend quite a
>> bit more time on "infrastructure" than on features.  Hopefully that trend
>> will reverse. I'm sure I'll have to fix and enhance the infrastructure part,
>> but I'd rather spend more time adding features people like.
>>
>> Anyway, stop by and bang on it if you feel like it.  It'll be interesting to
>> see if and when it blows the quota. :)
>>
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Re: [appengine-java] My Project: Forum Hosting

[Matthew Jaggard]

I've already done the JDO to Objectify, using Guice and am planning on
using HRD. So, why do you use Shiro?

By the way, I find the password requirements quite annoying - you have
to specify an overly complicated password (more secure than my bank
requires!) and you don't even tell me in advance - just a small pink
warning at the top if I get it wrong.

On 5 January 2012 14:26, objectuser  wrote:
> My project is a forum hosting service.  I have it up in demo mode at:
>
> http://support.fuzedtest.appspot.com/
>
> The demo is limited by the free quota, but you can still create and manage
> your own forum, register for a forum, etc.  This won't be the final
> location: it will be abandoned once the project officially goes live.  But
> right now I'm wondering how efficient it will be (and conversely how
> expen$ive it will be).  I spent some significant time trying to optimize
> datastore interactions and wonder if it was time well spent (that is, I
> wonder if I did a good job).  Some of the discussions on cost have me
> worried that it'll just cost too much to run.  Hope not.  And in any case,
> there's more I can do with caching, etc.
>
> It went through several phases, including changing from JDO to Objectify,
> Spring to Guice, integrating Apache Shiro, Master/Slave to HRD, leveraging
> GWT, working within the limitations of the GAE SSL support ... hope the new
> SSL support is released soon.
>
> With all of that and many other unexpected issues, I think I spend quite a
> bit more time on "infrastructure" than on features.  Hopefully that trend
> will reverse. I'm sure I'll have to fix and enhance the infrastructure part,
> but I'd rather spend more time adding features people like.
>
> Anyway, stop by and bang on it if you feel like it.  It'll be interesting to
> see if and when it blows the quota. :)
>
> --
> You received this message because you are subscribed to the Google Groups
> "Google App Engine for Java" group.
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> https://groups.google.com/d/msg/google-appengine-java/-/G1uS5KofZ0gJ.
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Re: [appengine-java] gae+gwt xml reading problem

[Matthew Jaggard]

Unless you have this working somewhere else, it's not relevant to this group.

Where do you have your code reading XML working already? Local app
engine? Standard Java app?
Can you post the code that's failing and any other code that's relevant?

If you can't get this working outside of the App Engine, you'll need
to get help elsewhere.

Thanks,
Mat.

On 29 December 2011 10:35, deltaaruna  wrote:
> Hi all,
>
> I tried to read a xml file using an gwt+google app engine app. But I
> am getting following exceptions
>
> No source code is available for type
> org.xml.sax.helpers.DefaultHandler; did you forget to inherit a
> required module?
> No source code is available for type javax.jdo.PersistenceManager; did
> you forget to inherit a required module?
> No source code is available for type javax.xml.parsers.SAXParser; did
> you forget to inherit a required module?
> No source code is available for type
> javax.xml.parsers.SAXParserFactory; did you forget to inherit a
> required module?
> No source code is available for type java.io.File; did you forget to
> inherit a required module?
> No source code is available for type
> javax.xml.parsers.ParserConfigurationException; did you forget to
> inherit a required module?
> No source code is available for type org.xml.sax.SAXException; did you
> forget to inherit a required module?
> No source code is available for type org.xml.sax.Attributes; did you
> forget to inherit a required module?
>
> Please someone help me.
>
> Thank You
> Aruna
>
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Re: [appengine-java]

[Matthew Jaggard]

WTF?

On 13 December 2011 14:31,  wrote:

>
> Sent from my BlackBerry® by dtac.
>
> --
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>
>

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Re: [appengine-java] Re: XML reading error.

[Matthew Jaggard]

kwanja9...@yahoo.com can you please be more careful with your blackcurrent,
you seem to be sending blank replies to lots of messages which is really
annoying.

On 13 December 2011 09:39,  wrote:

> **
> Sent from my BlackBerry® by dtac.
> --
> *From: * "M.W. Aruna Withanage" 
> *Sender: * google-appengine-java@googlegroups.com
> *Date: *Mon, 12 Dec 2011 23:53:09 -0800
> *To: *
> *ReplyTo: * google-appengine-java@googlegroups.com
> *Subject: *Re: [appengine-java] Re: XML reading error.
>
> Dear Simon,
>
> Thank you for your information
>
> On 12 December 2011 23:06, Simon Knott  wrote:
>
>> Hi,
>>
>> The GAE sandbox environment is restricted from reading arbitrary files
>> from the file system, just as the production environment is.  You need to
>> deploy the XML as part of your web application and then load the file.
>>
>> See http://code.google.com/appengine/kb/java.html#readfile for more
>> information.
>>
>> Cheers,
>> Simon
>>
>> --
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>>
>
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Re: [appengine-java] Re: Securing cron urls / task urls using UserService and not using web.xml

[Matthew Jaggard]

Raphael, is is the isUserLoggedIn() that returns false or the isUserAdmin()?
If the first returns false but the second returns true (which would make
SOME sense I guess!) then you could refactor your code to only run if
isUserAdmin() is true, rather than them both having to be true.

I have no idea, just a guess I'm afraid.

Mat.

On 9 December 2011 23:45, hendrix.jason  wrote:

> There is probably a better way, but you could look at the user agent
> string (I see in my logs that the user agent string for pages launched
> by cron look like "AppEngine-Google; (+http://code.google.com/
> appengine)".
>
> Also, cron jobs are executed as admin.  You may be able to use the
> "userService.isUserAdmin()" functionality, although I haven't tested
> that.
>
> Thanks,
> Jason
>
> On Dec 8, 5:08 am, Raphael André Bauer 
> wrote:
> > Hi,
> >
> > I am currently trying to secure my urls that are accessed by cron jobs /
> tasks.
> >
> > Normally I would use web.xml like that:
> >
> > 
> > 
> > Protected Area
> > /cron/*
> > 
> > 
> > admin
> > 
> > 
> >
> > However, I got a constraint, where these urls should be allowed to be
> > triggered by other authentification mechanisms.
> >
> > Therefore I tried to use the UserService if a authenticated user is
> > hitting the url. I though cron is an authenticated user...
> >
> > UserService userService = UserServiceFactory.getUserService();
> >
> > if (!userService.isUserLoggedIn()) {
> >
> > //do nothing
> >
> >
> >
> > } else if (!userService.isUserAdmin()) {
> > //do nothing
> > }
> >
> > //allow stuff to work...
> >
> > }
> >
> > But I do not get a logged in user when cron is programmatically hitting
> my urls.
> >
> > Is there a way to determine if google app engine is hitting my urls
> > without using web.xml security constraints?
> >
> > Thanks,
> >
> > Best,
> >
> > Raphael
>
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Re: [appengine-java] Newbie.... using Android.jar in GAE

[Matthew Jaggard]

Hi Gavin,
If I've missed something please don't be offended, but I think you're
missing the separation of Server and Client Device.
Google App Engine is all about running applications on Google's servers -
all communication with any device (Android, PC, etc.) needs to be done
using one of the pre-defined and allowed methods - most usually this is
HTTP - the main protocol used for web sites. Android's NFC classes are used
on the device for communicating with other nearby devices (ie. not GAE).

Again, sorry if it's me that's missed something.

Mat.

On 4 December 2011 14:25, Gavin Payne  wrote:

> Hi Gang..
>
> I want to get access to NDEF class and  features for NFC. These are all
> part of Android.jar
>
> I have added the jar to my project.. and all my code is compiling
> correctly.
>
> But it will not run.. I am getting some errors from the android lib...
>
> I'm guessing there is some problem using the android lib in a standard GAE
> project.
>
> Any way i can make this work?
>
> Does anyone have any experience with this?
>
> thanks
>
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Re: [appengine-java] Re: How to efficiently implement Quotas

[Matthew Jaggard]

Quite a few people seem to be using "pull" queues for this. Each time a
resource is used, you put a new item in a pull queue - you can then
periodically retrieve 1000 items from the queue in a single call and save
the information to the datastore.

On 26 November 2011 15:20, Max  wrote:

> We use memcache + datastore counter and it works quite well.  Let's say
> datastore counter will be updated every time count % 1000 == 0. then
> even the memcache crashed then you lose 1000 uncharged API call at most.
>
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Re: [appengine-java] Re: HUGE range (30 seconds+) in startup times

[Matthew Jaggard]

If you're new to the group, you may not yet know to ignore Tapir.

>From what I've seen myself and read from others, this isn't normal
behaviour. Have you looked into whether you get similar behaviour locally?
Can you time how long it takes to start the JVM and your app and respond to
a request? Maybe write a script that runs the "runserver" ant task and then
calls wget to retrieve a page once it sees :8080 in the output?

I know that people using lots of areas of the Spring framework and also
JDO/JPA see much longer startup times than those who use lightweight
frameworks. Favourites seems to be Objectify, Guice, Freemarker, Cambridge
templates, Resteasy, Htmleasy. (These are mostly frameworks to handle just
part of the task that Spring does).

Mat.

On 24 November 2011 07:53, Tapir  wrote:

> Although GAE team always says the free quotas are enough for small
> apps,
> the facts deny this conclusion from time and time.
>
> I think the main problem is the instance scheduler.
> The instance scheduler is very not smart.
>
> On Nov 24, 3:46 pm, Tapir  wrote:
> > Pay (to get more idle instances) or go.
> >
> > On Nov 24, 4:05 am, Scott Murphy  wrote:
> >
> >
> >
> >
> >
> >
> >
> > > Can someone please explain why the startup times of my app are HIGHLY
> > > inconsistent. The only access to the datastore I see is when it
> creates a
> > > session.
> >
> > > What would cause such a high variance???
> >
> > >1.
> > >   1. 2011-11-23 11:59:24.042 /_ah/warmup 200 53918ms 6kb
> > >2.
> > >   1. 2011-11-23 11:58:24.403 /_ah/warmup 500 68224ms 0kb
> > >3.
> > >   1. 2011-11-23 11:58:08.254 /_ah/warmup 200 41931ms 6kb
> > >4.
> > >   1. 2011-11-23 11:58:04.296 /_ah/warmup 200 38301ms 6kb
> > >5.
> > >   1. 2011-11-23 11:57:31.280 /_ah/warmup 200 39769ms 6kb
> > >6.
> > >   1. 2011-11-23 11:56:27.292 /_ah/warmup 200 39129ms 6kb
> > >7.
> > >   1. 2011-11-23 11:55:09.358 /_ah/warmup 200 40067ms 6kb
> > >8.
> > >   1. 2011-11-23 11:54:19.186 /_ah/warmup 200 41484ms 6kb
> > >9.
> > >   1. 2011-11-23 11:53:10.643 /_ah/warmup 200 43649ms 6kb
> > >10.
> > >   1. 2011-11-23 11:52:26.666 /_ah/warmup 200 35097ms 6kb
> > >11.
> > >   1. 2011-11-23 11:52:21.543 /_ah/warmup 200 41004ms 6kb
> > >12.
> > >   1. 2011-11-23 11:50:59.197 /_ah/warmup 200 50842ms 6kb
> > >13.
> > >   1. 2011-11-23 11:50:38.411 /_ah/warmup 200 54322ms 6kb
> > >14.
> > >   1. 2011-11-23 11:50:05.128 /_ah/warmup 500 61197ms 0kb
> > >15.
> > >   1. 2011-11-23 11:49:49.509 /_ah/warmup 200 33466ms 6kb
> > >16.
> > >   1. 2011-11-23 11:49:28.185 /_ah/warmup 200 43114ms 6kb
> > >17.
> > >   1. 2011-11-23 11:49:04.039 /_ah/warmup 200 48665ms 6kb
> > >18.
> > >   1. 2011-11-23 11:48:45.516 /_ah/warmup 200 56083ms 6kb
> > >19.
> > >   1. 2011-11-23 11:48:38.776 /_ah/warmup 200 34770ms 6kb
> > >20.
> > >   1. 2011-11-23 11:48:37.808 /_ah/warmup 200 55666ms 6kb
> > >21.
> > >   1. 2011-11-23 11:48:16.366 /_ah/warmup 200 56648ms 6kb
> > >22.
> > >   1. 2011-11-23 11:48:01.073 /_ah/warmup 200 51638ms 6kb
> > >23.
> > >   1. 2011-11-23 11:47:29.635 /_ah/warmup 200 51231ms 6kb
> > >24.
> > >   1. 2011-11-23 11:46:44.020 /_ah/warmup 500 63135ms 0kb
> > >25.
> > >   1. 2011-11-23 11:46:25.135 /_ah/warmup 500 63424ms 0kb
> > >26.
> > >   1. 2011-11-23 11:45:51.898 /_ah/warmup 200 48358ms 6kb
> > >27.
> > >   1. 2011-11-23 11:45:04.530 /_ah/warmup 200 44475ms 6kb
> > >28.
> > >   1. 2011-11-23 11:44:55.071 /_ah/warmup 200 45317ms 6kb
> > >29.
> > >   1. 2011-11-23 11:42:54.513 /_ah/warmup 200 59274ms 6kb
> > >30.
> > >   1. 2011-11-23 11:42:52.294 /_ah/warmup 200 53660ms 6kb
> > >31.
> > >   1. 2011-11-23 11:42:47.333 /_ah/warmup 200 41321ms 6kb
> > >32.
> > >   1. 2011-11-23 11:42:19.248 /_ah/warmup 500 63798ms 0kb
> > >33.
> > >   1. 2011-11-23 11:41:27.386 /_ah/warmup 200 44808ms 6kb
> > >34.
> > >   1. 2011-11-23 11:40:39.237 /_ah/warmup 200 56062ms 6kb
> > >35.
> > >   1. 2011-11-23 11:40:07.117 /_ah/warmup 200 49035ms 6kb
> > >36.
> > >   1. 2011-11-23 11:39:36.750 /_ah/warmup 200 56603ms 6kb
> > >37.
> > >   1. 2011-11-23 11:39:24.583 /_ah/warmup 200 38206ms 6kb
> > >38.
> > >   1. 2011-11-23 11:39:08.247 /_ah/warmup 200 48777ms 6kb
> > >39.
> > >   1. 2011-11-23 11:38:37.122 /_ah/warmup 200 32621ms 6kb
> > >40.
> > >   1. 2011-11-23 11:38:29.123 /_ah/warmup 200 43760ms 6kb
> > >41.
> > >   1. 2011-11-23 11:38:11.801 /_ah/warmup 200 49921ms 6kb
> > >42.
> > >   1. 2011-11-23 11:37:33.279 /_ah/warmup 200 32509ms 6kb
> > >43.
> > >   1. 2011-11-23 11:37:01.625 /_ah/warmup 200 50572ms 6kb
> > >44.
> > >   1. 2011-11-23 11:36:11.510 /_ah/warmup 200 46396ms 6kb
> > >45.
> > >   1. 2011-11-23 11:36:00.549 /_ah/warmup 200 

Re: [appengine-java] Which java framework to use?

[Matthew Jaggard]

+1 for Objectify and for Guice (which also handles some Servlet type stuff)

I'm also using Cambridge templates (at Jeff's suggestion) and I'm just
about getting there although I'm having some issues with incomprehensible
error messages - I've found all the problems so far though.

Mat.

On 21 November 2011 07:49, Guillaume Laforge  wrote:

> Hi,
>
> You might have a look at Gaelyk 1.1, which is quite lightweight:
> http://gaelyk.appspot.com/
>
> In dev mode, you can make changes and just refresh your browser, it's got
> a simple MVC approach, and lots of shortcuts and syntax sugar to make the
> GAE SDK APIs easier to use.
>
> Guillaume
>
> PS: disclaimer, I'm the author of that framework ;-)
>
>
> On Sun, Nov 20, 2011 at 12:54, sppl  wrote:
>
>> I am starting off with a new project using app engine java. I am trying
>> to decide what mvc framework to use. I went through previous messages
>> posted by group members and found this 
>> link.
>> I then narrowed down my choices to following frameworks,
>>
>> 1) Play framework - I like this framework, but it seems to have long
>> initialization time. Also the play GAE 
>> modulesupport seems to have 
>> stopped/paused.
>>
>> 2) Stripes framework - This seems to be lightweight, but it does not seem
>> to be widely used.
>>
>> 3) Slim3 - This is another lightweight framework I liked. But most of the
>> users of this framework are in japan and the useful posts seem to be hidden
>> in japanese.
>>
>> Are there any other java frameworks that work well on app engine
>> (lightweight and good startup time)? Any advices, pointers are appreciated!
>>
>>
>>  --
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>>
>
>
>
> --
> Guillaume Laforge
> Groovy Project Manager
> SpringSource, a division of VMware
>
> Blog: http://glaforge.appspot.com/
> Twitter: @glaforge 
> Google+: http://gplus.to/glaforge
>
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Re: [appengine-java] I loaded java today and now its saying it wont work

[Matthew Jaggard]

Sorry, I think you've posted to the wrong group. Are you trying to run a
Java program that you've written yourself on Google's servers? If not, then
this is not the right place to ask your question.


On 15 November 2011 21:35, slb67  wrote:

> can someone help me it says its still in the computer but I deleted it so
> what do i do now
>
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Re: [appengine-java] Backup & Restore Data

[Matthew Jaggard]

Why would it be a problem to be missing data at 14:59 in your 15:00 backup?
Presumably if you have to restore at 18:23, you'll be far more concerned
about the data missing between 15:00 and 18:23 than the data from 14:59 to
15:00?

Mat.

On 15 November 2011 15:31, mscwd01  wrote:

> Hey
>
> I'd like to make a backup of the data of my HR datastore app. I looked
> at using the remote API but it somewhat unhelpfully says:
> "If your app uses the High Replication datastore and you attempt to
> download data, you'll see a high_replication_warning error in the
> Admin Console, and the downloaded data might not include recently
> saved entities."
>
> It doesn't mention how to download data properly if you use the, now
> recommended, HR datastore - is it even possible?
>
> I'd feel much more relaxed if I knew I could create a backup and
> restore it if my live data were to become corrupt.
>
> Thanks
>
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Re: [appengine-java] JDOQL Query for missing properties

[Matthew Jaggard]

Because missing properties are not put into any index, it's not
possible to query on them. The only option is to query for every
single entity of the particular type. I guess you might need to change
your code to include those parameters and then write an update method
that you can run only once to query for all entities, update the
property and then put them back to the datastore.

Mat.

On 14 November 2011 14:12, Mr. Schtief  wrote:
> Hi,
> I have a new property on an Entity and its only set at the new ones. The old
> entites show  in the datastore viewer.
> How can i query with jdoql for entites that have  OR property>x ?
> thx in advance
> schtieF
>
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Re: [appengine-java] Error

[Matthew Jaggard]

By "happy" coincidence, I've just installed Netbeans and my code to a
new machine and had exactly the same issue. The problem is that my
default java.exe (the one that runs if you type java into a command
prompt) is a version that belongs to a JRE. The vital line in the
error log is one saying it could not find tools.jar in c:\program
files\java\jre6\lib - which it wouldn't because tools.jar is not part
of the JRE, it's part of the JDK.

I resolved this by setting my path variable to include the bin
directory of my JDK - in my case c:\program files\java\jdk1.6.0_22\bin
before the location of java.exe
I also uninstalled the JRE because I don't need it, but I guess that's optional.

On my previous dev machine I'd been using jdk7 and jre7 and had no issues.

Thanks,
Mat.

On 14 November 2011 09:23, Matthew Jaggard  wrote:
> I am using Netbeans with GAE without any issues at the moment, so it
> should work. Can you check some things please?
>
> Can you run the dev server using the command line (dev_appserver.cmd)?
> If you can, can you run your code with it?
> Have you loaded the server in Netbeans correctly - with the correct
> paths, etc. listed under "Servers" under the "Tools" menu?
> Does the file nbproject\ant-deploy.xml contain the correct path for the SDK?
>
> Thanks,
> Mat.
>
> On 14 November 2011 04:22, Emmanuel Saenz  wrote:
>> init:
>> deps-module-jar:
>> deps-ear-jar:
>> deps-jar:
>> library-inclusion-in-archive:
>> library-inclusion-in-manifest:
>> compile:
>> compile-jsps:
>> Starting Google App Engine
>> Google App Engine Start Failed
>> C:\Users\Familia\Documents\NetBeansProjects\emmanuelsaenzc\nbproject
>> \build-impl.xml:721:
>> Deployment error:
>> Google App Engine Start Failed
>> See the server log for details.
>>        at
>> org.netbeans.modules.j2ee.deployment.devmodules.api.Deployment.deploy(Deployment.java:
>> 223)
>>        at org.netbeans.modules.j2ee.ant.Deploy.execute(Deploy.java:106)
>>        at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:
>> 291)
>>        at sun.reflect.GeneratedMethodAccessor77.invoke(Unknown Source)
>>        at
>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
>> 25)
>>        at java.lang.reflect.Method.invoke(Method.java:597)
>>        at
>> org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:
>> 106)
>>        at org.apache.tools.ant.Task.perform(Task.java:348)
>>        at org.apache.tools.ant.Target.execute(Target.java:390)
>>        at org.apache.tools.ant.Target.performTasks(Target.java:411)
>>        at org.apache.tools.ant.Project.executeSortedTargets(Project.java:
>> 1399)
>>        at org.apache.tools.ant.Project.executeTarget(Project.java:1368)
>>        at
>> org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:
>> 41)
>>        at org.apache.tools.ant.Project.executeTargets(Project.java:1251)
>>        at
>> org.apache.tools.ant.module.bridge.impl.BridgeImpl.run(BridgeImpl.java:
>> 284)
>>        at
>> org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:
>> 539)
>>        at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:
>> 153)
>> BUILD FAILED (total time: 2 seconds)
>>
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Re: [appengine-java] Error

[Matthew Jaggard]

I am using Netbeans with GAE without any issues at the moment, so it
should work. Can you check some things please?

Can you run the dev server using the command line (dev_appserver.cmd)?
If you can, can you run your code with it?
Have you loaded the server in Netbeans correctly - with the correct
paths, etc. listed under "Servers" under the "Tools" menu?
Does the file nbproject\ant-deploy.xml contain the correct path for the SDK?

Thanks,
Mat.

On 14 November 2011 04:22, Emmanuel Saenz  wrote:
> init:
> deps-module-jar:
> deps-ear-jar:
> deps-jar:
> library-inclusion-in-archive:
> library-inclusion-in-manifest:
> compile:
> compile-jsps:
> Starting Google App Engine
> Google App Engine Start Failed
> C:\Users\Familia\Documents\NetBeansProjects\emmanuelsaenzc\nbproject
> \build-impl.xml:721:
> Deployment error:
> Google App Engine Start Failed
> See the server log for details.
>        at
> org.netbeans.modules.j2ee.deployment.devmodules.api.Deployment.deploy(Deployment.java:
> 223)
>        at org.netbeans.modules.j2ee.ant.Deploy.execute(Deploy.java:106)
>        at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:
> 291)
>        at sun.reflect.GeneratedMethodAccessor77.invoke(Unknown Source)
>        at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
> 25)
>        at java.lang.reflect.Method.invoke(Method.java:597)
>        at
> org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:
> 106)
>        at org.apache.tools.ant.Task.perform(Task.java:348)
>        at org.apache.tools.ant.Target.execute(Target.java:390)
>        at org.apache.tools.ant.Target.performTasks(Target.java:411)
>        at org.apache.tools.ant.Project.executeSortedTargets(Project.java:
> 1399)
>        at org.apache.tools.ant.Project.executeTarget(Project.java:1368)
>        at
> org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:
> 41)
>        at org.apache.tools.ant.Project.executeTargets(Project.java:1251)
>        at
> org.apache.tools.ant.module.bridge.impl.BridgeImpl.run(BridgeImpl.java:
> 284)
>        at
> org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:
> 539)
>        at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:
> 153)
> BUILD FAILED (total time: 2 seconds)
>
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Re: [appengine-java] Re: Improved query planner in SDK 1.6.0

[Matthew Jaggard]

Is this on the Dev server or the production system?
Do you see the behaviour on the other system (dev/production)?
Can you see the data using the Datastore viewer? (at
https://appengine.google.com/ on production or /_ah/admin/datastore on
your local dev server)
What code are you using to try and retrieve the data?
Are you using Query or Get?


On 10 November 2011 04:03, VIKASH PATEL  wrote:
> Hello Mat,
> I am using following code to create data in table .. and data are created
> successfully i can see it.
> But now  i am not able to edit or delete these data ...
>  Key guestbookKey = KeyFactory.createKey("TableMaster", "tblTableMaster");
>         Date date = new Date();
>         Entity greeting = new Entity("Company", guestbookKey);
>         greeting.setProperty("cNo", no);
>         greeting.setProperty("cName", name);
>         greeting.setProperty("cDate", date);
>         DatastoreService datastore =
> DatastoreServiceFactory.getDatastoreService();
>         datastore.put(greeting);
>
> these will call every time  when user will fill the form with related fields
> and click on insert... so data will be inserted but then no edition or
> deletion for particular data ..
> Please help ,me for this please..
>
> thanks,
> Vikash Patel
>
> On Thu, Nov 10, 2011 at 4:32 AM, Emanuele Ziglioli
>  wrote:
>>
>> So, from what I see, my query (that uses two simple indexes istead of
>> one complex one) fails 4 or 5 times then succeeds. I'm testing on the
>> local server with the latest SDK 1.6.0.
>>
>> The funny thing is that if I change the number of rows I fetch, that
>> query also fails 5 times (or a number of seconds) before it starts
>> working!!
>>
>> I don't know if I can log the GQL that goes out to show you
>>
>> On Nov 10, 10:54 am, Emanuele Ziglioli 
>> wrote:
>> > Just tried again, now it seems to be working!
>> >
>> > On Nov 10, 10:49 am, Emanuele Ziglioli 
>> > wrote:
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> > > It's not working for me either, using Siena:
>> >
>> >
>> > > >http://groups.google.com/group/siena-discuss/browse_thread/thread/b41...
>> >
>> > > On Nov 10, 2:14 am, Matthew Jaggard  wrote:
>> >
>> > > > Hi VIKASH,
>> > > >    It looks like you've replied to an unrelated message. If this is
>> > > > not the case, please clarify. Otherwise, please repost a new thread
>> > > > and give more detail.
>> >
>> > > > What are you trying to do?
>> > > > What have you tried?
>> > > > Are you using the low level API, JDO or JPA?
>> > > > Post the relevant bit of your code too if possible.
>> >
>> > > > Thanks,
>> > > > Mat.
>> >
>> > > > On 9 November 2011 12:47, VIKASH PATEL 
>> > > > wrote:
>> >
>> > > > > Hello Friends,
>> >
>> > > > > Can anyone have idea for working with datastore.
>> > > > > I am able to create key and entity in data store but i am not able
>> > > > > to edit
>> > > > > or delete the created data..
>> > > > > so if any one has then pls help me
>> >
>> > > > > On Wed, Nov 9, 2011 at 3:12 PM, Mos 
>> > > > > wrote:
>> >
>> > > > >> Does the improved query planner reduce the need of managing
>> > > > >> indexes
>> > > > >> manually in the datastore-index.xml file?
>> >
>> > > > >> I'm a bit confused.
>> > > > >> The documentation is not obvious for me.
>> >
>> > > > >> In local development mode  I set autoGenerate="false" and delete
>> > > > >> the
>> > > > >> datastore-index-auto.xml.
>> > > > >> My application runs fine.
>> >
>> > > > >> Deploying on GAE I've got the annoying
>> >
>> > > > >> com.google.appengine.api.datastore.DatastoreNeedIndexException:
>> > > > >> no
>> > > > >> matching index found.
>> >
>> > > > >> exception.
>> >
>> > > > >> Hence, how does the improved query planner change the workflow of
>> > > > >> a GAE
>> > > > >> developer?
>> >
>

Re: [appengine-java] Improved query planner in SDK 1.6.0

[Matthew Jaggard]

Hi VIKASH,
   It looks like you've replied to an unrelated message. If this is
not the case, please clarify. Otherwise, please repost a new thread
and give more detail.

What are you trying to do?
What have you tried?
Are you using the low level API, JDO or JPA?
Post the relevant bit of your code too if possible.

Thanks,
Mat.

On 9 November 2011 12:47, VIKASH PATEL  wrote:
> Hello Friends,
>
> Can anyone have idea for working with datastore.
> I am able to create key and entity in data store but i am not able to edit
> or delete the created data..
> so if any one has then pls help me
>
>
> On Wed, Nov 9, 2011 at 3:12 PM, Mos  wrote:
>>
>> Does the improved query planner reduce the need of managing indexes
>> manually in the datastore-index.xml file?
>>
>> I'm a bit confused.
>> The documentation is not obvious for me.
>>
>> In local development mode  I set autoGenerate="false" and delete the
>> datastore-index-auto.xml.
>> My application runs fine.
>>
>> Deploying on GAE I've got the annoying
>>
>> com.google.appengine.api.datastore.DatastoreNeedIndexException: no
>> matching index found.
>>
>> exception.
>>
>> Hence, how does the improved query planner change the workflow of a GAE
>> developer?
>>
>> Cheers
>> Mos
>>
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Re: [appengine-java] Re: Templating Frameworks

[Matthew Jaggard]

Hi Daniel,
   Thanks for that - really helpful and I'll be sure to look carefully
at that option. One metric that you miss out and I consider important
for GAE is start-up time. How long does it take from starting the JVM
to serving the first template? At the moment, the majority of my
requests don't really have a UI as such (they're basically static
pages) but the admin interface uses the StringBuilder method I
mentioned - the last thing I want is to slow down my main application
for ease of programming the admin interface.

Thanks,
Mat.

On 9 November 2011 08:49, Daniel Florey  wrote:
> You can check out our comparison page for the different engines available:
> http://code.google.com/p/jmte/wiki/Comparison
>
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[appengine-java] Templating Frameworks

[Matthew Jaggard]

Please forgive the slightly off-topic post, but what framework do you
use for templates in GAE? I'm guessing lots of you will use GWT and
some will use templates as part of a larger framework.

I'm thinking of using Apache Velocity for my GAE application, but
basically I want the system to be as lightweight as possible.
At present, I build the majority of the result as a StringBuilder
which I output at the end along with the header and footer - not ideal
I know, but I doubt there are many systems as light as that.

Mat.

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Re: [appengine-java] Uploading Java classes

[Matthew Jaggard]

A quick google search returns quite a few options for this. I searched
for rpc servlet json and came up with loads of examples. Also, there's
a big list at the bottom of the Wikipedia page
http://en.wikipedia.org/wiki/JSON-RPC

On 2 November 2011 18:52, sdor...@rhainc.com  wrote:
> I have a Java class written that has a function that returns the value
> I want. Now I would like to upload my Java class to my application and
> call the Java class using either JSON or cURL. Would this be possible?
>
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Re: [appengine-java] Displaying GIF images in google app engine

[Matthew Jaggard]

You may need to put quotes around the URL (it's best practise to even
when it works without) - the same is true for the other attributes -
also the tag name and attributes should be in lower case. I'd also
include an end-of-tag character for this. So...



I suspect the difference between your JSP working elsewhere and not on
GAE is the characters used in the URL for the image. Perhaps the new
image location includes a space or an equals sign.

Thanks,
Mat.

On 2 November 2011 22:58, jyoerye  wrote:
> Hi,
> I have this link 
> http://www.worldatlas.com/webimage/countrys/africa/lgcolor/cmcolor.gif
>  stored in the datastore.I need to display it.The output is  a gif
> image.
> How should I do this in Google app engine.
>
> This code   which  ALT="some text"
> WIDTH=500 HEIGHT=500> which works  in jsp does not work in this.
>
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Re: [appengine-java] Data Importing from Oracle Database

[Matthew Jaggard]

Yes, there's really only one acceptable way of doing this - set up a
webservice program somewhere else (maybe near the database) that will
possibly do some of the processing or just return the data over HTTP
to your GAE app. GAE has the ability to do HTTP requests but not
socket connections.

This might not be trivial, but you can then compress / process the
data near to the database and then you can return the data in a good
non-RDMS form for GAE and return it a SOAP API or possibly some
webservice that your IDE can create automagically.

Thanks,
Mat.

On 4 November 2011 08:22, Jyothi Sridhar  wrote:
> Hi,
>
>  I have recently started with the GoogleAppEngine. My requirement is
> to develop an application in GAE that interacts with third party
> application's database and sync the data into the Google DataStore and
> then process the data in my GAE application. I am using Java framework
> for developing my application in GAE. When I use OracleDataSource in
> my class, I get the following error:
> java.net.Socket is a restricted class. Please see the Google  App
> Engine developer's guide for more details.
>
>    My application has to frequently fetch the sales order data from
> the third party application and then process the sales orders. Is
> there a way of addressing this problem?Kindly help.
>
> Thanks,
> Jyothi
>
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Re: [appengine-java] Re: Wrap the blobstore upload

[Matthew Jaggard]

"from the API I see this task could be a problem"

Why? I can't see obvious blocking issues but there are some clear
challenges. Maybe raise an enhancement request if you have specifics?

Also, why do you want a RESTful web-service? Is there a problem having
a slightly more relaxed attitude like GET => requests that do not
change state, POST => requests that do change state?

Mat.

On 7 November 2011 08:55, Miguel  wrote:
> any news regarding this issue? ..
>
> On Oct 26, 2:16 am, Miguel  wrote:
>> .. with a RESTful web-service.
>> I was wondering if anyone has tried to do something similar ..
>>
>> In fact I am interested in creating a whole RESTful implementation
>> with Google App Engine as backend and from the API I see this task
>> could be a problem
>>
>> Thank you,
>> Michele
>
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Re: [appengine-java] Re: Users changing data

[Matthew Jaggard]

When I view using the datastore viewer, I can only see the e-mail
address of the user (plus the ID of the entity and the encoded key +
write ops).

The User I'm saving is the one that I get from
userService.getCurrentUser() on the dev server and I'm the comparing
the difference in ID from user.getUserId() before and after saving
to/loading from the datastore.

On 4 November 2011 18:30, Ikai Lan (Google)  wrote:
> Yeah, that's weird. When you look at http://localhost:8080/_ah/admin, which
> user ID is it?
> Also ... are those the IDs the dev server is giving you? The dev_server
> should be giving pretty simple IDs, if I'm not mistaken.
>
> --
> Ikai Lan
> Developer Programs Engineer, Google App Engine
> plus.ikailan.com | twitter.com/ikai
>
>
> On Fri, Nov 4, 2011 at 7:35 AM, Mat Jaggard  wrote:
>>
>> I can now confirm that I do not see this behaviour in production -
>> only on the dev server.
>>
>> On Nov 4, 9:01 am, Matthew Jaggard  wrote:
>> > Sure, thanks Ikai, I should have done this first time around.
>> >
>> > When putting the entity (code from around my app stuck together)
>> >
>> > log("Storing user {0}", us.getCurrentUser().getUserId());
>> > DatastoreServiceConfig DATASTORE_CONFIG =
>> > DatastoreServiceConfig.Builder.withDeadline(5);
>> > DATASTORE_CONFIG.readPolicy(new
>> > ReadPolicy(ReadPolicy.Consistency.EVENTUAL));
>> > DatastoreService ds =
>> > DatastoreServiceFactory.getDatastoreService(DATASTORE_CONFIG)
>> > Entity e = new Entity("UserForTesting");
>> > e.setProperty("User", us.getCurrentUser());
>> > ds.put(e);
>> >
>> > In a separate request (and I am sure that I'm looking at the same
>> > object!) (Dull Java code removed)
>> >
>> > PreparedQuery pq = ds.prepare(new Query("UserForTesting"));
>> > ...
>> > pq.asIterable()
>> > ...
>> > e.getProperties()
>> > ...
>> > log(u.getUserId());
>> > log('/');
>> > log(u.getNickname());
>> > ...
>> >
>> > On 4 November 2011 01:05, Ikai Lan (Google)  wrote:
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> > > Can you post code? It's not clear to me what you're doing.
>> > > --
>> > > Ikai Lan
>> > > Developer Programs Engineer, Google App Engine
>> > > plus.ikailan.com | twitter.com/ikai
>> >
>> > > On Thu, Nov 3, 2011 at 4:39 PM, Mat Jaggard 
>> > > wrote:
>> >
>> > >> I have an entity that stores a user, however the user gets changed.
>> > >> When I put the entity in to the local datastore, the ID is like this
>> > >> 18530476822013922411 but when I get it out the ID is like this
>> > >> -1403876245. I haven't tried on production.
>> >
>> > >> Any ideas what's causing the issue? Have I done something wrong?
>> >
>> > >> Thanks,
>> > >> Mat.
>> >
>> > >> --
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Re: [appengine-java] Re: "Error: Server Error" occurs when login using OpenID using GAE/J

[Matthew Jaggard]

Excellent but...
a. Why?!
b. Where's the documentation?!


On 4 November 2011 12:49, Koen Maes  wrote:
> fixed it by providing simply the domain as openid idenitty and NULLs for the
> other params :
> loginUrl = userService.createLoginURL(request.getOriginalRef().toString(),
> null, domain, null);
>
>
> :-D
>
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Re: [appengine-java] Re: "Error: Server Error" occurs when login using OpenID using GAE/J

[Matthew Jaggard]

Ah, yes. I saw your original post but couldn't see why it would be
happening - it wasn't an error I came across when getting mine
working.

The code I use for Google accounts (regardless of whether they're apps
or not) is like this...

UserService us = UserServiceFactory.getUserService();
response.sendRedirect(us.createLoginURL(nextPageURL, null,
"https://www.google.com/accounts/o8/id";, null));

When I tried with https://www.google.com/a/mydomain.com/o8/ud?be=o8
(with or without the be=o8 bit) instead of
https://www.google.com/accounts/o8/id I get a 500 error and nothing in
the logs - literally nothing, even when showing "All requests"!

The error is on this page...
http://myapp.mydomain.com/_ah/login_redir?claimid=https://www.google.com/a/mydomain.com/o8/ud&continue=http://myapp.mydomain.com/public/loggedin?continue=http%3A%2F%2Fmyapp.mydomain.com%2Fadmin%2Fhome

If you did use the method I've used, you could check the domain of the
user after they're logged in I guess?

Thanks,
Mat.

On 4 November 2011 10:03, Koen Maes  wrote:
> Relevant code?
>
> * at startup, first thing that happens is a redirect like in case parameter
> "domain" is present, otherwise I sent 401 - Unauthorized. The redirect seems
> to cause the server error.
>
> Set attributesRequest = new HashSet();
>
> attributesRequest.add("openid.mode=checkid_immediate");
>
> attributesRequest.add("openid.ns=http://specs.openid.net/auth/2.0";);
>
> String loginUrl =
> userService.createLoginURL(request.getOriginalRef().toString(), domain,
> "https://www.google.com/a/"; + domain + "/o8/ud", new HashSet());
>
> response.redirectTemporary(loginUrl);
>
> * Has it ever worked?
>
> No, only using dev server, this is the first deploy. I tried re-deploying
> without luck
>
> * What have you tried?
>
> I wonder what other options I have to try ?
>
> * When do you get the error?
>
> Immediately and always
>
> * All accounts or just one OpenID provider?
>
> It is intended to work with any Google Apps domain - a future apps
> marketplace application
>
> * Any stack trace printed or errors shown in the logs?
>
> Nothing whatsoever
>
> * Does your authentication work OK on the development server?
>
> Yes
>
> * Why are these questions in order of length, even though I typed themas I
> thought of them?
>
> LOL
>
> One more thing :
> navigating to data store admin on the backend gives me this error :
>
> Error: Not Found
>
> The requested
> URL /_ah/login_required?continue=http://ah-builtin-python-bundle-dot-latest-dot-koma-software-3.appspot.com/_ah/datastore_admin/ was
> not found on this server.
>
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Re: [appengine-java] Re: "Error: Server Error" occurs when login using OpenID using GAE/J

[Matthew Jaggard]

I'm successfully using OpenID and have signed in this morning. Can you
give some more details please?

Relevant code?
Has it ever worked?
What have you tried?
When do you get the error?
All accounts or just one OpenID provider?
Any stack trace printed or errors shown in the logs?
Does your authentication work OK on the development server?
Why are these questions in order of length, even though I typed them
as I thought of them?

On 4 November 2011 09:42, Koen Maes  wrote:
> did you ever get by this error ? same thing happens to me today!
>
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Re: [appengine-java] Users changing data

[Matthew Jaggard]

Sure, thanks Ikai, I should have done this first time around.

When putting the entity (code from around my app stuck together)

log("Storing user {0}", us.getCurrentUser().getUserId());
DatastoreServiceConfig DATASTORE_CONFIG =
DatastoreServiceConfig.Builder.withDeadline(5);
DATASTORE_CONFIG.readPolicy(new ReadPolicy(ReadPolicy.Consistency.EVENTUAL));
DatastoreService ds =
DatastoreServiceFactory.getDatastoreService(DATASTORE_CONFIG)
Entity e = new Entity("UserForTesting");
e.setProperty("User", us.getCurrentUser());
ds.put(e);


In a separate request (and I am sure that I'm looking at the same
object!) (Dull Java code removed)

PreparedQuery pq = ds.prepare(new Query("UserForTesting"));
...
pq.asIterable()
...
e.getProperties()
...
log(u.getUserId());
log('/');
log(u.getNickname());
...

On 4 November 2011 01:05, Ikai Lan (Google)  wrote:
> Can you post code? It's not clear to me what you're doing.
> --
> Ikai Lan
> Developer Programs Engineer, Google App Engine
> plus.ikailan.com | twitter.com/ikai
>
>
> On Thu, Nov 3, 2011 at 4:39 PM, Mat Jaggard  wrote:
>>
>> I have an entity that stores a user, however the user gets changed.
>> When I put the entity in to the local datastore, the ID is like this
>> 18530476822013922411 but when I get it out the ID is like this
>> -1403876245. I haven't tried on production.
>>
>> Any ideas what's causing the issue? Have I done something wrong?
>>
>> Thanks,
>> Mat.
>>
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Re: [appengine-java] Re: many different Properties or Entity for name/value pairs

[Matthew Jaggard]

>From previous threads, it seems that the datastore prefers few large
entities to more smaller ones - this is also reflected in pricing, you
pay per operation as well as per byte. Storing a Map of Name->Value is
exactly what the datastore is made for.

I did talk to Jeff at Objectify about this (because I'm using
Objectify for all my other entities) and he said that although this
use case is probably valid and I'm (clearly now) not the only one
doing it, making Objectify handle this case would complicate it too
much. I think I agree with this, especially since the datastore
handles properties like this so nicely.

In addition, I can now make use of Objectify's CachingDatastoreService
which means I don't have to worry about Memcache :-)

One thought - can you search based on an item in a collection? If not
and you do need to search based on these values, you might need to be
more creative about how to split them.
MyName->MyValue1
and
MyName->MyValue2
which might become...
MyName->Collection([MyValue1, MyValue2])
or perhaps...
MyName.1->MyValue1
and
MyName.2->MyValue2
if MyName.1 will never be a property name itself, and you can deal
with parsing this.

Thanks,
Mat.

On 4 November 2011 07:53, Mister Schtief  wrote:
> hi gerald,
>
> thx for your answer but this is the ugliest solution ;) why serializing all
> pairs and storing them in one.property  it will never be searchable...
>
> using one entity property for every map.entry or using one entity of a key
> value pair type, thats the question ;)
>
> schtief
>
> Am 04.11.2011 07:10 schrieb "Gerald Tan" :
>>
>> You can serialize a Map property into a byte array to be
>> stored in the entity
>> The easiest way to do this would be to use Objectify with the @Serialized
>> annotation
>>
>> http://code.google.com/p/objectify-appengine/wiki/IntroductionToObjectify#@Embedded
>>
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Re: [appengine-java] many different Properties or Entity for name/value pairs

[Matthew Jaggard]

I have an entity that has a class containing a Map
called data - I then convert this to an entity using the method below

private Entity toEntity()
{
Entity entity = new Entity(KIND, this.getName());
if (data == null || data.isEmpty())
{
return entity;
}
for (Map.Entry> paramEntry : this.data.entrySet())
{
if (paramEntry.getKey() == null || paramEntry.getValue() == 
null ||
paramEntry.getValue().isEmpty())
{
continue;
}
entity.setUnindexedProperty(paramEntry.getKey(), 
paramEntry.getValue());
}
return entity;
}

and an opposite
private static MyClass fromEntity(Entity e)
method.

You could equally apply a collection to the map, for example the type
Map> (I've used Set because the order is not
guaranteed by App Engine). Then you could have more than one entry
with the same name - you'll just need to manage that in your classes
somehow.

Thanks,
Mat.

P.S. I know I should have used a DAO for this, but it's a quick and
dirty solution for now, I'm not sure I'll be using it long term - I
might use namespaces for the same task.

On 3 November 2011 11:23, Mr. Schtief  wrote:
> Hi,
> I'm using low level API for creating and managing Entitities. I have a Kind
> of Entity that can have unlimited name value pairs. Should i add them as
> properties or should i create a new kind of entity with the two properties
> name value and link them to the parent entity.
> putting them as properties in the parent entity seems the best way for me,
> but then i have the problem of the datastore viewer which will display all
> possible properties for all entities, so the viewer page would be very wide.
> The other problem is, that i cannot use multiple values for the same
> property name. right?
> would do you suggest
> schtieF
>
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Re: [appengine-java] 1.6.0 Prerelease SDKs are out

[Matthew Jaggard]

Regarding the index selection shown here:
http://code.google.com/appengine/articles/indexselection.html

is it possible / required to put the query in the right order to get
the best performance?

For example, if I have a lot of black and white photos and just a
handful of panoramic ones, does the first query below behave
differently compared to the second?
SELECT * FROM Photo WHERE colouration= AND
aspect= ORDER BY date_added DESC;
SELECT * FROM Photo WHERE aspect= AND colouration= ORDER BY date_added DESC;

On 1 November 2011 01:13, Marzia Niccolai  wrote:
> Hi,
> We've just uploaded the 1.6.0 Prerelease SDKs:
> http://code.google.com/p/googleappengine/downloads/list
> Please note that new features are not available in production until the
> final release, and documentation for these features will be available at
> this time as well. Let us know if there are any issues found.
> Below are the release notes for this release.
> Thanks,
> Marzia
>
> App Engine Python SDK - Release Notes
>
> Version 1.6.0
> ===
> - On November 7th, App Engine will be out of Preview. The new Terms of
> Service
>   and previously announced pricing changes will be in effect. Additionally,
> all
>   paid apps are now covered by our SLA.
> http://www.google.com/enterprise/cloud/appengine/pricing.html
> - Paid apps can now specify the maximum pending latency for instances and
> the
>   minimum number of idle instances for your application in the Admin
> Console.
> - We have released an experimental utility, available in the Admin Console,
> to
>   assist in migrating your application to the High Replication datastore.
> This
>   utility allows you to copy the bulk of your data in the background, while
> the
>   source application is still serving. You then need a brief read-only
> period to
>   migrate your application data while you copy the data that has changed
> from
>   the time the original copy started.
> - Blobstore, which was previously limited to apps with billing enabled, is
> now
>   available for all apps.
> - We have published a new article on Datastore Index Selection and Advanced
>   Search which explains our recent improvements to the query planner that
> make
>   exploding indexes unnecessary.
> http://code.google.com/appengine/articles/indexselection.html
> - Applications can now receive xmpp error stanzas at /_ah/xmpp/error.
> - In the Admin Console data viewer, you can now filter by namespace from a
> drop
>   down menu, if applicable.
> - In the Admin Console's Datastore Statistics, we now offer namespace
> suggest
>   for filtering stats.
> - We have released as experimental the full MapReduce framework.
> - The mail_stub.get_sent_messages() call now returns EmailMessage instances.
> - Fixed an issue when setting an initial_value in memcache.incr unexpectedly
>   returned a string.
> http://code.google.com/p/googleappengine/issues/detail?id=2012
> - Fixed an issue where DoS stats in the Admin Console didn't work for High
>   Replication apps.
> http://code.google.com/p/googleappengine/issues/detail?id=5237
>
> App Engine Java SDK - Release Notes
>
> Version 1.6.0
> =
> - On November 7th, App Engine will be out of Preview. The new Terms of
> Service
>   and previously announced pricing changes will be in effect. Additionally,
> all
>   paid apps are now covered by our SLA.
> http://www.google.com/enterprise/cloud/appengine/pricing.html
> - Paid apps can now specify the maximum pending latency for instances and
> the
>   minimum number of idle instances for your application in the Admin
> Console.
> - We have released an experimental utility, available in the Admin Console,
> to
>   assist in migrating your application to the High Replication datastore.
> This
>   utility allows you to copy the bulk of your data in the background, while
> the
>   source application is still serving. You then need a brief read-only
> period to
>   migrate your application data while you copy the data that has changed
> from
>   the time the original copy started.
> - Blobstore, which was previously limited to apps with billing enabled, is
> now
>   available for all apps.
> - We have published a new article on Datastore Index Selection and Advanced
>   Search which explains our recent improvements to the query planner that
> make
>   exploding indexes unnecessary.
> http://code.google.com/appengine/articles/indexselection.html
> - Applications can now receive xmpp error stanzas at /_ah/xmpp/error.
> - In the Admin Console data viewer, you can now filter by namespace from a
> drop
>   down menu, if applicable.
> - In the Admin Console's Datastore Statistics, we now offer namespace
> suggest
>   for filtering stats.
> - Added API functionality for making calls to the Memcache API
> asynchronously.
> - In the Memcache API, getIdentifiable() and putIfUntouched() now support
>   batch operations.
> - We've added a page, /_ah/admin/capabilitiesstatus, to the dev console t

Re: [appengine-java] Is threadsafe setting ignored for java applications?

[Matthew Jaggard]

Have you tried adding a different query parameter to each request?

On 27 October 2011 13:53, cryb  wrote:
> Thank you for your response... indeed, it was the browser that serialized
> all the requests (I used both Firefox 3.x and 7.x)... I've checked the app
> using wget and everything worked as expected. I didn't bother to check the
> browser because I configured Firefox to use separate brand new connections
> for each request (network.http.keep-alive = false,
> network.http.max-connections=256,
> network.http.max-connections-per-server=15) and I'm not behind a proxy...
> Anyway, it seems that for the same resource, Firefox still serializes
> requests and ignores all the above settings.
> Now, after seeing what the problem was, I've gone even further and
> configured Firefox to use http pipelining and persistent connections
> (network.http.keep-alive = true, network.http.max-connections=256,
> network.http.max-connections-per-server=15, network.http.pipelining=true)
> with no more luck: the requests for the same resource are still being
> serialized.
> Any ideas how to convince Firefox to open concurrent connections to the same
> web resource?
>
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Re: [appengine-java] Is threadsafe setting ignored for java applications?

[Matthew Jaggard]

Were all the requests sent at the same time (can you check using
wireshark or similar) or did your browser queue them - most browsers
have a "connections per server" limit as well as a total connection
limit and some will do their best to re-use a single connection where
possible.

On 26 October 2011 21:46, cryb  wrote:
> Hello.
> In order to test if  setting is working as expected, I wrote a
> small application that increments a static counter variable, sleeps for a
> couple of seconds and returns the counter's value in a web page. After that
> I've issued 15 requests in parallel from my browser (using different tabs).
> During the test, the same server instance served all my requests (as shown
> in admin console / instances)... this was also in agreement with the
> returned web pages where the counter increased from 1 to 15 (i.e. all
> requests were processed by the same server instance sharing the same static
> counter variable).
> So far, so good... the only problem was that all requests were serialized,
> as if no  setting was in place (I mention here that I've
> included  true in appengine-web.xml file)... The
> sleep time I used was 3 seconds and I had to wait about 15*3 = 45 seconds
> for the last tab to complete and to display the generated web page.
> So my question is: why does  setting seems to be ignored for
> java applications? Is there a bug in appengine system?
> Thank you.
>
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Re: [appengine-java] Optimizations with Datastore + JDO

[Matthew Jaggard]

I'm afraid I can't answer your questions directly, but I would
sincerely suggest you look at Objectify. It offers a tidy way to
migrate to using the low level datastore - and is much easier to code.
JDO feels like a square SQL peg for the round hole of NoSQL.

On 25 October 2011 03:18, Sheado  wrote:
> Hi All,
> My app uses JDO with the DataStore. When writing an Entity with ~100
> children a request could take somewhere between 3-10 seconds realtime and
> ~80331cpu_ms ~78231api_cpu_ms.
> Can these numbers be improved for writes of this size? Is there a good
> chance my requests will deadline?
> After reading the docs and watching the IO sessions, I got the following
> ideas for improving performance:
> * Using the low level api with setMulti() should clump all the writes into a
> single RPC. I'm guessing PersistenceManager isn't doing that for us with
> ArrayList<> child objects?
> * Try using the Async API
> * I couldn't find any obvious way of improving JDO write speeds
> I'd really appreciate some direction so I don't waste my time trying a
> thousand solutions. Any advice would be awesome!
> Thanks,
> Chad
> P.S. My data structure is as follows (abbreviated code):
> Parent{
> String key; // String key
> ArrayList gameData;
> ArrayList userData;
> }
> GameData{
> private Key key; private int itemType;
> private int item;
> private float ...;
> private float ...;
> private int ...
> private int ...;
> private int ...;
> private long ...;
> private int ...;
> }
> UserData{
> @PrimaryKey
> @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
> private Key key;
> private int ...;
> private String ...;
> private long ...; private boolean ...;
> }
>
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Re: [appengine-java] Re: Strange behavior with OpenID

[Matthew Jaggard]

Why would you expect to? Your application and Google are different
things so there are 4 possible states...

Logged in to Google but not your app,
Logged in to Google and your app,
Logged in to your app but not Google,
Not logged in to either.

On 26 October 2011 11:13, Miguel  wrote:
> Ok, that's what I did ..
> The problem is that I don't see the user == null when I log out from
> the OpenID provide (Gmail for example)
>
> On Oct 19, 12:05 am, Sudhakar Abraham 
> wrote:
>> Get the userService object  from the UserServiceFactory class in
>> google app engine api.   Invoke the getCurrentUser() method in
>> userService object.  Check whether the user is alive or not. if user
>> is alive call the createLogoutURL(pass_your_ logout_ url), or call the
>> createLoginURL(pass_your _login _url)  in UserService object.
>>
>> S. Abrahamwww.DataStoreGwt.com
>> Persist objects directly in Google App Engine
>>
>> //In Jsp page
>>
>> <%@ page import="com.google.appengine.api.users.User" %>
>> <%@ page import="com.google.appengine.api.users.UserService" %>
>> <%@ page import="com.google.appengine.api.users.UserServiceFactory" %>
>> <%
>> UserService userService = UserServiceFactory.getUserService();
>> User user = userService.getCurrentUser();
>> %>
>>
>> <%if (user != null) {%>
>>   
>>     Sign out <%=user.getNickname()%>
>>   
>> <%} else {%>
>>   
>>     Sign in
>>   
>> <%}%>
>>
>> On Oct 18, 12:26 pm, Miguel  wrote:
>>
>>
>>
>>
>>
>>
>>
>> > I don't understand if it is a bug or I am doing something wrong ..
>>
>> > I am using the federated login: when I logout from Google I still
>> > remain logged in my web-application.
>>
>> > I do the authentication in that way .. Is it wrong?
>>
>> > UserService userService = UserServiceFactory.getUserService();
>> > User loggedUser = userService.getCurrentUser();
>> > ..
>> > if(loggedUser!=null) {
>> > ..
>>
>> > } else {
>> > ..
>> > }
>>
>> > Even if I am logged out by google the "loggedUser" I cannot pass by
>> > the "else" statement. The loggedUser is always different from null ..
>>
>> > Why? What am I doing wrong?
>
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Re: [appengine-java] with the 1.5.5 sdk, the local_db.bin file format has changed

[Matthew Jaggard]

That would help a lot for us Netbeans users too - at present, I find
my datastore is being deleted quite often because it's put into a
folder that's deleted when the Clean Ant task runs. I haven't yet
found a work around for this (I was thinking I could copy it off
before doing the clean and copy it in if it doesn't exist when
compiling, but I failed to do that for some reason).

On 22 October 2011 01:52, Ikai Lan (Google)  wrote:
> Yeah, the local stub uses a serialized map, complete with all the caveats of
> Java serialization. There's a TODO here to use something like Derby instead,
> but that's not on the roadmap.
> --
> Ikai Lan
> Developer Programs Engineer, Google App Engine
> plus.ikailan.com | twitter.com/ikai
>
>
> On Fri, Oct 21, 2011 at 1:46 PM, Tommy Fannon  wrote:
>>
>> thank you.  i didn't think they would be that dense, but you never know.
>> the funny thing is:  i think i've taken about 10 sdks and that's the first
>> time i've seen that message.
>> i have a seed data generation program the puts test data back into my
>> local db.
>> thank you again for the reply.
>>
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Re: [appengine-java] Greetings - continuous integration with Google Eclipse plugin

[Matthew Jaggard]

The Netbeans plugin provides an Ant script.

On 18 October 2011 01:25, fkhan  wrote:
> Greeting,  as part of a class project that is using GAE and GWT via
> the Google Eclipse plugin I would like to add a continuous integration
> system like CruiseControl or Teamcity to regression test the
> application.  Both these regression applications however seem to rely
> on the build having an ANT build script which the Google Eclipse
> plugin does not provide.  Does anyone have a suggestion for
> workarounds, or if an ANT build script that duplicates the build
> targets of the Google Eclipse plugin available?
>
> -fazle
>
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Re: [appengine-java] SQL Service

[Matthew Jaggard]

Your quite right, sorry - it's me being stupid. The discussion I was
reading is in a different group...
https://groups.google.com/group/objectify-appengine/browse_thread/thread/1dcf6002c115797a


On 11 October 2011 14:59, Muhammad Ijaz Khan  wrote:
> Yes, but even when I searched my mailbox I didnt find anything :$
>
> On Tue, Oct 11, 2011 at 4:38 PM, Matthew Jaggard 
> wrote:
>>
>> You're not a regular here are you?!
>>
>> On 11 October 2011 14:24, Muhammad Ijaz Khan  wrote:
>> > Any thoughts on this announcement, please share :)
>> >
>> > --
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Re: [appengine-java] SQL Service

[Matthew Jaggard]

You're not a regular here are you?!

On 11 October 2011 14:24, Muhammad Ijaz Khan  wrote:
> Any thoughts on this announcement, please share :)
>
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Re: [appengine-java] Re: Mobile subdomain in app engine

[Matthew Jaggard]

Hi Nischal,
I'm afraid that this won't do what the user wanted - I'm sure he'd
need access to the same datastore and memcache.

Mat.

On 10 October 2011 15:02, Nischal  wrote:
> You don't really need to do anything different in order that a user who
> lands on m.mydomain.com sees a different page. Wherever you have your domain
> hosted, make "m" point to google's name server (I think some ghs.google.com)
> After that, go to your appengine admin and configure this as another domain
> that the app can be accessed from. Whenever a user hits m.mydomain.com you
> would know and display the appropriate page to the user.
>
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