[appengine-java] Re: Problem with exception on server startup when GAE sdk is in svn
Not sure what you mean by make your .svn directories writable. I develop on linux and all the .svn folders have rwx for the user under which I develop. The development server runs as the same user. Should I make the adjustments for group and others? What about the subfolders inside the .svn folder? Should I mess with them too? This is the exception I get: Exception in thread main java.lang.ExceptionInInitializerError at com.google.appengine.tools.util.Logging.initializeLogging(Logging.java:35) at com.google.appengine.tools.development.gwt.AppEngineLauncher.start(AppEngineLauncher.java:77) 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) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120) Caused by: java.lang.NullPointerException at com.google.appengine.tools.info.SdkInfo.getLibs(SdkInfo.java:77) at com.google.appengine.tools.info.SdkInfo.determineOptionalLibs(SdkInfo.java:284) at com.google.appengine.tools.info.SdkInfo.determineOptionalUserLibs(SdkInfo.java:254) at com.google.appengine.tools.info.SdkInfo.init(SdkInfo.java:233) at com.google.appengine.tools.info.SdkInfo.getSdkRoot(SdkInfo.java:182) at com.google.appengine.tools.info.SdkImplInfo.clinit(SdkImplInfo.java:19) ... 11 more I think this is the relevant issue on the issue tracker: http://code.google.com/p/googleappengine/issues/detail?id=6936 This is still an issue in 1.6.3. Please fix this ASAP. On Thursday, February 23, 2012 3:06:32 AM UTC+1, Max Ross (Google) wrote: It's a bug triggered by the fact that the .svn directories are read-only. If you make those directories writable the problem *should* go away. Please try that out and let me know. Thanks, Max -- 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/-/TzYeqGszpiMJ. 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: Problem with exception on server startup when GAE sdk is in svn
Thanks Rick for the valuable information. I do not like the idea of mixing jars from different versions just for svn's sake. For now I'll remove GAE SDK from svn and handle things manually which is a real pain. Hope they fix this issue soon. On Thursday, March 1, 2012 3:25:39 PM UTC+1, Rick Mangi wrote: Dilbert, see my reply on the ticket. Max - that comment about svn being writable is nonsense. I wish you guys would talk to your own support engineers. I tried that solution with my premier support contact and it doesn't even make sense. svn directories are always writable. This is a bug, it's reproducible and it's going to be fixed in 1.6.4 (supposedly). The workaround is posted in my comment on the ticket. It took me weeks of back and forth to get the google engineers to see the problem. If someone had just tried it out I'm sure they would have seen the problem right away. On Thursday, February 2, 2012 4:05:43 AM UTC-5, dilbert wrote: We keep the GAE sdk (together with the project) in svn. Yesterday we upgraded to GAE sdk 1.6.2. It worked fine until we checked it into the svn repo. After that when the server is started it dies with the following message: Exception in thread main java.lang.ExceptionInInitializerError at com.google.appengine.tools.util.Logging.initializeLogging(Lo gging.java:35) at com.google.appengine.tools.development.gwt.AppEngineLauncher .start(AppEngineLauncher.java:77) 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) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAcce ssorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMe thodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.intellij.rt.execution.application.AppMain.main(AppMain.j ava:120) Caused by: java.lang.NullPointerException at com.google.appengine.tools.info.SdkInfo.getLibs(SdkInfo.java :77) at com.google.appengine.tools.info.SdkInfo.determineOptionalLib s(SdkInfo.java:284) at com.google.appengine.tools.info.SdkInfo.determineOptionalUse rLibs(SdkInfo.java:254) at com.google.appengine.tools.info.SdkInfo.init(SdkInfo.java:233) at com.google.appengine.tools.info.SdkInfo.getSdkRoot(SdkInfo.j ava:182) at com.google.appengine.tools.info.SdkImplInfo.clinit(SdkImpl Info.java:19) ... 11 more We keep the sdk in svn since version 1.3.1 and this has never happened before. Any ideas on why this is happening? Any solution? 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/-/0ZZxdfFmAQAJ. 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] com.google.appengine.api.datastore.Key serialization issues
I use an application on a non-GAE server to backup some data (via a Hessian-service implemented on GAE) from my APP engine application datastore. The data is loaded from the datastore as objects which are then serialized by Hessian and sent to the non-GAE service. The data is then stored in an object database. The data is restored (read from the local objecd database sent to the GAE application and stored to the datastore) the storing step fails with the message: java.lang.NullPointerException at com.google.appengine.api.datastore.KeyTranslator.convertToPb(KeyTranslator.java:55) at com.google.appengine.api.datastore.EntityTranslator.convertToPb(EntityTranslator.java:34) at com.google.appengine.api.datastore.AsyncDatastoreServiceImpl.put(AsyncDatastoreServiceImpl.java:429) at com.googlecode.objectify.impl.AsyncObjectifyImpl.put(AsyncObjectifyImpl.java:255) I analized the decompiled Key code and came to the conclusion that the problem lies in the fact that the appId private variable is not properly retrieved from the server when the Key instance is serialized by Hessian. In fact the appId variable is only set upon Java serialization (the writeObject method). So I need to rely on a side effect of the serialization procedure to properly send the Key instance to and from the GAE Application. Another issue is that Java serialization of Key relies on a static object being previously initialized. For example you cannot write this: Key key = KeyFactory.createKey(banana, (5L)); in a non-GAE application if you have not initialized a LocalServiceTestHelper instance. It dies in the following manner: java.lang.NullPointerException: No API environment is registered for this thread. at com.google.appengine.api.datastore.DatastoreApiHelper.getCurrentAppId(DatastoreApiHelper.java:108) at com.google.appengine.api.datastore.DatastoreApiHelper.getCurrentAppIdNamespace(DatastoreApiHelper.java:118) at com.google.appengine.api.datastore.Key.init(Key.java:51) at com.google.appengine.api.datastore.Key.init(Key.java:37) at com.google.appengine.api.datastore.KeyFactory.createKey(KeyFactory.java:46) at com.google.appengine.api.datastore.KeyFactory.createKey(KeyFactory.java:31) This serialization issue is significant on Android applications that use classes containing Key instances which are shared between Activities since the transfer of objects between Activities uses Java Serialization. In my opinion Key should be refactored so the serialization is made less painful. I filed an issue here: http://code.google.com/p/googleappengine/issues/detail?id=4966 Best regards -- 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] Source Code?
Just to clarify. Are You talking about the code for the development server or the real thing? -- 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] Source Code?
OK. Thanks for the info. -- 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] GAE implementation of java.util.concurrent....
I see that the java.util.concurrent... classes are on the whitelist ( http://code.google.com/intl/hr/appengine/docs/java/jrewhitelist.html). Are they implemented properly or as empty (do nothing) implementations. With the new *Concurrent Requests* feature I might need some locking classes. Thanks for Your time. -- 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] Re: GAE implementation of java.util.concurrent....
Thanks Don for the quick answer. I was also wandering about the GAE servlet container implementation. If two requests arrive to the same JVM instance will they be processed by the same servlet (object) or will the runtime spawn two servlet objects? This is important because in the first case I need to secure the servlet's member variables. Thank You for your time. -- 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: Are Java static initializers thread safe on GAE ?
Thanks Simon and Didier for the answer. I am aware of the singleton issue. Also I'd like someone from Google to confirm (no offence Simon and Didier) what Simon and Didier are saying because Googlers are the only ones that can see the code :(. -- 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: GAE implementation of java.util.concurrent....
I do not think You are wrong. However, sometimes You do not need
application-wide but instance-wide locking. For example let's assume this:
class SomeClass{
static SomeObject someObject = null;
SomeObject getSomeObject(){
if(someObject == null){
//Long Initialization
someObject = ...;
}
return someObject;
}
}
If the initialization is long it is possible that many threads will enter
the if(someObject == null) block. I'd like to avoid that. After all long
processing can cost me money.
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Re: [appengine-java] Re: GAE implementation of java.util.concurrent....
Thank you Don for sharing valuable information. -- 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] Re: Are Java static initializers thread safe on GAE ?
Toby, thank You very much for Your help. -- 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 JRE Class White List suggestion
It would be useful if developers could see if the whitelist class ( http://code.google.com/intl/hr/appengine/docs/java/jrewhitelist.html) is really implemented or just faked so that we know which we can use and which are only for show. e.g. java.lang.String - implemented java.util.concurrent.ThreadPoolExecutor - fake -- 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.
[google-appengine] Re: Channel API encoding problem
Yes Moishe I found the problem on the dev appserver. I will try to reproduce it on the production servers later and let You know. BTW I reported the issue here: http://code.google.com/p/googleappengine/issues/detail?id=4675 -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
[google-appengine] Channel API encoding problem
When using the Channel API and sending messages with Croatian letters (e.g. message šđžčćŠĐŽČĆ) the message received on the client gets mangled. The message I receive on the client looks like this: message ??. Has anyone had a similar issue. Is there a way to configure the Channel API so I get the proper message on the client side? Thanks for your help. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
Re: [google-appengine] Channel API encoding problem
Not really sure what you mean. I use the following to send the message: https://groups.google.com/forum/?show_docid=074d568de0a59f7a#%21topic/google-appengine/3u2eW0xgLpU ChannelServiceFactory.getChannelService().sendMessage(new ChannelMessage(key, message šđžčćŠĐŽČĆ)); Thanks for the help. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
[google-appengine] Re: Using the Channel API with a desktop app: possible?
You can vote(star) for this issue: http://code.google.com/p/googleappengine/issues/detail?id=4189 It is essentially about a Java client library that you could include in your desktop app. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
[google-appengine] Re: android application communicating with google app engine
You could try with this: http://monkeyboy-code.blogspot.com/2010/07/using-hessian-in-your-android.html and this: http://monkeyboy-code.blogspot.com/2010/07/using-gae-as-backend-for-android.html -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
Re: [google-appengine] Re: Channel API from mobile
There is an issue requesting a Java client Channel API library here: http://code.google.com/p/googleappengine/issues/detail?id=4189 You can star it if you are interested. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
[appengine-java] Re: Chanel API Java Client
AFAIK You cannot use the Channel API from Android unless you write the Java Client library yourself. There is a relevant issue opened here: http://code.google.com/p/googleappengine/issues/detail?id=4189 You can star it if you are interested. It has already 36 votes. On Dec 7, 2:26 pm, Christian Kosmowski ksm...@googlemail.com wrote: Hi! I was wondering if there is a way to use the channels API directly through java. I'd like to use it in Android and i thought it would be a bit heavyweight to use a JavaScript Implementation just for communication with the channels API. -- 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-j...@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: Any idea on channel api without javascript?
Well You could star one of this issues: -for Java http://code.google.com/p/googleappengine/issues/detail?id=4189 -for Flash http://code.google.com/p/googleappengine/issues/detail?id=4182 or You can submit Your own feature request. Cheers, D On Dec 3, 7:40 am, Benjamin yuhui.w...@gmail.com wrote: Hi there, I am currently using GAE as our game's server, we are not using javascript as the frontend, but channel api is quite a useful stuff for us. Is there any way we can use the channel api without javascript? -- 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-j...@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] GWT wrapper for the client side (javascript) Channel API
It would be a nice feature to have in our GWT arsenal so I submitted an issue here: http://code.google.com/p/googleappengine/issues/detail?id=4192 Please star it if You are interested. -- 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-j...@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: GWT wrapper for the client side (javascript) Channel API
Wow. That was fast. Thanks Ikai. On Dec 3, 8:00 pm, Ikai Lan (Google) ikai.l+gro...@google.com wrote: Here's the official code project: http://code.google.com/p/gwt-gae-channel/ It's currently identical (or pretty similar) to the code used in Dance, Dance Robot, but we expect to be updating the project as needed. -- Ikai Lan Developer Programs Engineer, Google App Engine Blogger:http://googleappengine.blogspot.com Reddit:http://www.reddit.com/r/appengine Twitter:http://twitter.com/app_engine On Fri, Dec 3, 2010 at 10:47 AM, Ikai Lan (Google) ikai.l+gro...@google.comikai.l%2bgro...@google.com wrote: In the meantime, you guys can check out what we did in Dance Dance Robot: http://code.google.com/p/dance-dance-robot/ The code uses JSNI to integrate with the Channel API. It's pretty straightfoward (maybe 20 lines of code tops): http://code.google.com/p/dance-dance-robot/source/browse/#svn/trunk/s... -- Ikai Lan Developer Programs Engineer, Google App Engine Blogger:http://googleappengine.blogspot.com Reddit:http://www.reddit.com/r/appengine Twitter:http://twitter.com/app_engine On Fri, Dec 3, 2010 at 10:40 AM, George Moschovitis george.moschovi...@gmail.com wrote: Indeed, would be very useful! -g. On Dec 3, 6:18 pm, Ice13ill andrei.fifi...@gmail.com wrote: Would be very very nice On Dec 3, 11:00 am, dilbert dilbert.elbo...@gmail.com wrote: It would be a nice feature to have in our GWT arsenal so I submitted an issue here: http://code.google.com/p/googleappengine/issues/detail?id=4192 Please star it if You are interested. -- 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-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@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-j...@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.
[google-appengine] Re: Channel API outside browsers
I submitted an issue regarding the Java client library here: http://code.google.com/p/googleappengine/issues/detail?id=4189 so if anyone is interested please star it. On Nov 6, 3:50 pm, Michael m...@mzlab.net wrote: I'd like to have a port of Channel API for ActionScript. If it uses XMPP under the hood, then it should be pretty simple to emulate as there are ready to use XMPP libraries. Maybe Google should release the underlying protocol specification? Currently i'm using polling from my flash app, and it eats around 30% of my CPU quota. On Nov 2, 2:41 pm, Tomas Alaeus tala...@gmail.com wrote: I for one thought directly of games when I heard that the Channel API were coming to AppEngine. However, all discussions and articles only mentions a Javascript client running in a web browser. Will it come ports to other languages as well? Maybe the actual communication is so simple that it is trivial to do oneself (considering that the API is somewhat similar to websockets if I understood it correctly)? Thanks, Tomas -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
[google-appengine] Re: Channel API outside browsers
The Java (or Python) client library could connect to the XMPP layer directly and on the other side provide developers with an interface similar to the interface provided to Javascript users on the browser. This would effectively hide the XMPP and related XML messages Robert is talking about. Of course Google would have to provide such a library as it provides the Channel API Javascript in the browser. Maybe this approach is not implementable but I can not see why because I have so little information about the internal workings of the Channel API system. I was hoping someone from Google could enlighten us and settle once and for all if we could use the Channel API on clients other than browsers. On Nov 4, 5:27 am, Robert Kluin robert.kl...@gmail.com wrote: My understanding is that the Channel API uses XMPP on the back end to 'connect' to Google's internal 'comet servers.' One of the big advantages this approach is that your app's client does not need to know about XMPP, or be able to process the related XML messages. Instead you can use HTPP and JSON; that _potentially_ lets you build a simpler client. Unfortunately, from Peter's comments it sounds like the underlying mechanism is still complex. Robert On Wed, Nov 3, 2010 at 13:19, dilbert dilbert.elbo...@gmail.com wrote: Peter already answered some of the questions in my previous post. It was posted about half a day ago but since it was my first post in this group it got stuck in the approval process. On Nov 3, 8:24 am, dilbert dilbert.elbo...@gmail.com wrote: I think that the Channel API uses XMPP under the hood (as mentioned here:http://www.youtube.com/watch?v=oMXe-xK0BWAatabout 13:20). I do not see why we could not have a Java or Python client library for Channel API. There is some information about it in this thread (http:// groups.google.com/group/google-appengine-java/browse_thread/thread/ d0401a784d4171c8). Posts 9 and 10 are relevant. It would be nice if we could use the Channel API on Android. Maybe an issue (feature request) should be raised. @Peter - are You saying that a Java client library to use with the Channel API would be impractical/impossible to implement. Could You elaborate a bit. On Nov 3, 5:37 am, Robert Kluin robert.kl...@gmail.com wrote: Are the data-exchanges overly complicated? I have used XMPP for an app, I was hoping the channel API would let me simplify. Robert On Wed, Nov 3, 2010 at 00:29, Peter Petrov onest...@gmail.com wrote: Forget about emulating it outside of a browser. Your best bet is using a separate mechanism for sending messages to non-browser clients - for example make a HTTP postback, or send a XMPP message. On Wed, Nov 3, 2010 at 6:20 AM, Robert Kluin robert.kl...@gmail.com wrote: Have you look at the communications at all? I the javascript file is included in the SDK. It is a little heavy, but you could probably use firebug (or chrome/safari dev console) to figure out what is going on. http://code.google.com/p/googleappengine/source/browse/trunk/python/g... Robert On Tue, Nov 2, 2010 at 08:41, Tomas Alaeus tala...@gmail.com wrote: I for one thought directly of games when I heard that the Channel API were coming to AppEngine. However, all discussions and articles only mentions a Javascript client running in a web browser. Will it come ports to other languages as well? Maybe the actual communication is so simple that it is trivial to do oneself (considering that the API is somewhat similar to websockets if I understood it correctly)? Thanks, Tomas -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine
[google-appengine] Re: Channel API outside browsers
I think that the Channel API uses XMPP under the hood (as mentioned here: http://www.youtube.com/watch?v=oMXe-xK0BWA at about 13:20). I do not see why we could not have a Java or Python client library for Channel API. There is some information about it in this thread (http:// groups.google.com/group/google-appengine-java/browse_thread/thread/ d0401a784d4171c8). Posts 9 and 10 are relevant. It would be nice if we could use the Channel API on Android. Maybe an issue (feature request) should be raised. @Peter - are You saying that a Java client library to use with the Channel API would be impractical/impossible to implement. Could You elaborate a bit. On Nov 3, 5:37 am, Robert Kluin robert.kl...@gmail.com wrote: Are the data-exchanges overly complicated? I have used XMPP for an app, I was hoping the channel API would let me simplify. Robert On Wed, Nov 3, 2010 at 00:29, Peter Petrov onest...@gmail.com wrote: Forget about emulating it outside of a browser. Your best bet is using a separate mechanism for sending messages to non-browser clients - for example make a HTTP postback, or send a XMPP message. On Wed, Nov 3, 2010 at 6:20 AM, Robert Kluin robert.kl...@gmail.com wrote: Have you look at the communications at all? I the javascript file is included in the SDK. It is a little heavy, but you could probably use firebug (or chrome/safari dev console) to figure out what is going on. http://code.google.com/p/googleappengine/source/browse/trunk/python/g... Robert On Tue, Nov 2, 2010 at 08:41, Tomas Alaeus tala...@gmail.com wrote: I for one thought directly of games when I heard that the Channel API were coming to AppEngine. However, all discussions and articles only mentions a Javascript client running in a web browser. Will it come ports to other languages as well? Maybe the actual communication is so simple that it is trivial to do oneself (considering that the API is somewhat similar to websockets if I understood it correctly)? Thanks, Tomas -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
[google-appengine] Re: Channel API outside browsers
Peter already answered some of the questions in my previous post. It was posted about half a day ago but since it was my first post in this group it got stuck in the approval process. On Nov 3, 8:24 am, dilbert dilbert.elbo...@gmail.com wrote: I think that the Channel API uses XMPP under the hood (as mentioned here:http://www.youtube.com/watch?v=oMXe-xK0BWAat about 13:20). I do not see why we could not have a Java or Python client library for Channel API. There is some information about it in this thread (http:// groups.google.com/group/google-appengine-java/browse_thread/thread/ d0401a784d4171c8). Posts 9 and 10 are relevant. It would be nice if we could use the Channel API on Android. Maybe an issue (feature request) should be raised. @Peter - are You saying that a Java client library to use with the Channel API would be impractical/impossible to implement. Could You elaborate a bit. On Nov 3, 5:37 am, Robert Kluin robert.kl...@gmail.com wrote: Are the data-exchanges overly complicated? I have used XMPP for an app, I was hoping the channel API would let me simplify. Robert On Wed, Nov 3, 2010 at 00:29, Peter Petrov onest...@gmail.com wrote: Forget about emulating it outside of a browser. Your best bet is using a separate mechanism for sending messages to non-browser clients - for example make a HTTP postback, or send a XMPP message. On Wed, Nov 3, 2010 at 6:20 AM, Robert Kluin robert.kl...@gmail.com wrote: Have you look at the communications at all? I the javascript file is included in the SDK. It is a little heavy, but you could probably use firebug (or chrome/safari dev console) to figure out what is going on. http://code.google.com/p/googleappengine/source/browse/trunk/python/g... Robert On Tue, Nov 2, 2010 at 08:41, Tomas Alaeus tala...@gmail.com wrote: I for one thought directly of games when I heard that the Channel API were coming to AppEngine. However, all discussions and articles only mentions a Javascript client running in a web browser. Will it come ports to other languages as well? Maybe the actual communication is so simple that it is trivial to do oneself (considering that the API is somewhat similar to websockets if I understood it correctly)? Thanks, Tomas -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
[appengine-java] Re: Newly deployed app doesn’t se em always reflected on the server.
It is not about a change of version and it is not just about hitting F5. On Oct 30, 9:59 am, andrew aute...@gmail.com wrote: As mentioned, IF you are changing version number you will need to set latest as default. Check versions page in dashboard. I have seen some slight delays after default is changed for switchover to new version to occur. A minute maybe. Also, on browser, while on your app page, hit Control F5 to force refresh. -- 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-j...@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: Newly deployed app doesn’t se em always reflected on the server.
I have similar issues. Sometimes I have to deploy twice in order for the changes to be visible on the production server. It is really annoying since it takes a lot of time if the project is large. I'm using Idea to deploy so maybe it is an Idea issue. What are You using to deploy? On Oct 29, 2:17 am, nnhobbit nnclou...@gmail.com wrote: Is version number change necessary? If I deploy it with the same version number, shouldn’t the old one simply be replaced? The page is not cached and I’m not behind any proxy. I’m now thinking it’s more likely there’s a zombie process running? On Oct 16, 10:12 am, Benjamin bsaut...@gmail.com wrote: are you changing the version number? You'd need to go to the console and change the version that's being served. Maybe you're caching behind a proxy or viewing a cached version on your end? try loading the url in a browser and hit F5 On Oct 15, 4:21 pm, nnhobbit nnclou...@gmail.com wrote: I deployed an app, in which an URL was originally serving simply a “hello”. Later I changed the content served from that URL to something else and deployed it again. However the new content did not show up and the page still showed the original “hello”. Another (possibly related) issue I'm experiencing is that an URL that was removed from my code remained accessible for about a day or so after the new code was deployed. (The issue could be either from the delayed deployment or some sort of cache?) p.s. everything is working as expected on devel environment. p.s. admin console shows successful deployment. Anyone encountered similar issues? Any suggestions? Thanks -- 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-j...@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: allocateIds performance
I have two classes. The first class contains a reference to the second. One service request might generate several such pairs. So I figured that I can batch store them at the end of the service request. To do that I need to generate ID-s for all the second classes. I thought that allocateIds was what I needed but from the tests I made (it sometimes took much longer to execute than other times) I suspected that it sometimes goes to the datastore. Ideally I would like to avoid going to the datastore just to generate the Id-s. What is the best way to accomplish this? To answer Your second question I haven't had time to play with AppStats yet. I measured time using System.nanoTime(). Thanks for Your time. On Oct 1, 10:59 pm, Ikai Lan (Google) ikai.l+gro...@google.com wrote: They're a function of the datastore itself, but they don't create indexes or any of the things that are usually associated with entity writes. The worst case performance has allocateIds doing a write to a hard disk, but most of the time they retrieve data from in-memory caches. What are you trying to do? Have you benchmarked this using AppStats? -- Ikai Lan Developer Programs Engineer, Google App Engine Blogger:http://googleappengine.blogspot.com Reddit:http://www.reddit.com/r/appengine Twitter:http://twitter.com/app_engine On Tue, Sep 28, 2010 at 4:19 AM, dilbert dilbert.elbo...@gmail.com wrote: How fast are the allocateIds methods from the DatastoreService interface? I mean do they hit the datastore? -- 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-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@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-j...@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] allocateIds performance
How fast are the allocateIds methods from the DatastoreService interface? I mean do they hit the datastore? -- 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-j...@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: What is the best option for RPC (web services) on App engine?
This may be a new shiny valid alternative:
http://googlewebtoolkit.blogspot.com/2010/07/gwtrpccommlayer-extending-gwt-rpc-to-do.html?utm_source=feedburnerutm_medium=feedutm_campaign=Feed:+blogspot/NWLT+(Google+Web+Toolkit+Blog)utm_content=Google+Reader
I wonder if it will work on Android.
On Jun 16, 10:44 am, dilbert dilbert.elbo...@gmail.com wrote:
I posted a new bug report:http://bugs.caucho.com/view.php?id=4080
I would like to move further discussion about this issue to the proper
place:http://groups.google.com/group/google-appengine-java/browse_thread/th...
D.
On Jun 16, 12:12 am, Jeff Schnitzer j...@infohazard.org wrote:
I would close the old issue and create a new one cut down to just the
exception issue.
*Are* there any serious RPC alternatives right now? Sounds like
gwt-syncproxy isn't quite ready for prime time (and makes me nervous
since it's not using a published protocol), the *-WS stuff is a
trainwreck, and *-RS is not really convenient as an RPC layer. I
would like alternatives.
Jeff
On Tue, Jun 15, 2010 at 2:41 PM, dilbert dilbert.elbo...@gmail.com wrote:
At the time I thought the issues were connected since they threw the
same exception so I posted them together. So should I post the issue
with exceptions again on the Caucho bug tracker? If this issue is
solved I would recommend Hessian as the best RPC mechanism for GAE at
this time.
Apologies to other readers for the offtopic with bugs.
D.
On Jun 15, 11:24 pm, Jeff Schnitzer j...@infohazard.org wrote:
I think you did yourself a disservice by wrapping these two issues
into a single message - it ends up being way too much text to read and
otherwise eager volunteers just skip it.
The first issue looks like you're not detaching your entities before
serializing them. This is a JDO issue. I suggest dropping JDO and
using something simpler like Objectify ;-)
The issue with exceptions looks more serious. This is something that
will need to be fixed in Hessian (or your custom serializer). If you
cut down your issue to just this, you might get better results from
Caucho.
Jeff
On Tue, Jun 15, 2010 at 1:55 PM, dilbert dilbert.elbo...@gmail.com
wrote:
Hi Jeff. I was hoping to hear from You since I saw that You solved
some GAE issues on the hessian-interest list. I already posted the
issue on the hessian-interest list here:
http://maillist.caucho.com/pipermail/hessian-interest/2010-June/00090...
I also posted several forum questions:
http://forum.caucho.com/showthread.php?t=
http://groups.google.com/group/google-appengine-java/browse_thread/th...
And a few bug reports:
http://bugs.caucho.com/view.php?id=4061
http://code.google.com/p/googleappengine/issues/detail?id=3305
The posts actually describe two issues one with arraylist
serialization and the other with exception serialization. The posts
also include test projects with code that reproduces the issues. I
also managed to solve the issue today by using a custom serializer.
Here is how. First the Serializer:
public class ThrowableSerializer extends AbstractSerializer {
�...@override
public void writeObject(Object obj, AbstractHessianOutput out)
throws IOException {
if (obj != null) {
final Class cl = obj.getClass();
if (out.addRef(obj))
return;
int ref = out.writeObjectBegin(cl.getName());
Throwable tr = (Throwable) obj;
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(bos);
try {
oos.writeObject(tr);
if (ref -1) {
out.writeString(value);
out.writeBytes(bos.toByteArray());
out.writeMapEnd();
} else {
if (ref == -1) {
out.writeInt(1);
out.writeString(value);
out.writeObjectBegin(cl.getName());
}
out.writeBytes(bos.toByteArray());
}
} finally {
oos.close();
bos.close();
}
} else
out.writeNull();
}
}
The other class we need is the Deserializer:
public class ThrowableDeserializer extends AbstractDeserializer {
//private static final Logger l =
Logger.getLogger(ThrowableDeserializer.class.getName());
�...@override
public Class getType() {
return Throwable.class;
}
�...@override
public Object readMap(AbstractHessianInput in) throws IOException
{
int ref = in.addRef(null);
byte[] initValue = null;
while (!in.isEnd()) {
String
[appengine-java] Re: SecurityException with Hessian on google app engine
I posted a new bug report to the Hessian people:
http://bugs.caucho.com/view.php?id=4080
There is also some information about this bug here:
http://groups.google.com/group/google-appengine-java/browse_thread/thread/ccb9d0ff6b88545/
On Jun 8, 10:31 am, Matija matija.jerko...@gmail.com wrote:
Any news about this SecurityException ?
Matija.
On Jun 5, 4:46 pm, dilbert dilbert.elbo...@gmail.com wrote:
I am having trouble with Hessian on Google App Engine. First I will
describe the setup. I have a persistent class MessageDb declared as
(It contains a String and an arraylist of strings):
@PersistenceCapable
public class MessageDb {
@PrimaryKey
private String user;
@Persistent
private ArrayListString words = new ArrayListString();
/* getters and setters ...*/
}
I have the following service interface:
public interface IService {
ArrayListString testMessage();
/* Some other methods ... */
}
The Service is implemented on App engine in the following way:
public class Service extends HessianServlet implements IService {
private static final PersistenceManagerFactory pmfInstance =
JDOHelper.getPersistenceManagerFactory(transactions-optional);
@Override
public ArrayListString testMessage() {
PersistenceManager pm = null;
try {
pm = pmfInstance.getPersistenceManager();
MessageDb messageDb;
try {
messageDb = pm.getObjectById(MessageDb.class,
testMessage);
} catch (JDOObjectNotFoundException e) {
return null;
}
return messageDb.getWords();
//return new ArrayListString(messageDb.getWords());
} finally {
if (pm != null)
pm.close();
}
}
}
The service simply retrieves an MessageDb object by key and returns
the object's ArrayListString. This code works fine on the local
development server but it fails when deployed on remote Google servers
with the following exception:
java.lang.SecurityException: java.lang.IllegalAccessException:
Reflection is not allowed on private int java.util.ArrayList.size
at
com.google.appengine.runtime.Request.process-0c4ab611241850c6(Request.java)
at java.lang.reflect.Field.setAccessible(Field.java:166)
at
com.caucho.hessian.io.JavaSerializer.introspect(JavaSerializer.java:
122)
at com.caucho.hessian.io.JavaSerializer.init(JavaSerializer.java:
81)
at com.caucho.hessian.io.JavaSerializer.create(JavaSerializer.java:
95)
at
com.caucho.hessian.io.SerializerFactory.getDefaultSerializer(SerializerFact
ory.java:
348)
at
com.caucho.hessian.io.SerializerFactory.loadSerializer(SerializerFactory.ja
va:
278)
at
com.caucho.hessian.io.SerializerFactory.getSerializer(SerializerFactory.jav
a:
224)
at
com.caucho.hessian.io.SerializerFactory.getObjectSerializer(SerializerFacto
ry.java:
197)
at
com.caucho.hessian.io.Hessian2Output.writeObject(Hessian2Output.java:
418)
at
com.caucho.hessian.io.AbstractHessianOutput.writeReply(AbstractHessianOutpu
t.java:
558)
at
com.caucho.hessian.server.HessianSkeleton.invoke(HessianSkeleton.java:
323)
at
com.caucho.hessian.server.HessianSkeleton.invoke(HessianSkeleton.java:
202)
at
com.caucho.hessian.server.HessianServlet.invoke(HessianServlet.java:
389)
at
com.caucho.hessian.server.HessianServlet.service(HessianServlet.java:
369)
at
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
511)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1166)
at
com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlo
bUploadFilter.java:
97)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1157)
at
com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionF
ilter.java:
35)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1157)
at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(Trans
actionCleanupFilter.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
[appengine-java] Re: SecurityException with Hessian on google app engine
I posted a new bug report to the Hessian people:
http://bugs.caucho.com/view.php?id=4080
There is also some information about this bug here:
http://groups.google.com/group/google-appengine-java/browse_thread/thread/ccb9d0ff6b88545/
On Jun 8, 10:31 am, Matija matija.jerko...@gmail.com wrote:
Any news about this SecurityException ?
Matija.
On Jun 5, 4:46 pm, dilbert dilbert.elbo...@gmail.com wrote:
I am having trouble with Hessian on Google App Engine. First I will
describe the setup. I have a persistent class MessageDb declared as
(It contains a String and an arraylist of strings):
@PersistenceCapable
public class MessageDb {
@PrimaryKey
private String user;
@Persistent
private ArrayListString words = new ArrayListString();
/* getters and setters ...*/
}
I have the following service interface:
public interface IService {
ArrayListString testMessage();
/* Some other methods ... */
}
The Service is implemented on App engine in the following way:
public class Service extends HessianServlet implements IService {
private static final PersistenceManagerFactory pmfInstance =
JDOHelper.getPersistenceManagerFactory(transactions-optional);
@Override
public ArrayListString testMessage() {
PersistenceManager pm = null;
try {
pm = pmfInstance.getPersistenceManager();
MessageDb messageDb;
try {
messageDb = pm.getObjectById(MessageDb.class,
testMessage);
} catch (JDOObjectNotFoundException e) {
return null;
}
return messageDb.getWords();
//return new ArrayListString(messageDb.getWords());
} finally {
if (pm != null)
pm.close();
}
}
}
The service simply retrieves an MessageDb object by key and returns
the object's ArrayListString. This code works fine on the local
development server but it fails when deployed on remote Google servers
with the following exception:
java.lang.SecurityException: java.lang.IllegalAccessException:
Reflection is not allowed on private int java.util.ArrayList.size
at
com.google.appengine.runtime.Request.process-0c4ab611241850c6(Request.java)
at java.lang.reflect.Field.setAccessible(Field.java:166)
at
com.caucho.hessian.io.JavaSerializer.introspect(JavaSerializer.java:
122)
at com.caucho.hessian.io.JavaSerializer.init(JavaSerializer.java:
81)
at com.caucho.hessian.io.JavaSerializer.create(JavaSerializer.java:
95)
at
com.caucho.hessian.io.SerializerFactory.getDefaultSerializer(SerializerFact
ory.java:
348)
at
com.caucho.hessian.io.SerializerFactory.loadSerializer(SerializerFactory.ja
va:
278)
at
com.caucho.hessian.io.SerializerFactory.getSerializer(SerializerFactory.jav
a:
224)
at
com.caucho.hessian.io.SerializerFactory.getObjectSerializer(SerializerFacto
ry.java:
197)
at
com.caucho.hessian.io.Hessian2Output.writeObject(Hessian2Output.java:
418)
at
com.caucho.hessian.io.AbstractHessianOutput.writeReply(AbstractHessianOutpu
t.java:
558)
at
com.caucho.hessian.server.HessianSkeleton.invoke(HessianSkeleton.java:
323)
at
com.caucho.hessian.server.HessianSkeleton.invoke(HessianSkeleton.java:
202)
at
com.caucho.hessian.server.HessianServlet.invoke(HessianServlet.java:
389)
at
com.caucho.hessian.server.HessianServlet.service(HessianServlet.java:
369)
at
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
511)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1166)
at
com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlo
bUploadFilter.java:
97)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1157)
at
com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionF
ilter.java:
35)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1157)
at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(Trans
actionCleanupFilter.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
[appengine-java] Re: What is the best option for RPC (web services) on App engine?
I posted a new bug report: http://bugs.caucho.com/view.php?id=4080
I would like to move further discussion about this issue to the proper
place:
http://groups.google.com/group/google-appengine-java/browse_thread/thread/c4fb4f414c425ca1
D.
On Jun 16, 12:12 am, Jeff Schnitzer j...@infohazard.org wrote:
I would close the old issue and create a new one cut down to just the
exception issue.
*Are* there any serious RPC alternatives right now? Sounds like
gwt-syncproxy isn't quite ready for prime time (and makes me nervous
since it's not using a published protocol), the *-WS stuff is a
trainwreck, and *-RS is not really convenient as an RPC layer. I
would like alternatives.
Jeff
On Tue, Jun 15, 2010 at 2:41 PM, dilbert dilbert.elbo...@gmail.com wrote:
At the time I thought the issues were connected since they threw the
same exception so I posted them together. So should I post the issue
with exceptions again on the Caucho bug tracker? If this issue is
solved I would recommend Hessian as the best RPC mechanism for GAE at
this time.
Apologies to other readers for the offtopic with bugs.
D.
On Jun 15, 11:24 pm, Jeff Schnitzer j...@infohazard.org wrote:
I think you did yourself a disservice by wrapping these two issues
into a single message - it ends up being way too much text to read and
otherwise eager volunteers just skip it.
The first issue looks like you're not detaching your entities before
serializing them. This is a JDO issue. I suggest dropping JDO and
using something simpler like Objectify ;-)
The issue with exceptions looks more serious. This is something that
will need to be fixed in Hessian (or your custom serializer). If you
cut down your issue to just this, you might get better results from
Caucho.
Jeff
On Tue, Jun 15, 2010 at 1:55 PM, dilbert dilbert.elbo...@gmail.com wrote:
Hi Jeff. I was hoping to hear from You since I saw that You solved
some GAE issues on the hessian-interest list. I already posted the
issue on the hessian-interest list here:
http://maillist.caucho.com/pipermail/hessian-interest/2010-June/00090...
I also posted several forum questions:
http://forum.caucho.com/showthread.php?t=
http://groups.google.com/group/google-appengine-java/browse_thread/th...
And a few bug reports:
http://bugs.caucho.com/view.php?id=4061
http://code.google.com/p/googleappengine/issues/detail?id=3305
The posts actually describe two issues one with arraylist
serialization and the other with exception serialization. The posts
also include test projects with code that reproduces the issues. I
also managed to solve the issue today by using a custom serializer.
Here is how. First the Serializer:
public class ThrowableSerializer extends AbstractSerializer {
�...@override
public void writeObject(Object obj, AbstractHessianOutput out)
throws IOException {
if (obj != null) {
final Class cl = obj.getClass();
if (out.addRef(obj))
return;
int ref = out.writeObjectBegin(cl.getName());
Throwable tr = (Throwable) obj;
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(bos);
try {
oos.writeObject(tr);
if (ref -1) {
out.writeString(value);
out.writeBytes(bos.toByteArray());
out.writeMapEnd();
} else {
if (ref == -1) {
out.writeInt(1);
out.writeString(value);
out.writeObjectBegin(cl.getName());
}
out.writeBytes(bos.toByteArray());
}
} finally {
oos.close();
bos.close();
}
} else
out.writeNull();
}
}
The other class we need is the Deserializer:
public class ThrowableDeserializer extends AbstractDeserializer {
//private static final Logger l =
Logger.getLogger(ThrowableDeserializer.class.getName());
�...@override
public Class getType() {
return Throwable.class;
}
�...@override
public Object readMap(AbstractHessianInput in) throws IOException
{
int ref = in.addRef(null);
byte[] initValue = null;
while (!in.isEnd()) {
String key = in.readString();
if (key.equals(value))
initValue = in.readBytes();
else
in.readString();
}
in.readMapEnd();
ByteArrayInputStream bis = new
ByteArrayInputStream(initValue);
ObjectInputStream ois = new ObjectInputStream(bis);
try {
Object value = ois.readObject();
in.setRef(ref, value
[appengine-java] Re: What is the best option for RPC (web services) on App engine?
At the time I thought the issues were connected since they threw the
same exception so I posted them together. So should I post the issue
with exceptions again on the Caucho bug tracker? If this issue is
solved I would recommend Hessian as the best RPC mechanism for GAE at
this time.
Apologies to other readers for the offtopic with bugs.
D.
On Jun 15, 11:24 pm, Jeff Schnitzer j...@infohazard.org wrote:
I think you did yourself a disservice by wrapping these two issues
into a single message - it ends up being way too much text to read and
otherwise eager volunteers just skip it.
The first issue looks like you're not detaching your entities before
serializing them. This is a JDO issue. I suggest dropping JDO and
using something simpler like Objectify ;-)
The issue with exceptions looks more serious. This is something that
will need to be fixed in Hessian (or your custom serializer). If you
cut down your issue to just this, you might get better results from
Caucho.
Jeff
On Tue, Jun 15, 2010 at 1:55 PM, dilbert dilbert.elbo...@gmail.com wrote:
Hi Jeff. I was hoping to hear from You since I saw that You solved
some GAE issues on the hessian-interest list. I already posted the
issue on the hessian-interest list here:
http://maillist.caucho.com/pipermail/hessian-interest/2010-June/00090...
I also posted several forum questions:
http://forum.caucho.com/showthread.php?t=
http://groups.google.com/group/google-appengine-java/browse_thread/th...
And a few bug reports:
http://bugs.caucho.com/view.php?id=4061
http://code.google.com/p/googleappengine/issues/detail?id=3305
The posts actually describe two issues one with arraylist
serialization and the other with exception serialization. The posts
also include test projects with code that reproduces the issues. I
also managed to solve the issue today by using a custom serializer.
Here is how. First the Serializer:
public class ThrowableSerializer extends AbstractSerializer {
�...@override
public void writeObject(Object obj, AbstractHessianOutput out)
throws IOException {
if (obj != null) {
final Class cl = obj.getClass();
if (out.addRef(obj))
return;
int ref = out.writeObjectBegin(cl.getName());
Throwable tr = (Throwable) obj;
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(bos);
try {
oos.writeObject(tr);
if (ref -1) {
out.writeString(value);
out.writeBytes(bos.toByteArray());
out.writeMapEnd();
} else {
if (ref == -1) {
out.writeInt(1);
out.writeString(value);
out.writeObjectBegin(cl.getName());
}
out.writeBytes(bos.toByteArray());
}
} finally {
oos.close();
bos.close();
}
} else
out.writeNull();
}
}
The other class we need is the Deserializer:
public class ThrowableDeserializer extends AbstractDeserializer {
//private static final Logger l =
Logger.getLogger(ThrowableDeserializer.class.getName());
�...@override
public Class getType() {
return Throwable.class;
}
�...@override
public Object readMap(AbstractHessianInput in) throws IOException
{
int ref = in.addRef(null);
byte[] initValue = null;
while (!in.isEnd()) {
String key = in.readString();
if (key.equals(value))
initValue = in.readBytes();
else
in.readString();
}
in.readMapEnd();
ByteArrayInputStream bis = new
ByteArrayInputStream(initValue);
ObjectInputStream ois = new ObjectInputStream(bis);
try {
Object value = ois.readObject();
in.setRef(ref, value);
return value;
} catch (ClassNotFoundException e) {
throw new RuntimeException(e);
} finally {
ois.close();
bis.close();
}
}
�...@override
public Object readObject(AbstractHessianInput in, Object[]
fieldNames)
throws IOException {
int ref = in.addRef(null);
byte[] initValue = null;
for (Object o : fieldNames) {
if (o instanceof String) {
final String key = (String) o;
if (key.equals(value))
initValue = in.readBytes();
else
in.readObject();
}
}
ByteArrayInputStream bis = new
ByteArrayInputStream(initValue);
ObjectInputStream ois = new ObjectInputStream(bis);
try
[appengine-java] What is the best option for RPC (web services) on App engine?
First I'd like to explain what I mean by RPC. I'd like to be able to
write interfaces like this (simple Java interface):
public interface EchoService {
String echo(String message);
}
The framework would allow the creation of client classes that would
handle the serialization from/to the RPC service. Of course the
framework should support the serialization of ArrayLists, HashMaps and
other collections and should also support the serialization of objects
marked with the java.io.Serializable interface (or some other
interface).
We would create the RPC Client this way:
EchoService echoService =
RpcClientFactory.createInstance(EchoService.class,http://bla.com/
smartApp/echo);
And of course use it this way:
String echoMessage = echoService.echo(The message !!!);
The server side servlet would implement the previously mentioned
interface.
public class Service extends WhateverServlet implements EchoService {
@Override
String echo(String message) {
return server sends: + message;
}
}
A few additional nice features to have would be:
-support for asynchronous calls (where the developer would provide a
callback for handling the result, similar to GWT RPC)
-the developers should be able to access the RPC client somehow to be
able to handle Cookies or other http headers.
-the client side should be usable from Android.
After a long search I have found that the framework that most closely
matches these requirements is Hessian (http://hessian.caucho.com/). It
uses a binary protocol so it should be very fast and it works on
Android. AFAIK it does not support async calls. However, not all is
well. The current Hessian implementation does not handle exceptions
well. It throws a SecurityException like this:
java.lang.SecurityException: java.lang.IllegalAccessException:
Reflection is not allowed on private java.lang.Throwable
java.lang.Throwable.cause
I considered GWT RPC for a while but it does not have a proper Java
client or I could not find one. So I wanted to ask is there any other
library that could be used in this case? Could the App engine team
write such a library and add it to the SDK. Any suggestions?
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