[appengine-java] Re: Checking if I understand transactions correctly
I think you might be a little confused about the difference between
appengine's
transaction in a distributed environment and an enterprise 2-phase
transaction
in a more classic client server architecture?
appengine uses a distributed datastore, so entities are stored all
over the place by default.
In order to ensure that operations on your entities occur with
anything like atomicity all the entities
have to be co-located, that is stored near one another in the
datastore. That means that
they need to be in the same entity group (which means when you make
your keys, they have
to have the same parent = ancestor). The appengine transaction is for
use when your entities
are in the same entity group.
Once you get that correct, you'll see that rollback is executed if the
transaction doesn't finish in the
correct state.
I've been thinking about the banking use case with a distributed
datastore for a little while, and I think that
if appengine were to offer a low-level api for increment or decrement
operations on primitives
that behind the scenes did not use full ORM, but rather operate on the
file in place, that might be helpful...
When we fetch an entity and operate on it, *if* the 'updates' occur
out of order such as can happen during
high frequency updates, we have a total that isn't what's expected.
The work arounds for this
could be several, including [you] designing history entities that
store the timestamp and operation to be performed
and a reference to the entity to be performed on. Then writing a
service that waits a short while then
processes those 'operation entities' will leave your datastore in a
consistent state.
Note that appengine is using similar but more complex logic in its
persistence of entities already, but here you programmatically decide
the time frame for consistency and that timeframe has to be longer
that of the appengine's distributed datastore consistency. That was
a little long winded, but I think if you're going to use this
framework
for bank-type operations then you want to think about how to assure
consistency on timescales for your datastore,
and then on timescales for your client. The solution for client
consistency often uses memcache...
Hope that's helpful.
On May 31, 10:52 pm, Lars Borup Jensen lbor...@gmail.com wrote:
Huh?
As you are only able to do work in a single transactional unit-of-work
on a single entity-group, rollback must be considered usefull.
In the above mentioned snippet, an Account entity is looked-up,
updated and a child entity TransactionRecord is added, all in a single
entity-group, namely the Account's. So a rollback will undo all
operations.
If you had added TransactionRecord to, lets say a TransactionRecords
entity-group, you would have gotten an error if you were operating in
a transactional scope, or no-transaction support at all, hence a
rollback would not have been possible.
Cheers, Lars Borup Jensen
On 1 Jun., 06:21, Didier Durand durand.did...@gmail.com wrote:
Hi,
entity group is not useful at rollback but rather limits you to which
updates you can do: all the entities you touch in a single transaction
must be in the same entity group.
So, designing your groups properly is a key design issue in GAE to
avoid unnecessary complexity when you later need to update at once
entities that you created before in various groups.
regards
didier
On May 30, 7:57 am, Jacob jacob.rho...@gmail.com wrote:
I am writing some code that needs to do a rollback on a secondary
object/table should the transaction fail, I believe this can be done
via entity groups, however I am not sure if this is how it would be
implemented. I have written some sample code to check if what I would
be doing is correct?
Would the following code ensure the Account object is never updated
if the insert of the TransactionRecord object fails.
public void addTransaction(String account, Double value, String
description, Date date) throws EntityNotFoundException {
DatastoreService datastore =
DatastoreServiceFactory.getDatastoreService();
int retries = 3;
while (true) {
Transaction txn = datastore.beginTransaction();
try {
// Update the bank balance
Key key = KeyFactory.createKey(Account,
account);
Entity e = datastore.get(key);
Double balance = (Double)
e.getProperty(balance);
balance += value;
e.setProperty(balance, value);
datastore.put(e);
// Record transaction details
Entity d = new
Entity(TransactionRecord, key);
[appengine-java] can we use Spreadsheet api in GAE Java?
Hi friends...! Am new to Google app engine Am deploying projects in GAE using Java codes But i dont know how to use Spreadsheet api in that Can we use spreadsheet api...? If so please tell me how...? Thanks in advance. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] can we use Spreadsheet api in GAE Java?
Hi Rambo, First update appengine-web.xml by adding system-properties property name=com.google.gdata.DisableCookieHandler value=true/ /system-properties Also refer to the simple steps from Google http://code.google.com/apis/spreadsheets/data/2.0/developers_guide_java.html Thanks George On Thu, Jun 2, 2011 at 1:56 PM, Rambo ramkumarpec...@gmail.com wrote: Hi friends...! Am new to Google app engine Am deploying projects in GAE using Java codes But i dont know how to use Spreadsheet api in that Can we use spreadsheet api...? If so please tell me how...? Thanks in advance. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] the id allocated for a new entity was already in use, please try again.
Hello,
I have the following
Class Party {
@Long id;
KeyTenant tenantKey;
String firstname;
}
Party p = new Party();
KeyTenant tenantKey = new KeyTenant(Tenant.class, mmc);
p.setTenantKey(tenantKey);
// create a Party in empty namespace
KeyParty partyKey = ofy.put(p);
Now, I do the following, just for illustration and to clearly understand
with namespaces.
p = ofy.get(partyKey);
tenantKey = p.getTenantKey();
NamespaceManager.set(tenantKey.getName());
ofy.put(p)
// delete the Party in the empty namespace
NamespaceManager.set();
ofy.delete(p);
Actually, I did the above logic in a mapper for few thousand Parties,
transferring the party entities into its own Namespace.
Now, I start creating Parties in the mmc namespace, I frequently get the
following error
*com.google.appengine.api.datastore.DatastoreFailureException: the id
allocated for a new entity was already in use, please try again*
Regards,
-Aswath
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Re: [appengine-java] Map Reduce
I tried using the mapper with namespace entities. The mapper fails to run and complains com.google.appengine.tools.mapreduce.MapReduceServlet handleCommand: Got exception while running command java.lang.RuntimeException: Got an IOException while trying to make splits Caused by: java.io.IOException: No entities in the datastore query to split. Any ways to configure the mapper for working with all namespaces? -Aswath On Mon, May 16, 2011 at 10:18 PM, Stephen Johnson onepagewo...@gmail.comwrote: I have two questions on the Java version of mapreduce since the docs seem pretty sparse. 1.) Is it possible to use mapreduce over a namespace and if so, how do you configure it? 2.) Is only inputing entity keys and not the entire values supported on the Java version and if so, how do I configure that as well? Thanks, Stephen -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] When to use a String as ID? (using Objectify and GWT)
Hi coders, I have a little quandary here - I'm in the early stages of developing an app that in essence, manages the details of companies. The 'main' objects as it were, are accounts (ie a client of ours - it's a bit like a CRM system) I decided to use the company name as the unique ID, but now this is causing problems for when I want to change the name of the company (this does happen quite a lot). I have been modifying Chris Ramsdale's Contacts MVP tutorial with some success over the last couple of days, but I find that when I try to update a contact by changing the company name or phone number, it simply adds in a new one and leaves the old one there (because the IDs are different the put doesn't overwrite the old one, whereas if they both had the same Long ID they could have different details on the name and phoneNumber fields but still the same unique identifier (@Id)). Now I COULD hack it and pass in the old account name, delete that one and create a new account, but that seems like it's going to cause all manner of problems. Anyone got any suggestions, or am I answering my own question here? Long IDs seem the way to go, but I like the fact that when I use my company name string I don't have to perform a put() before I start adding lists of keys to it, or is this just a minor thing? Thanks -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To view this discussion on the web visit https://groups.google.com/d/msg/google-appengine-java/-/UVJrWjhNODVqdW9K. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Using deferred tasks in Apache Wicket
I have tried using deferred tasks in Apache Wicket. They do indeed run, but I cannot access the bulk of my data exchange code since it needs the context of an application and/or a session to work. I have reverted to using enqueued tasks to fire up a web page and do my processing from there. But I was interested in using DeferredTask since I wanted to: · bypass the 30-second web page response limit and use the 10- minute task processing limit instead · obviate having to code new web pages and just implement the DeferredTask.run() method. Has anyone got to use DeferredTask within the context of an application and session successfully? -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Problem running the Hello World app
My config: Eclipse Version: 3.6.2 / Windows 7 64 Bits I carefully followed all the instructions to install the AppEngine eclipse plug-in and to execute the sample app. However I am getting the following problem. Any help very much appreciated. Cheers Jun 2, 2011 2:03:08 PM java.util.prefs.WindowsPreferences init WARNING: Could not open/create prefs root node Software\JavaSoft\Prefs at root 0x8002. Windows RegCreateKeyEx(...) returned error code 5. java.lang.RuntimeException: Unable to create a DevAppServer at com.google.appengine.tools.development.DevAppServerFactory.createDevAppServer(DevAppServerFactory.java:90) at com.google.appengine.tools.development.DevAppServerFactory.createDevAppServer(DevAppServerFactory.java:38) at com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:154) at com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:48) at com.google.appengine.tools.development.DevAppServerMain.init(DevAppServerMain.java:113) at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java:89) Caused by: java.lang.RuntimeException: java.lang.NoSuchMethodException: sun.net.www.protocol.https.Handler.openConnection(java.net.URL) at com.google.appengine.tools.development.StreamHandlerFactory.getDeclaredMethod(StreamHandlerFactory.java:161) at com.google.appengine.tools.development.LocalURLFetchServiceStreamHandler.init(LocalURLFetchServiceStreamHandler.java:52) at com.google.appengine.tools.development.StreamHandlerFactory.init(StreamHandlerFactory.java:106) at com.google.appengine.tools.development.StreamHandlerFactory.install(StreamHandlerFactory.java:65) at com.google.appengine.tools.development.DevAppServerImpl.init(DevAppServerImpl.java:110) at com.google.appengine.tools.development.DevAppServerImpl.init(DevAppServerImpl.java:85) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:44) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:516) at com.google.appengine.tools.development.DevAppServerFactory.createDevAppServer(DevAppServerFactory.java:84) ... 5 more Caused by: java.lang.NoSuchMethodException: sun.net.www.protocol.https.Handler.openConnection(java.net.URL) at java.lang.Class.throwNoSuchMethodException(Class.java:286) at java.lang.Class.getDeclaredMethod(Class.java:612) at com.google.appengine.tools.development.StreamHandlerFactory.getDeclaredMethod(StreamHandlerFactory.java:157) ... 15 more I believe I have carefully followed all the instructions to configure my AppEngine plugin in Eclipse -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To view this discussion on the web visit https://groups.google.com/d/msg/google-appengine-java/-/X2p4M0V6MV9MeFlK. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] When to use a String as ID? (using Objectify and GWT)
This is the classic synthetic key vs natural key debate, and the general consensus is that synthetic keys are almost always the way to go. For exactly the reasons you describe. Yup, I think you answered your own question :-) Jeff On Thu, Jun 2, 2011 at 4:21 AM, Drew Spencer slugmand...@gmail.com wrote: Hi coders, I have a little quandary here - I'm in the early stages of developing an app that in essence, manages the details of companies. The 'main' objects as it were, are accounts (ie a client of ours - it's a bit like a CRM system) I decided to use the company name as the unique ID, but now this is causing problems for when I want to change the name of the company (this does happen quite a lot). I have been modifying Chris Ramsdale's Contacts MVP tutorial with some success over the last couple of days, but I find that when I try to update a contact by changing the company name or phone number, it simply adds in a new one and leaves the old one there (because the IDs are different the put doesn't overwrite the old one, whereas if they both had the same Long ID they could have different details on the name and phoneNumber fields but still the same unique identifier (@Id)). Now I COULD hack it and pass in the old account name, delete that one and create a new account, but that seems like it's going to cause all manner of problems. Anyone got any suggestions, or am I answering my own question here? Long IDs seem the way to go, but I like the fact that when I use my company name string I don't have to perform a put() before I start adding lists of keys to it, or is this just a minor thing? Thanks -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To view this discussion on the web visit https://groups.google.com/d/msg/google-appengine-java/-/UVJrWjhNODVqdW9K. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Re: Java Backends not working
I dont see anything wrong with your xml file. I was able to deploy my backends here is my code ?xml version=1.0 encoding=UTF-8? backends backend name=mybackend classB2/class instances5/instances options dynamictrue/dynamic publictrue/public /options /backend /backends After you upload you backend do you see your backend listed on the bashboard ? If you dont then something wrong with your upload. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To view this discussion on the web visit https://groups.google.com/d/msg/google-appengine-java/-/cEZzR0pnQmVwa0FK. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] RuntimeException: Couldn't find MR with job ID: ... ??
Hi, Using mapper i am trying to allocate id's to the entities which are already in the name space. And i am using appengine-java-sdk-1.5.0. But when i run the mapper its throwing the exception. And i could not find what is the reason and also unable to stop the mapper ? what is this exception ? Is their any way to debug and find the reason behind this exception ? 1. W2011-06-02 09:09:40.559 /admin/mapreduce/mapperCallback java.lang.RuntimeException: Couldn't find MR with job ID: job_1307030934805_0001 at com.google.appengine.tools.mapreduce.AppEngineJobContext.getConfigurationFromRequest(AppEngineJobContext.java:157) at com.google.appengine.tools.mapreduce.AppEngineJobContext.init(AppEngineJobContext.java:110) at com.google.appengine.tools.mapreduce.MapReduceServlet.handleMapperWorker(MapReduceServlet.java:576) at com.google.appengine.tools.mapreduce.MapReduceServlet.doPost(MapReduceServlet.java:174) at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166) at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:66) at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:118) at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:113) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.veersoft.filter.ResetUserMessagesAndErrorsFilter.doFilter(ResetUserMessagesAndErrorsFilter.java:28) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:97) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388) at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765) at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418) at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:238) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at org.mortbay.jetty.Server.handle(Server.java:326) at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542) at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923) at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76) at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:135) at com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:260) at com.google.apphosting.base.RuntimePb$EvaluationRuntime$2.handleRequest(RuntimePb.java:9669) at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:439) at com.google.net.rpc.impl.Server$RpcTask.runInContext(Server.java:573) at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:448) at com.google.tracing.TraceContext.runInContext(TraceContext.java:688) at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:326) at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:318) at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:446) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:636) 2. C2011-06-02 09:09:40.560 Uncaught exception from servlet java.lang.RuntimeException: Couldn't find MR with job ID: job_1307030934805_0001 at
[appengine-java] newbie question: redirect users (GWT 2.3.0)
Hi experts, I'v build a web application with three entry points so far: registration login start page As you can imagine I want to (or have to) be able to dynamically redirect a user - depending on his authentication/session validation, etc. - to the correct entry point, regardless which URL he choose. Example: user chooses start page.html but is not yet logged in nor does he have a valid session id. So I want to redirect him to login.html automatically. Now the question: what is the best way to redirect a user from one entry point to the next? Is it a simple Window.open() or is it a GWT.setModuleBaseURL(). Second Question: Usually the index.html (or htmls/php/etc) is the first page a webserver is searching for, so people are used to it. Can I somehow map a virtual index.html to my entry point within the app server or should I use a simple header redirect? Thanks a lot! -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To view this discussion on the web visit https://groups.google.com/d/msg/google-appengine-java/-/d3BNUnlOcTlQbzBK. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] GData in Dev mode error, any hint?
Hi everyone: I try to access spreadsheets in my app and get the following error. The app works fine as I deploy it in GAE but always get errors in dev mode. Can anyone helps? I will appreciate a lot. java.lang.NoClassDefFoundError: com/google/gdata/util/ AuthenticationException at java.lang.Class.getDeclaredConstructors0(Native Method) at java.lang.Class.privateGetDeclaredConstructors(Unknown Source) at java.lang.Class.getConstructor0(Unknown Source) at java.lang.Class.newInstance0(Unknown Source) at java.lang.Class.newInstance(Unknown Source) at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153) at org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java: 428) at org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java: 339) at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java: 487) at org.mortbay.jetty.servlet.ServletHandler $CachedChain.doFilter(ServletHandler.java:1166) at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java: 35) at org.mortbay.jetty.servlet.ServletHandler $CachedChain.doFilter(ServletHandler.java:1157) at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java: 58) at org.mortbay.jetty.servlet.ServletHandler $CachedChain.doFilter(ServletHandler.java:1157) at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java: 43) at org.mortbay.jetty.servlet.ServletHandler $CachedChain.doFilter(ServletHandler.java:1157) at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java: 122) at org.mortbay.jetty.servlet.ServletHandler $CachedChain.doFilter(ServletHandler.java:1157) at com.google.appengine.tools.development.BackendServersFilter.doFilter(BackendServersFilter.java: 94) at org.mortbay.jetty.servlet.ServletHandler $CachedChain.doFilter(ServletHandler.java:1157) at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java: 388) at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java: 216) at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java: 182) at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java: 765) at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java: 418) at com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java: 70) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java: 152) at com.google.appengine.tools.development.JettyContainerService $ApiProxyHandler.handle(JettyContainerService.java:351) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java: 152) at org.mortbay.jetty.Server.handle(Server.java:326) at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java: 542) at org.mortbay.jetty.HttpConnection $RequestHandler.content(HttpConnection.java:938) at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755) at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218) at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java: 409) at org.mortbay.thread.QueuedThreadPool $PoolThread.run(QueuedThreadPool.java:582) Caused by: java.lang.ClassNotFoundException: com.google.gdata.util.AuthenticationException at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java: 176) at java.lang.ClassLoader.loadClass(Unknown Source) ... 37 more -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] How to add task to pushQueue and when task will execute
Hi All, I am new to Google App Engine. I was trying to add task to queue. Its adding task to queue but task never gets executed. To add task to queue, i did following steps. 1) created queue.xml as... queue-entries queue namereadwebsitequeue/name rate20/s/rate max-concurrent-requests1/max-concurrent-requests /queue /queue-entries 2) created one servlet by extending HTTPServlet. (URL pattern in web.xml for this servlet is /testtask) inside doGet(),i written following code Queue q = QueueFactory.getQueue(readwebsitequeue); q.add(TaskOptions.Builder.withUrl(/test).param(key, 123)); 3) created one more servlet by extending HTTPServlet (URL pattern in web.xml for this servlet is /task) inside doGet(),i written my business logic say some sending emails. Now, when i execute my first servlet with url /testtask, it is adding task to queue . But when task(i.e test) will execute automatically? I am running it locally. I am able to see tasks in http://localhost:/_ah/admin/taskqueue I am unable to understood document provided by google app engine. Please help me with example. Thanks Ramesh -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Re: Sharing jsession between frontend and backend?
Not sure if this is the best pattern for using the backend to be honest. I would suggest that you don't use the backend for end user web requests. Here are a couple of alternatives: - Trigger the backend process using a task so it is independent of the client web request. Indicate to the end user that the report is being generated. Once the process is complete the backend emails the report to the user. - As before, trigger the backend process using a task so it is independent of the client web request. Forward the user to a page listing reports generated previously with the current report marked as pending. This report list is generated from the datastore. Once the backend process has completed it pushes the report into the blobstore and marks the report entity in the datastore as having been generated. Once the client refreshes the list of reports page they will see that it has been generated and can download it directly from the blobstore as many times as they like. regardz, pdjamez http://www.pdjamez.com On May 31, 3:26 pm, oceandrive rams...@gmail.com wrote: I am looking for the solution on this. Can someone help.. On May 30, 10:18 pm, Tom Phillips tphill0...@gmail.com wrote: I've got a public backend instance that I'd like to share the user session (java sessions are enabled for app) from the frontend with so that the user doesn't have to log in separately on the backend. The intent is that the backend will handle a few reporting pages that are memory intensive on the server, linked to from the frontend. I'm using a custom domain like: myapp.mydomain.com (frontend) mybackend.myapp.mydomain.com (backend) I can sign in to each fine separately, but the session and JSESSIONID cookie apparently aren't shared out of the box with subdomains. It creates a second session and cookie scoped to mybackend.myapp.mydomain.com. Anyone know how to configure things so the main cookie and session are shared with backend subdomains? -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] newbie question: redirect users (GWT 2.3.0)
Most every GWT app has only one entry point not counting the static html in the war file. The three pages you described are commonly set up as separate panels/views that are dynamically placed into a main div within single page load. You may want to read up on using com.google.gwt.user.client.History for tools on how to manipulate browser's history stack. More advanced/complex apps use com.google.gwt.place.shared.Place for mapping url tokens to presenters views. The war/WEB-INF/web.xml file controls the default page being loaded. You can redirect it to whatever although I usually name my entry point index.html. !-- Default page to serve -- welcome-file-list welcome-fileindex.html/welcome-file /welcome-file-list On Thu, Jun 2, 2011 at 10:14 AM, meiaestro jmalbre...@gmx.de wrote: Hi experts, I'v build a web application with three entry points so far: registration login start page As you can imagine I want to (or have to) be able to dynamically redirect a user - depending on his authentication/session validation, etc. - to the correct entry point, regardless which URL he choose. Example: user chooses start page.html but is not yet logged in nor does he have a valid session id. So I want to redirect him to login.html automatically. Now the question: what is the best way to redirect a user from one entry point to the next? Is it a simple Window.open() or is it a GWT.setModuleBaseURL(). Second Question: Usually the index.html (or htmls/php/etc) is the first page a webserver is searching for, so people are used to it. Can I somehow map a virtual index.html to my entry point within the app server or should I use a simple header redirect? Thanks a lot! -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To view this discussion on the web visit https://groups.google.com/d/msg/google-appengine-java/-/d3BNUnlOcTlQbzBK. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- -- A. Stevko === If everything seems under control, you're just not going fast enough. M. Andretti -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Can't create application - SMS says account already verified
Please do a search when you ask a question: https://groups.google.com/forum/#!searchin/google-appengine/SMS$20account$20already$20verified https://groups.google.com/forum/#!searchin/google-appengine/SMS$20account$20already$20verified http://code.google.com/appengine/kb/sms.html http://code.google.com/appengine/kb/sms.htmlThe link you want is here: https://appengine.google.com/waitlist/sms_issues Ikai Lan Developer Programs Engineer, Google App Engine Blog: http://googleappengine.blogspot.com Twitter: http://twitter.com/app_engine Reddit: http://www.reddit.com/r/appengine On Wed, Jun 1, 2011 at 2:24 PM, Joe White white.josep...@gmail.com wrote: I'm trying to create an application but it keeps asking me for my cell phone for SMS verification. When I enter it, it says that it's already been sent too many messages or already verified. What gives? How do I fix this? -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Can't create application - SMS says account already verified
Ikai, thanks for your reply. I already did a search and I did not find the answer to my problem. On other posts, one of the developer there told the person that they fixed it and to try again. I have Verizon in the US and I have received numerous SMS messages before, even a calendar reminder a few minutes ago. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To view this discussion on the web visit https://groups.google.com/d/msg/google-appengine-java/-/cEJFazI4SmVVTkFK. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Re: How to add task to pushQueue and when task will execute
Hi, Did you specifically read http://code.google.com/appengine/docs/java/tools/localunittesting.html#Writing_Task_Queue_Tests for local tests Via the provided sample, you can access the scheduling params of your task regards didier On Jun 2, 2:04 pm, ramesh chiluverirame...@gmail.com wrote: Hi All, I am new to Google App Engine. I was trying to add task to queue. Its adding task to queue but task never gets executed. To add task to queue, i did following steps. 1) created queue.xml as... queue-entries queue namereadwebsitequeue/name rate20/s/rate max-concurrent-requests1/max-concurrent-requests /queue /queue-entries 2) created one servlet by extending HTTPServlet. (URL pattern in web.xml for this servlet is /testtask) inside doGet(),i written following code Queue q = QueueFactory.getQueue(readwebsitequeue); q.add(TaskOptions.Builder.withUrl(/test).param(key, 123)); 3) created one more servlet by extending HTTPServlet (URL pattern in web.xml for this servlet is /task) inside doGet(),i written my business logic say some sending emails. Now, when i execute my first servlet with url /testtask, it is adding task to queue . But when task(i.e test) will execute automatically? I am running it locally. I am able to see tasks inhttp://localhost:/_ah/admin/taskqueue I am unable to understood document provided by google app engine. Please help me with example. Thanks Ramesh -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Re: RuntimeException: Couldn't find MR with job ID: ... ??
Hi, Did you check the source code at http://appengine-mapreduce.googlecode.com/svn/trunk/java/src/com/google/appengine/tools/mapreduce/AppEngineJobContext.java the comments at the point where exception is thron may help you understand why you get it regards didier On Jun 2, 7:00 pm, Santosh kumar kopp@gmail.com wrote: Hi, Using mapper i am trying to allocate id's to the entities which are already in the name space. And i am using appengine-java-sdk-1.5.0. But when i run the mapper its throwing the exception. And i could not find what is the reason and also unable to stop the mapper ? what is this exception ? Is their any way to debug and find the reason behind this exception ? 1. W2011-06-02 09:09:40.559 /admin/mapreduce/mapperCallback java.lang.RuntimeException: Couldn't find MR with job ID: job_1307030934805_0001 at com.google.appengine.tools.mapreduce.AppEngineJobContext.getConfigurationFromRequest(AppEngineJobContext.java:157) at com.google.appengine.tools.mapreduce.AppEngineJobContext.init(AppEngineJobContext.java:110) at com.google.appengine.tools.mapreduce.MapReduceServlet.handleMapperWorker(MapReduceServlet.java:576) at com.google.appengine.tools.mapreduce.MapReduceServlet.doPost(MapReduceServlet.java:174) at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166) at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:66) at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:118) at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:113) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.veersoft.filter.ResetUserMessagesAndErrorsFilter.doFilter(ResetUserMessagesAndErrorsFilter.java:28) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:97) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388) at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765) at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418) at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:238) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at org.mortbay.jetty.Server.handle(Server.java:326) at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542) at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923) at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76) at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:135) at com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:260) at com.google.apphosting.base.RuntimePb$EvaluationRuntime$2.handleRequest(RuntimePb.java:9669) at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:439) at com.google.net.rpc.impl.Server$RpcTask.runInContext(Server.java:573) at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:448) at com.google.tracing.TraceContext.runInContext(TraceContext.java:688) at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:326) at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:318) at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:446) at
[appengine-java] Re: newbie question: redirect users (GWT 2.3.0)
Hi, the beauty (or the horror...) of Java apps with GWT is that you can stay alway in the same page: so, you don't need multiple urls with redirects between them by any mean. You can just programmatically decide in the java code of your unique servlet which content you decide to put on the page. In you case, a simple cascade of java ifs would do it: you decide via those what you user will do next and then you give the right content back to gwt call. Other tricks (redirects, etc.) should be reserved to case where you client is less powerful than the gwt architecture regards didier On Jun 2, 7:14 pm, meiaestro jmalbre...@gmx.de wrote: Hi experts, I'v build a web application with three entry points so far: registration login start page As you can imagine I want to (or have to) be able to dynamically redirect a user - depending on his authentication/session validation, etc. - to the correct entry point, regardless which URL he choose. Example: user chooses start page.html but is not yet logged in nor does he have a valid session id. So I want to redirect him to login.html automatically. Now the question: what is the best way to redirect a user from one entry point to the next? Is it a simple Window.open() or is it a GWT.setModuleBaseURL(). Second Question: Usually the index.html (or htmls/php/etc) is the first page a webserver is searching for, so people are used to it. Can I somehow map a virtual index.html to my entry point within the app server or should I use a simple header redirect? Thanks a lot! -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Old bug reappeared? createLoginURL() missing query string
Hi all:
I'm Using GAE 1.5.0 java, reproduct the bug is easy:
protected void doGet( HttpServletRequest req, HttpServletResponse resp )
throws ServletException, IOException
{
UserService userService = UserServiceFactory.getUserService();
if( !userService.isUserLoggedIn() )
{
String loginUrl =
userService.createLoginURL(req.getRequestURI()+?+req.getQueryString())
req.sendRedirect(req);
}
}
so you will found that after user login and redirect back, the query string
is missing(in fact, only the first query string is remembered):
e.g.
request URL:
http://example.appspot.com/uri?q1=aq2=bq3=c
after user login it redirect to this url:
http://example.appspot.com/uri?q1=a
q2=bq3=c is missing!
i search the forum and found about there are some thread about his, bug the
bug has been fixed long time ago:
one of them:
https://groups.google.com/forum/?pli=1#!searchin/google-appengine-java/createloginurl$20$20$20query/google-appengine-java/ZF4RjIm9NW4/FsMXEzqZbpUJ
the local devmode is all OK, but after deployed error occurs. and i didn't
have any filters in my web.xml
Could someone help me with it? thanks a lot.
--
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