1.is it maximum can only have one list property inside an entity. In
Brett Slatkin talk's merge join. the animal.class example only has one
list property 'has' field . What impact if we use multiple list
property?
2.regarding relation indexes, if my entity need to use multiple list
property.
a)
if i'm not wrong. u can upload as different version of the app. and
different version of app using same datastore.
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in my log, i have this
/j_spring_openid_security_check 6653cpu ms 73api cpu ms
the request use high amount of cpu and may soon exceed it quota
any way to optimize this?
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Hi,
I rewatched google talk 2008, and found this library for datastore
tapioca, may i know is this project still active. Is google planning
to integrate this with appengine sdk any sooner ? how soon will we
able to see feature like distributed transaction support ? please
advice. thank you
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how about, if i denormalized everything . Mean book as id of
subcategory. One entitygroup will only has one entity. any impact on
that if i have too many separate entitygroups...? is this good
practice in bigtable? if i do aware if i do this way, not be able to
use transactional.
can you elabora
if have i have pojo like categoryA -> subcategoryA--> book
relationship.
subcategoryA is child of parent categoryA. book is child of
subcategoryA
in this case, everything is inside same entitygroup
if i need to move 'book' to another subcategory-B. i need to delete
subcategoryA and categoryA, and
i able to get byte[] from blobstore. how to pass these byte[] to
randomacessfile, so that i can seek and read ? can provide some
pseudo code?
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1.i have byte[] array that get from blobstore. I want to input the
byte [] into new File("") but appengine prevent from using
OutputStream/FileOutputStream. what is the workaround to write byte
into new File[] ? this new File[] is only required to be read , no
need to write into filesystem
2.
hi, i follow tutorial sample code at
http://code.google.com/appengine/docs/java/blobstore/overview.html
, but when i try upload file , i get
HTTP ERROR 404
Problem accessing /upload. Reason:
NOT_FOUND
Powered by Jetty://
my web.xml
http://java.sun.com/dtd/web-app_2_3.dtd";>
http://ww
hi, i follow tutorial sample code at
http://code.google.com/appengine/docs/java/blobstore/overview.html
, but when i try upload file , i get
HTTP ERROR 404
Problem accessing /upload. Reason:
NOT_FOUND
Powered by Jetty://
my web.xml
http://java.sun.com/dtd/web-app_2_3.dtd";>
http://ww
hello @Ikai, is it required to use mapreduce . why not get the byte
stream from blockstore and create new file(..) ? there is no limit on
new file(..) and byte[] array in gae right?
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may i know how to use java.io.RandomAccessFile to read big file from
BlockStore ?
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@Ikai , thank you for responding. I noticed your blog before posting
here. one question, which will faster performance, put the binary in
blockstore and read with new File(..) or use import csv into datastore
like what you did ?
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@Ikai , thank you for responding. I noticed your blog before posting
here. one question, which will faster performance, put the binary in
blockstore and read with new File(..) or use import csv into datastore
like what you did ?
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may i know in gae, how to you set parameter for new
LookupService(String databaseFile) ? do you use blockstore ? what is
the path do you upload the maxmind dat file?
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may i know in gae, how to you set parameter for new
LookupService(String databaseFile) ? do you use blockstore ? what is
the path do you upload the maxmind dat file?
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may i know in gae, how to you set parameter for new
LookupService(String databaseFile) ? do you use blockstore ? what is
the path do you upload the maxmind dat file?
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may i know what is the preferable way of using maxmind geoip? upload
the 'binary file' or bulk upload the csv files into bigtable? the
prior technique will slow down application startup time?
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just ask Oracle to fire all their lawyers and hire 'better
programmers' like google if they are serious about innovation. ask
them make better web, no war. for them everything is just $$$, no
wonder they have xtra to spend on lawsuit
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i did my research and found that requirement to write entity(table) in
denormalized form. In this case, one entity(table) will not be related
to another entity(table) [no join] .
1. Is there any limit of number of entity group we can create?
2. what is the 'write speed per second' if i do it this
may i know how portability is gae application. let say i have an
application that using comet feature, task queue..etc and not using
bigtable and i want to deploy on vmware/amazon will it run?
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i saw the roadmap for the possibility to use sql directly on GAE. in
that case, i curious to know what is the scability of using sql? there
will be limitation compared to using gae bigtable right?
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I created an issue
http://code.google.com/p/googleappengine/issues/detail?id=3208&q=mycomponent&colspec=ID%20Type%20Status%20Priority%20Stars%20Owner%20Summary%20Log%20Component
can anyone confirm is this a bug ?
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JID jid = new JID("ad...@host.domain.com"); //success with code
SUCCESS
JID jid = new JID("mycomponent.host.domain.com"); //send fail with
code INVALID_ID,but when i try send from gmail OR jabber to
mycomponent.host.domain.com . it was a success.
Is this a but in google xmpp api?
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currently i create xmppservlet like below
public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
JID jid = new JID("u...@jabber.org");
Message msg = new MessageBuilder()
.withRecipientJi
nice !
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hi, when i connect to gtalk, i able to talk with my bot in appspot.
but when i login to jabber.org, i unable to talk with my bot? anything
i need to configure?
testetefsdf @ appspot.com
p/s: the bot exist in my jabber.org roster and appear online thou
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jgae is getting better and better. thumb up !
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google-appen
any recommendation on scalable bosh server hosting that i can use with
jgae?
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have anyone success in running strophe on rhino ontop of GAE and use
strophe to connect to external BOSH? Will that be possible?
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may i know does by setting javax.servlet.jsp.jstl.fmt.timeZone makes the logs
to show timezone we want? or that parameter is only used for jsp-jstl ?
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I read app engine wiki, on datastore contention if too frequent write
more than 5 times in 1 seconds. The wiki introduced use "shard"
approach" as workaround. May i know if we use spring @transactional
on this, this can prevent datastore contention timeout right since
writing in done concurrently
i will try. The reason socialwork suggested to use code snippet above
is because bigtable doesnt support join. by using this technique they
claim overhead will be smaller.
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sure. the link is
http://groups.google.com/group/google-appengine-java/browse_thread/thread/b9e6a61357c4445d
Ikai, can give any tips what roadmap JGAE plan to improve on
datastore? is that no way in the future to do "join table" ? and have
to use this technique?
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DatastoreService dataSvc =...;
Query query = new Query("MessageRecipients")
.addFilter("recipients"), FilterOperator.EQUAL,userid)
.addSort("date", SortDirection.DESCENDING)
.setKeysOnly(); // <-- Only fetch keys!
//*** from the presentation , mentioned the above can only be done
using
is this problem caused by gae bug? or application bug? found solution
yet?
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i faced same problem. have u found out what is the reason?
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g
i only enhance my model classes (pojo) , but i get warning like
below . Is class "dao, service" need to be included for data nucleus
enhancer?
[testetefsdf/2.339300673130228559].: 13:20:36,874 DEBUG
[DataNucleus.MetaData] - Class
"com.user.testing.service.TestingImplDao" has annotations but the
I already tried all posibilities, if i commented out from .xml i
able to run without error in hosted mode and production
Please comment here
http://stackoverflow.com/questions/2093913/google-app-engine-compass-caused-entitymanagerfactory-error
is compass bean caused the problem?
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i able to run without any error on hosted mode, but when i run on
production (uploaded)
i get error below
[testetefsdf/2.339255113445835576].: 14:14:01,205 ERROR
[org.springframework.web.context.ContextLoader] - Context
initialization failed
org.springframework.beans.factory.BeanCreationExceptio
thank you for your response Rusty. I already tried with parameter.
return 0, that is why i retry with simply statement select c from
com.testing.model.Usertest c where c.username = 'test' . the
example in datanucleus website is using pm. while i'm using jpa
entitymanager.
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may i know is this correct jpa query?
Query query = entityManager.createQuery("select c from
com.testing.model.Usertest c where c.username = 'test' ");
after i did query.getResultList(). It's zero. Please point out where
i did wrong
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my i know is it correct, for each @transaction, i should only do one
query (persist or load) ? if yes, then i will have to annotation
@tranaction at the dao layer rather than method in service layer
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I did the below testing
Map map = new HashMap();
map.put("username", "abc");
List result = service.search("select c from
com.company.testing.model.Usertest c where c.username = :username",
map) ;
System.out.println(""+result.size()); //return 0 ; cannot
search by field?
Map map = ne
are u using jpa ? if yes, are you annotating your jpa entity with
cache?
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any example on using level1/2 caching with jpa @Cacheable? any guide
on this?
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anyone try generate service/dao layer using appfuse for GAE? any
success? anything to hightlight on this?
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also, why use transactions-optional ? optional means? is there other
parameter we can use?
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org.datanucleus.store.appengine.jpa.DatastorePersistenceProvider
this is the default example came with GAE, are you all using the
same setting? from my understanding
setting datanucleus.NontransactionalRead and
datanucleus.No
@Rusty,
can you explain any specify reason why you tweak it for bigtable?
can elaborate?
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1.normally on spring, we will use @transactional at service layer for
concurency control, if we use google guice, is there similar
annotation and does it suported in GAE?
2. is google guice all classes supported in GAE? i about to start look
at google guice, as i find some of the classes in spring
any update on this? can rc3 run on gae?
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my properties->google-->orm-> already put /src but i still get the
below error
i'm using jdk1.6 gae1.2.6. what did i do wrong?
01:38:22,793 ERROR [DataNucleus.MetaData] - Found Meta-Data for class
com.thepackage.class.domain.pojotest but this class is not enhanced!!
Please enhance the class b
its only copy the log to local pc. can it append so that i look like i
use "tail -f" each time got new records in the log?
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wonder is it possible to use any utility to parse the log onto my
local machine console rather than have to view it through gae admin
control panel?
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i already included xercesImpl-2.8.1.jar inside /war/web/web-inf/lib/
but i still get below error when run as web app in eclipse. what did
i miss out?
p/s: i'm using gae1.2.6
WARNING: failed
com.google.apphosting.utils.jetty.devappenginewebappcont...@cf935a{/,/
Users/user/work/project2/gae-jobpor
1.any tool to generate jdo pojo?
2. any impact of using primary key as long and autoincrement it rather
than using jdo 's key ? I do understand that max autoincrement for
sequence is e+27, how about KEY ?
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I looking for feedback from anyone that already tried using JPA+spring
@trans on GAE on any limitation when using the api? can share your
experiences?
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may i know are you generating the domain jdo pojo or handwritten?
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@transactional is supported right? or do i need to use aop-
transactional?
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hi, can anyone comments whether my architecture is ok for using
@transactional with spring on service layer?
http://tinyurl.com/ybmev2b
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anyone tried out apache mina with GAE? any update
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i trying to run openfire on third-party hosting and trying to use GAE
to connect to it so that i able to use feature like component,
pubsub..etc
Which one do you advise to do ?
1. use gae xmpp to send message to my openfire smack client
2. use gae urlfetch to send my message to servlet on my thir
may i know what integration technique that you folks use to implement
external component to an existing XMPP server (e.g. ejabberd or
OpenFire) . Is it through sending xmpp message to another
u...@externaldomain directly or using mechanism like urlfetch?
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how to use java GAE with external jabber server like openfire? any
guide?
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I saw white list http://code.google.com/appengine/docs/java/jrewhitelist.html
, java.lang.Thread is in it. Aren't Thread not supported?
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May i know when GAE mentioned will support XMPP for next version of
GAE, does that mean, it will support "all" features of xmpp? can we
use "BOSH" to replace comet feature? the reason i asking is because
i'm very interested to use comet in my application but found out GAE
doesn't support it. So,
from http://www.nabble.com/DWR3RC1-threads-ts23074328.html#a23227051
, it showed that no working example just yet for dwr3. have anyone
tried on this? why in"will it played" it showed its working?
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may i know what polling technique that you folks use to minimize hit
to servers? i know it's bad ideas. but there is no other way besides
waiting for comet support in app engine
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possible to only utitlieze bigtable for storing data ? may i know is
it possible to connect to certain port on google app engine to query
for database in bigtable? let say i deployed my app in amazon and i
want to use google app engine's bigtable
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since comet not supported, may i know what workaround you folks do to
create live feed ? any such example on gwt?
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may i know if i upload an avi file into app engine, can it be played
by user since there is limit of http duration of 30seconds?
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can flash red5 war run on google app engine? anyone tried on this?
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i able to compile and run the demo, but when i view in the browser, it
just blank . itested on appengine1.22 demo+winxp . anyone else facing
this?
no error in the console
runserver:
[java] Aug 20, 2009 1:27:46 AM
com.google.appengine.tools.development.Isola
tedAppClassLoader checkWorkingDire
i able to compile and run the demo, but when i view in the browser, it
just blank . itested on appengine1.22 demo+winxp . anyone else facing
this?
no error in the console
runserver:
[java] Aug 20, 2009 1:27:46 AM
com.google.appengine.tools.development.Isola
tedAppClassLoader checkWorkingDire
i imported the sticky into eclipse and tried on macox and windowsxp, i
get the same consistent error as below when run as webapp. i'm sure
already included gwt library. anyone know what is the reason of the
error?
Aug 18, 2009 1:19:33 AM com.google.apphosting.utils.jetty.JettyLogger
warn
WARNING
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