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.
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
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
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my web.xml
?xml version=1.0 encoding=UTF-8?
!DOCTYPE web-app
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
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my web.xml
?xml version=1.0 encoding=UTF-8?
!DOCTYPE web-app
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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@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 how to use java.io.RandomAccessFile to read big file from
BlockStore ?
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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 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
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=3208q=mycomponentcolspec=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()
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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any recommendation on scalable bosh server hosting that i can use with
jgae?
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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 ?
may i know does by setting param-
namejavax.servlet.jsp.jstl.fmt.timeZone/param-name makes the logs
to show timezone we want? or that parameter is only used for jsp-jstl ?
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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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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 low
i faced same problem. have u found out what is the reason?
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is this problem caused by gae bug? or application bug? found solution
yet?
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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].stdout: 13:20:36,874 DEBUG
[DataNucleus.MetaData] - Class
com.user.testing.service.TestingImplDao has annotations but
I already tried all posibilities, if i commented out bean
id=compass class=org.compass.spring.LocalCompassBean from .xml i
able to run without error in hosted mode and production
Please comment here
i able to run without any error on hosted mode, but when i run on
production (uploaded)
i get error below
[testetefsdf/2.339255113445835576].stdout: 14:14:01,205 ERROR
[org.springframework.web.context.ContextLoader] - Context
initialization failed
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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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 = new
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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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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persistence-unit name=transactions-optional
providerorg.datanucleus.store.appengine.jpa.DatastorePersistenceProvider/
provider
properties
property name=datanucleus.NontransactionalRead
value=true/
property name=datanucleus.NontransactionalWrite
value=true/
also, why use transactions-optional ? optional means? is there other
parameter we can use?
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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
@Rusty,
can you explain any specify reason why you tweak it for bigtable?
can elaborate?
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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
any update on this? can rc3 run on gae?
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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{/,/
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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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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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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may i know are you generating the domain jdo pojo or handwritten?
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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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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
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, I
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
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 inwill it played it showed its working?
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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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can flash red5 war run on google app engine? anyone tried on this?
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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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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
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