[appengine-java] Help:I can't make a object persistent completely.
This is the object:
___
@PersistenceCapable(identityType = IdentityType.APPLICATION,
detachable = true)
public class Client implements java.io.Serializable {
@Persistent
private ArrayListOneService serviceRecords;
@Persistent
private ArrayListOneService serviceNow;
@Persistent
private String remarks;
..
public ArrayListOneService getServiceRecords() {
return serviceRecords;
}
public void setServiceRecords(ArrayListOneService serviceRecords) {
this.serviceRecords.clear();
for (int i = 0; i serviceRecords.size(); i++) {
this.serviceRecords.add(serviceRecords.get(i));
}
}
public ArrayListOneService getServiceNow() {
return serviceNow;
}
public void setServiceNow(ArrayListOneService serviceNow) {
this.serviceNow.clear();
for (int i = 0; i serviceRecords.size(); i++) {
this.serviceNow.add(serviceNow.get(i));
when i try to make this kind of Object pesistent like this:
___
ArrayListOneService serviceNow = new ArrayListOneService();
serviceNow.add(oneservice);
client.setServiceNow(serviceNow);
___
the ArrayList serviceNow in the Object doesn't contains another
object oneservice i want to add into the ArrayListserviceNow.
p.s. my english is bad and if it makes u confused because of my poor
expression,i beg your pardon.
--
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=.
[appengine-java] Re: Is there a recommended way to differentiate between production and dev GAE environments?
Follow that thread: http://groups.google.co.uk/group/google-appengine-java/browse_frm/thread/8145f547cbaff99e/453847dda0217e71?q=#453847dda0217e71 -- 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=.
[appengine-java] Re: Local server works, Appspot fails with java.lang.StackOverflowError when Spring AOP is enabled
I'm also experiencing Gabriel's topmost stacktrace while attempting to POC Drools. Like Kris, I cannot see far enough into the stacktrace to determine what drools API call is triggering the behavior. My app is heroict...@appspot.com. On Nov 4, 3:43 am, Kris krisajenk...@gmail.com wrote: Hi Toby, I've just realised that I probably over-wrote the app with a new version yesterday. Did you get what you need? (If not, I can easily re-deploy and resend the ID.) Cheers, Kris On Oct 19, 8:30 pm, Toby Reyelts to...@google.com wrote: Kris, Can you send us your app id (privately if you wish) ? On Mon, Oct 19, 2009 at 3:57 PM, Kris krisajenk...@gmail.com wrote: I'm also getting this StackOverflowError, but the app engine log view is truncated, so I can't see the initial cause. Is there any way to see the whole log message, so I can try to help track it down/produce a test case? Cheers, Kris On Oct 7, 4:36 pm, Toby Reyelts to...@google.com wrote: Unfortunately this is an issue that will be very difficult for us to solve unless you can provide us with a simple reproducing app that we can use to debug. If the issue is important to you, that is the most important thing you can do to help us.On Wed, Oct 7, 2009 at 6:57 AM, Dave Cheong d...@davecheong.com wrote: Hi there, I'm having the same problem and was wondering if you or anyone else out there have found a solution. I'm currently using GAE/J 1.2.5 and Spring 2.5. Like the previous author, everything works locally but I get a StackOverflowError on Appspot. However, if I comment out ... aop:aspectj-autoproxy/ ... things work on Appspot. Any help provided is much appreciated. thanks, dave On Aug 26, 3:38 pm, Gabriel Moreira gabrielmore...@gmail.com wrote: My app is using Spring 3.0. If i disable Spring AOP, my app runs fine both on local and appspot. But when i enable Spring AOP (tested with advice or aspects), in local runtime everything is fine and works, but in appspot im getting this error: java.lang.StackOverflowError at java.lang.String.endsWith(Unknown Source) at sun.security.provider.PolicyFile.canonPath(Unknown Source) at java.io.FilePermission$1.run(Unknown Source) at java.io.FilePermission$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.io.FilePermission.init(Unknown Source) at java.io.FilePermission.init(Unknown Source) at sun.net.www.protocol.file.FileURLConnection.getPermission(Unknown Source) at sun.misc.URLClassPath.check(Unknown Source) at sun.misc.URLClassPath$FileLoader.getResource(Unknown Source) at sun.misc.URLClassPath$FileLoader.findResource(Unknown Source) at sun.misc.URLClassPath.findResource(Unknown Source) at java.net.URLClassLoader$2.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findResource(Unknown Source) at com.google.apphosting.runtime.security.UserClassLoader.findResource (UserClassLoader.java:631) at java.lang.ClassLoader.getResource(Unknown Source) at com.google.apphosting.runtime.security.UserClassLoader$4.run (UserClassLoader.java:665) at com.google.apphosting.runtime.security.UserClassLoader$4.run (UserClassLoader.java:659) at java.security.AccessController.doPrivileged(Native Method) at com.google.apphosting.runtime.security.UserClassLoader.findResource (UserClassLoader.java:659) at java.lang.ClassLoader.getResource(Unknown Source) at com.google.apphosting.runtime.security.UserClassLoader$4.run (UserClassLoader.java:665) at com.google.apphosting.runtime.security.UserClassLoader$4.run (UserClassLoader.java:659) at java.security.AccessController.doPrivileged(Native Method) at com.google.apphosting.runtime.security.UserClassLoader.findResource (UserClassLoader.java:659) at java.lang.ClassLoader.getResource(Unknown Source) at com.google.apphosting.runtime.security.UserClassLoader$4.run (UserClassLoader.java:665) at com.google.apphosting.runtime.security.UserClassLoader$4.run (UserClassLoader.java:659) at java.security.AccessController.doPrivileged(Native Method) at com.google.apphosting.runtime.security.UserClassLoader.findResour... My applicationContext.xml: ?xml version=1.0 encoding=UTF-8? beans xmlns=http://www.springframework.org/schema/beans;
[appengine-java] Re: problem with using session.getAttribute()
Did you solve this problem? I am facing exactly same problem, it would be nice if you could share the solution if you found one. Thank you -- 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=.
Re: [appengine-java] A web service with security (java)
Hi Andrey, I don't know the exact answer, but I am just curious whether this is feasible or easy to do, using a third party library, because we have to make sure that all the classes that the third party lib uses are on the white list of Google, also we how is the authentication user information stored? Maybe we need to develop an app just for authentication? then if a user is authorized, they will be redirected to some other urls. Yiming On Thu, Nov 19, 2009 at 5:53 AM, Andrey andrey.si...@gmail.com wrote: Hello, What java lib or project would you recommend for development a web service with security (to give the users the data only according there role or userName). Thanks, -Andrey -- 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=. -- 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=.
[appengine-java] Discussion on will-it-play-in-app-engine
Hi, VRaptor3 (http://vraptor.caelum.com.br/en) also works on GAE, with few customizations that can be properly downloaded on google code: http://code.google.com/p/vraptor3/downloads/list (Blank project for google app engine). Add VRaptor 3 to this page, please. Thanks, Lucas -- 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=.
[appengine-java] Restricted Class
Hi, What's the deal with all these restricted classes? http://groups.google.com/group/google-appengine-java/search?group=google-appengine-javaq=restricted+classqt_g=Search+this+group And can someone explain why we can't simply use a straightforward, simple, one-of-many-such Java Servlet implementations? 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=.
[appengine-java] Re: Local server works, Appspot fails with java.lang.StackOverflowError when Spring AOP is enabled
Was there any progress on this bug? -- 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=.
[appengine-java] Re: Moderation enabled
Jason, Are you still able to process it within 24 hours. I send a post 2 days ago. Marco On Sep 29, 7:55 am, Jason (Google) apija...@google.com wrote: Due to the recent uptick in spam messages, I have enabled moderation for new members -- this means that if you haven't posted here before, your message may not show up right away until I have the opportunity to approve it. Please do not double-post -- if you don't see your message right away, please wait up to 24 hours for it to be posted. Once your first post is up, all other posts should appear immediately. Thanks, - Jason -- 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=.
[appengine-java] Re: JSF 2.0.1 java.lang.ClassNotFoundException: void
I had a similar issue. The way I fixed it was to configure state saving to client rather than server. For details check my blog http://consultingblogs.emc.com/jaddy/archive/2009/11/20/jsf2-in-google-app-engine.aspx Let me know if this fixes your problem. On Nov 12, 6:15 pm, Mirco Attocchi ami...@gmail.com wrote: Problem using majorra 2.0.1 and GAE 1.2.6, but some times pages render correctly. javax.servlet.ServletException: java.lang.RuntimeException: java.lang.ClassNotFoundException: void at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle (AppVersionHandlerMap.java:240) at org.mortbay.jetty.handler.HandlerWrapper.handle (HandlerWrapper.java:139) at org.mortbay.jetty.Server.handle(Server.java:313) at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java: 506) at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete (HttpConnection.java:830) at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable (RpcRequestParser.java:76) at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381) at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceReques t (JettyServletEngineAdapter.java:139) at com.google.apphosting.runtime.JavaRuntime.handleRequest (JavaRuntime.java:239) at com.google.apphosting.base.RuntimePb$EvaluationRuntime $6.handleBlockingRequest(RuntimePb.java:5135) at com.google.apphosting.base.RuntimePb$EvaluationRuntime $6.handleBlockingRequest(RuntimePb.java:5133) at com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest (BlockingApplicationHandler.java:24) at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java: 363) at com.google.net.rpc.impl.Server$2.run(Server.java:814) at com.google.tracing.LocalTraceSpanRunnable.run (LocalTraceSpanRunnable.java:56) at com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan (LocalTraceSpanBuilder.java:516) at com.google.net.rpc.impl.Server.startRpc(Server.java:769) at com.google.net.rpc.impl.Server.processRequest(Server.java:351) at com.google.net.rpc.impl.ServerConnection.messageReceived (ServerConnection.java:437) at com.google.net.rpc.impl.RpcConnection.parseMessages (RpcConnection.java:319) at com.google.net.rpc.impl.RpcConnection.dataReceived (RpcConnection.java:290) at com.google.net.async.Connection.handleReadEvent(Connection.java: 436) at com.google.net.async.EventDispatcher.processNetworkEvents (EventDispatcher.java:762) at com.google.net.async.EventDispatcher.internalLoop (EventDispatcher.java:207) at com.google.net.async.EventDispatcher.loop(EventDispatcher.java: 101) at com.google.net.rpc.RpcService.runUntilServerShutdown (RpcService.java:251) at com.google.apphosting.runtime.JavaRuntime$RpcRunnable.run (JavaRuntime.java:396) at java.lang.Thread.run(Unknown Source) Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: void at com.google.apphosting.runtime.jetty.SessionManager.deserialize (SessionManager.java:389) at com.google.apphosting.runtime.jetty.SessionManager.loadSession (SessionManager.java:307) at com.google.apphosting.runtime.jetty.SessionManager.getSession (SessionManager.java:282) at org.mortbay.jetty.servlet.AbstractSessionManager.getHttpSession (AbstractSessionManager.java:237) at org.mortbay.jetty.Request.getSession(Request.java:998) at com.sun.faces.application.WebappLifecycleListener.syncSessionScopedBeans (WebappLifecycleListener.java:393) at com.sun.faces.application.WebappLifecycleListener.requestDestroyed (WebappLifecycleListener.java:117) at com.sun.faces.config.ConfigureListener.requestDestroyed (ConfigureListener.java:341) at org.mortbay.jetty.handler.ContextHandler.handle (ContextHandler.java:725) at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java: 405) at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle (AppVersionHandlerMap.java:238) ... 27 more Caused by: java.lang.ClassNotFoundException: void at com.google.appengine.runtime.Request.process-7a0672406190a0e0 (Request.java) ... 35 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-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=.
[appengine-java] Help With Images In Java
hi all, I need some help with images in appengine using java. Now I have sucessfully uploaded an image file and stored it to the datastore. I am also able to read back the stored image (as a byte[] array). Now the issue is, how do I display this image in my jsp page? *** //gets the image file Object from the read data d ImageFile f = d.getImg(); //gets the byte array of this image byte[] imb = f.getImg(); //futile attempt to display this image for(int i=0; iimb.length; i++) out.println(imb[i]); *** The above code displays the raw bytes on the jsp pageHow can I get this to display the image itself? Any help would be greatly appreciated.. 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=.
[appengine-java] Re: Server Code for Chat Service / Matchmaking
I'm also interested to hear on this from more experienced GAE developers. My understanding so far is that you can only reliably maintain state by persisting data to the data store on every request. You can put objects into the memory cache, but since that's volatie, i.e. can be blown away at any time, it's not reliable. Even using the servlet container for a single instance won't work because you have no control or notification over the number or lifespan of instances (e.g. it could be spun up to service your request and then be removed two seconds later). Intuitively, I don't see how maintaining state via per request retrieval and persistence could ever scale in a nontrivial app, but maybe that's a preconceived notion? I'd love to see some stats if someone has achieved this? On Nov 21, 10:35 pm, Craig craig.a.morri...@gmail.com wrote: Hi, I have some questions regarding the limits of server code in GAE. Can I write server code that isn't tied to an http request - i.e. a thread that would always be running on the server and which servlets could communicate with? From what I've read it isn't possible but I just wanted to confirm. The application I'm writing is analogous to a chat system where 10 users would log in and indicate their status (busy, idle, etc). I would prefer to be able to write a single server thread which would maintain this information and could give it to the individual servlets as needed. I.e. if I could write a persistent thread to manage this data I wouldn't need to deal with the data store, memcache, etc. I understand that this isn't possible - but please let me know if it is and what term I need to search for. Next, please let me know if the following architecture for my app makes sense. Since I cannot write a central thread to manage the information and respond to requests, I'll accomplish that using the memcache data store. As users update their status the servlets will update the data. Then when the other clients refresh themselves, the servlets that they spawn will retrieve everyone's status from the data store and return it to the client. Does this structure make sense or am I missing something? (Eventually I'll use ServerPush to accomplish the refresh but I don't think that is relevant to the question). Thanks for your response and advice, Craig -- 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=.
Re: [appengine-java] JDO x JPA
Both JDO and JPA support are built on top of the low-level API: http://code.google.com/appengine/docs/java/datastore/overview.html Anecdotally, I see more articles about JDO on App Engine, but my experience has been that there are more *general* JPA articles lying around, though they may not be applicable since they are more geared towards relational databases. There are also a number of developers simply building applications using the Low Level API. On Sat, Nov 21, 2009 at 9:56 AM, Rafael Reuber psico.in...@gmail.comwrote: Hi there, What's the better suport for GAE, JDO or JPA? I see many examples in JDO so I think that it have the better support. -- Rafael Reuber MSN/Gtalk: psico.in...@gmail.com -- 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=. -- Ikai Lan Developer Programs Engineer, Google App Engine -- 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=.
Re: [appengine-java] Ancestor queries in JPQL? / Getting Key of parameter value does not have a parent
I'm happy to add this to the official docs if it isn't clear. I think this makes sense under the JPA section or the section about ancestor queries. On Sun, Nov 22, 2009 at 11:24 PM, Rusty Wright rwright.li...@gmail.comwrote: There are way too many hidden secrets, like this parent-pk query, that are buried throughout the App Engine documentation. It would really be nice if these things were more clearly documented. Ikai L (Google) wrote: Hey Todd, There are a few different things you can do here: 1. Use the parent-pk filter. It looks something like this: query = pm.newQuery(select from Account + where parent-pk == keyParam + parameters Key keyParam); There's a groups thread about this here: http://groups.google.com/group/google-appengine-java/browse_thread/thread/97ba3209ec6a65de and the docs are here: http://code.google.com/appengine/docs/java/datastore/transactions.html#Using_Transactions(search 2. Use the low-level API. com.google.appengine.api.datastore.Query has a constructor that takes an Ancestor key. http://code.google.com/appengine/docs/java/javadoc/com/google/appengine/api/datastore/Query.html#Query(com.google.appengine.api.datastore.Key) Hope this helps. On Mon, Nov 16, 2009 at 4:29 PM, Todd Vierling t...@duh.org mailto:t...@duh.org wrote: Test app to reproduce: http://ancestortest.latest.duh-test.appspot.com/ Source code: http://ancestortest.latest.duh-test.appspot.com/src/ancestortest/AncestorTestServlet.java http://ancestortest.latest.duh-test.appspot.com/src/ancestortest/UserAccount.java http://ancestortest.latest.duh-test.appspot.com/src/ancestortest/UserAccountModification.java This sample code basically creates two UserAccount objects and attaches a UserAccountModification to one of them. Then, a query (which, unless the datastore is really slow, should return an empty list): = Query q = em.createQuery(select m from UserAccountModification m where m.modTime :newest and m.owner = :owner order by modTime desc); q.setParameter(newest, System.currentTimeMillis() - 1L); q.setParameter(owner, user1); ListUserAccountModification mods = q.getResultList(); = I get the following exception: javax.persistence.PersistenceException: SELECT FROM UserAccountModification m WHERE m.modTime :newest and m.owner = :owner ORDER BY modTime desc: Key of parameter value does not have a parent. at org.datanucleus.jpa.NucleusJPAHelper.getJPAExceptionForNucleusException (NucleusJPAHelper.java:264) at org.datanucleus.jpa.JPAQuery.getResultList(JPAQuery.java:179) at ancestortest.AncestorTestServlet.doGet(AncestorTestServlet.java: 46) I must be missing something here. The docs for GAE talk about ensuring the use of ancestor filters when inside a transaction, for instance, and there's the ANCESTOR IS operator in GQL. However, I can't seem to figure out how properly to express this in JPQL (as ANCESTOR IS is a syntax error there), and there's no docs that I can find on doing this in JPA. The query is meant to find UserAccountModification objects all residing under a given owner, which happens to be the ancestor of those objects. Is there a proper expression for this using JPQL? -- 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 mailto:google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-appengine-java%2bunsubscr...@googlegroups.com mailto:google-appengine-java%2bunsubscr...@googlegroups.comgoogle-appengine-java%252bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=. -- Ikai Lan Developer Programs Engineer, Google App Engine -- 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=. -- 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
Re: [appengine-java] Ancestor queries in JPQL? / Getting Key of parameter value does not have a parent
I'm thinking of something like a tips and tricks section that goes over these extensions as well as JDO/JPA things that might be particularly useful with GAE, with examples of how they're useful with GAE. For example, parent-pk, and then in Max's recent article, @PrePersist, @PreUpdate, and the JDO StoreCallback interface, which I didn't know about. Ikai L (Google) wrote: I'm happy to add this to the official docs if it isn't clear. I think this makes sense under the JPA section or the section about ancestor queries. On Sun, Nov 22, 2009 at 11:24 PM, Rusty Wright rwright.li...@gmail.com mailto:rwright.li...@gmail.com wrote: There are way too many hidden secrets, like this parent-pk query, that are buried throughout the App Engine documentation. It would really be nice if these things were more clearly documented. Ikai L (Google) wrote: Hey Todd, There are a few different things you can do here: 1. Use the parent-pk filter. It looks something like this: query = pm.newQuery(select from Account + where parent-pk == keyParam + parameters Key keyParam); There's a groups thread about this here: http://groups.google.com/group/google-appengine-java/browse_thread/thread/97ba3209ec6a65de and the docs are here: http://code.google.com/appengine/docs/java/datastore/transactions.html#Using_Transactions(search 2. Use the low-level API. com.google.appengine.api.datastore.Query has a constructor that takes an Ancestor key. http://code.google.com/appengine/docs/java/javadoc/com/google/appengine/api/datastore/Query.html#Query(com.google.appengine.api.datastore.Key) Hope this helps. On Mon, Nov 16, 2009 at 4:29 PM, Todd Vierling t...@duh.org mailto:t...@duh.org mailto:t...@duh.org mailto:t...@duh.org wrote: Test app to reproduce: http://ancestortest.latest.duh-test.appspot.com/ Source code: http://ancestortest.latest.duh-test.appspot.com/src/ancestortest/AncestorTestServlet.java http://ancestortest.latest.duh-test.appspot.com/src/ancestortest/UserAccount.java http://ancestortest.latest.duh-test.appspot.com/src/ancestortest/UserAccountModification.java This sample code basically creates two UserAccount objects and attaches a UserAccountModification to one of them. Then, a query (which, unless the datastore is really slow, should return an empty list): = Query q = em.createQuery(select m from UserAccountModification m where m.modTime :newest and m.owner = :owner order by modTime desc); q.setParameter(newest, System.currentTimeMillis() - 1L); q.setParameter(owner, user1); ListUserAccountModification mods = q.getResultList(); = I get the following exception: javax.persistence.PersistenceException: SELECT FROM UserAccountModification m WHERE m.modTime :newest and m.owner = :owner ORDER BY modTime desc: Key of parameter value does not have a parent. at org.datanucleus.jpa.NucleusJPAHelper.getJPAExceptionForNucleusException (NucleusJPAHelper.java:264) at org.datanucleus.jpa.JPAQuery.getResultList(JPAQuery.java:179) at ancestortest.AncestorTestServlet.doGet(AncestorTestServlet.java: 46) I must be missing something here. The docs for GAE talk about ensuring the use of ancestor filters when inside a transaction, for instance, and there's the ANCESTOR IS operator in GQL. However, I can't seem to figure out how properly to express this in JPQL (as ANCESTOR IS is a syntax error there), and there's no docs that I can find on doing this in JPA. The query is meant to find UserAccountModification objects all residing under a given owner, which happens to be the ancestor of those objects. Is there a proper expression for this using JPQL? -- 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 mailto:google-appengine-java@googlegroups.com mailto:google-appengine-java@googlegroups.com mailto:google-appengine-java@googlegroups.com.
Re: [appengine-java] JDO x JPA
If you look at Max's examples and test code he does everything in both JDO and JPA, so it seems to me that it's a coin toss. I went with JDO because I heard that it's not as strongly oriented to relational sql databases. Rafael Reuber wrote: Hi there, What's the better suport for GAE, JDO or JPA? I see many examples in JDO so I think that it have the better support. -- Rafael Reuber MSN/Gtalk: psico.in...@gmail.com mailto:psico.in...@gmail.com -- 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=. -- 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=.
Re: [appengine-java] Help:I can't make a object persistent completely.
Try
@Persistent(defaultFetchGroup = true)
on anything that's not listed in the Core Value Types table on
http://code.google.com/appengine/docs/java/datastore/dataclasses.html
Jolam wrote:
This is the object:
___
@PersistenceCapable(identityType = IdentityType.APPLICATION,
detachable = true)
public class Client implements java.io.Serializable {
@Persistent
private ArrayListOneService serviceRecords;
@Persistent
private ArrayListOneService serviceNow;
@Persistent
private String remarks;
..
public ArrayListOneService getServiceRecords() {
return serviceRecords;
}
public void setServiceRecords(ArrayListOneService serviceRecords) {
this.serviceRecords.clear();
for (int i = 0; i serviceRecords.size(); i++) {
this.serviceRecords.add(serviceRecords.get(i));
}
}
public ArrayListOneService getServiceNow() {
return serviceNow;
}
public void setServiceNow(ArrayListOneService serviceNow) {
this.serviceNow.clear();
for (int i = 0; i serviceRecords.size(); i++) {
this.serviceNow.add(serviceNow.get(i));
when i try to make this kind of Object pesistent like this:
___
ArrayListOneService serviceNow = new ArrayListOneService();
serviceNow.add(oneservice);
client.setServiceNow(serviceNow);
___
the ArrayList serviceNow in the Object doesn't contains another
object oneservice i want to add into the ArrayListserviceNow.
p.s. my english is bad and if it makes u confused because of my poor
expression,i beg your pardon.
--
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=.
--
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=.
[appengine-java] Re: Now available: JDO/JPA preview release with inheritance support
http://datanucleus-appengine.googlecode.com/files/appengine-orm-1.0.4.RC1.zip
This release provides support for inheritance of native datastore types and
embedded classes.
Can't get inheritance to run. Tested on *-1.0.3 and *-1.0.4.RC1.
Without AbstractEntity, 2 entities with OneToMany relationship works
perfectly. Is it the problem with Key id type? NullPointerException
is thrown when i access child list element:
public void test() {
ListParentEntity parents = tdao.load();
for (ParentEntity pe : parents) {
ListChildEntity childs = pe.getChilds();
System.out.println(.. childs.size: + childs.size());
for(ChildEntity ce : childs) { // - NPE
}
}
}
@Entity
@MappedSuperclass
public abstract class AbstractEntity {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Key id;
private String name;
...
}
@Entity
public class ParentEntity extends AbstractEntity {
@OneToMany(mappedBy=parent, cascade=CascadeType.ALL)
private ListChildEntity childs;
...
}
@Entity
public class ChildEntity extends AbstractEntity {
private Long value;
@ManyToOne
private ParentEntity parent;
...
}
Nov 23, 2009 8:20:34 PM com.google.apphosting.utils.jetty.JettyLogger
warn
WARNING: Nested in
org.springframework.web.util.NestedServletException: Request
processing failed; nested exception is java.lang.NullPointerException:
java.lang.NullPointerException
at
org.datanucleus.store.mapped.mapping.PersistenceCapableMapping.getObjectForApplicationIdentity
(PersistenceCapableMapping.java:971)
at
org.datanucleus.store.mapped.mapping.PersistenceCapableMapping.getObject
(PersistenceCapableMapping.java:720)
at
org.datanucleus.store.appengine.DatastoreRelationFieldManager.lookupParent
(DatastoreRelationFieldManager.java:309)
at
org.datanucleus.store.appengine.DatastoreRelationFieldManager.fetchRelationField
(DatastoreRelationFieldManager.java:289)
at
org.datanucleus.store.appengine.DatastoreFieldManager.fetchObjectField
(DatastoreFieldManager.java:271)
at org.datanucleus.state.AbstractStateManager.replacingObjectField
(AbstractStateManager.java:1197)
at gae.test.ChildEntity.jdoReplaceField(ChildEntity.java)
at gae.test.AbstractEntity.jdoReplaceFields(AbstractEntity.java)
at org.datanucleus.state.JDOStateManagerImpl.replaceFields
(JDOStateManagerImpl.java:2772)
at org.datanucleus.state.JDOStateManagerImpl.replaceFields
(JDOStateManagerImpl.java:2791)
at
org.datanucleus.store.appengine.DatastorePersistenceHandler.fetchObject
(DatastorePersistenceHandler.java:443)
at org.datanucleus.store.appengine.query.DatastoreQuery.entityToPojo
(DatastoreQuery.java:433)
at
org.datanucleus.store.appengine.DatastoreElementContainerStoreSpecialization.getChildren
(DatastoreElementContainerStoreSpecialization.java:103)
at org.datanucleus.store.appengine.DatastoreFKListStore.listIterator
(DatastoreFKListStore.java:47)
at
org.datanucleus.store.mapped.scostore.AbstractListStore.listIterator
(AbstractListStore.java:84)
at org.datanucleus.store.mapped.scostore.AbstractListStore.iterator
(AbstractListStore.java:74)
at org.datanucleus.sco.backed.List.loadFromStore(List.java:241)
at org.datanucleus.sco.backed.List.iterator(List.java:507)
at java.util.AbstractCollection.toString(AbstractCollection.java:414)
at java.lang.String.valueOf(String.java:2826)
at java.lang.StringBuilder.append(StringBuilder.java:115)
at gae.test.TestServiceImpl.openParentsWithChilds
(TestServiceImpl.java:27)
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.google.appengine.tools.development.agent.runtime.Runtime.invoke
(Runtime.java:100)
at
org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection
(AopUtils.java:307)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint
(ReflectiveMethodInvocation.java:183)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed
(ReflectiveMethodInvocation.java:150)
at
org.springframework.transaction.interceptor.TransactionInterceptor.invoke
(TransactionInterceptor.java:107)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed
(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke
(JdkDynamicAopProxy.java:202)
at $Proxy28.openParentsWithChilds(Unknown Source)
at gae.test.TestController.test(TestController.java:17)
at
Re: [appengine-java] Re: convert JDO query to JPA
Here's a video from Google I/O last year about complex data modeling on App
Engine. It talks a little bit about how we do indexing underneath the hood:
http://www.youtube.com/watch?v=AgaL6NGpkB8
Look for an upcoming article about the subject. App Engine Datastore is
built on top of BigTable. It's not really voodoo, the properties are
simply indexed. The reason it may seem strange is because coming from an
RDBMS world, this just isn't something that is done. In App Engine, however,
the way indexing works allows us to be flexible in what data types it allows
us to surface and the ways we allow users to query those data types.
Here are my example classes:
Dog.java: http://pastie.org/711953
ListFriendsServlet.java: http://pastie.org/711959
import com.google.appengine.api.datastore.Key;
import javax.persistence.*;
import java.util.List;
import java.util.LinkedList;
@Entity
public class Dog {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Key key;
@Basic
private String name;
@Basic
private int age;
private ListKey dogFriends;
public Dog(String name, int age) {
this.name = name;
this.age = age;
}
public Dog() {
this(Lucky, 5);
}
public Key getKey() {
return key;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public void addDogFriend(Key key){
if (this.dogFriends == null) {
this.dogFriends = new LinkedListKey();
}
this.dogFriends.add(key);
}
public ListKey getDogFriends(){
return this.dogFriends;
}
@Override
public String toString() {
return Dog{ +
key= + key +
, name=' + name + '\'' +
, age= + age +
'}';
}
}
import EMF;
import Dog;
import com.google.appengine.api.datastore.Key;
import com.google.appengine.api.datastore.KeyFactory;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
import javax.persistence.EntityManager;
import javax.persistence.Query;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
public class ListFriendsServlet extends HttpServlet {
@SuppressWarnings(unchecked)
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
String keyString = request.getParameter(friend);
Key key = KeyFactory.stringToKey(keyString);
EntityManager em = EMF.get().createEntityManager();
PrintWriter out = response.getWriter();
ListDog dogs;
try {
Query query = em.createQuery(SELECT FROM Dog WHERE
dogFriends = :key);
query.setParameter(key, key);
dogs = (ListDog) query.getResultList();
dogs.size(); // Do this so we can eager load the list and
close the EMF
} finally {
em.close();
}
out.println(Listing dogs);
for(Dog dog : dogs) {
out.println(dog);
}
}
}
The other classes describe adding Dogs and Dog friends and aren't terribly
interesting.
On Sun, Nov 22, 2009 at 2:49 PM, lp lucio.picc...@gmail.com wrote:
Can you post the JPA version of your entity?
@Entity
public class Friend {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Key key;
private String lastName;
public int crud;
private String firstName;
@Basic
private CollectionKey friends;
I've just built something similar, and if I pass a Key to:
query.setParameter(key, key);
This works correctly, though if I pass the String key to it
query.setParameter(key, someLongString);
what was ur query? was the query to filter on a collection?
i have set the parameters against primitive members successfully but
not against collection members.
It returns an empty list. Could this be what is happening?
no.i just retested my code to make sure i hadnt messed up. i am
definitely using a Key not a string.
//JPA
javax.persistence.Query query = em.createQuery(select from Friend f
where f.friends=:key);
query.setParameter(key, user2.getKey());
return list of 0
using the *same* JPA entity code the JDO works fine
//JDO
javax.jdo.Query query = pm.newQuery(Friend.class);
Key myKey = user2.getKey();
query.declareParameters(com.google.appengine.api.datastore.Key
myKey);
query.setFilter(friends == myKey);
query.setOrdering(lastName ASC, firstName ASC);
ListFriend friendList = (ListFriend) query.execute(myKey);
return correct list
Q1 can u post your JPA code so i can see what u have done differently?
Q2. is mixing JPA and JDO
Re: [appengine-java] Re: Now available: JDO/JPA preview release with inheritance support
Thanks for the report! I've made a lot of fixes since the RC1 build but
they're not backwards-compatible with the 1.2.6 SDK, so unfortunately I
can't release them until the next SDK is out. Your test case works for me
with my latest build so this will behave correctly in the next release.
Thanks,
Max
On Mon, Nov 23, 2009 at 1:56 PM, R. A. ramanauskas.ado...@gmail.com wrote:
http://datanucleus-appengine.googlecode.com/files/appengine-orm-1.0.4.RC1.zip
This release provides support for inheritance of native datastore types
and embedded classes.
Can't get inheritance to run. Tested on *-1.0.3 and *-1.0.4.RC1.
Without AbstractEntity, 2 entities with OneToMany relationship works
perfectly. Is it the problem with Key id type? NullPointerException
is thrown when i access child list element:
public void test() {
ListParentEntity parents = tdao.load();
for (ParentEntity pe : parents) {
ListChildEntity childs = pe.getChilds();
System.out.println(.. childs.size: + childs.size());
for(ChildEntity ce : childs) { // - NPE
}
}
}
@Entity
@MappedSuperclass
public abstract class AbstractEntity {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Key id;
private String name;
...
}
@Entity
public class ParentEntity extends AbstractEntity {
@OneToMany(mappedBy=parent, cascade=CascadeType.ALL)
private ListChildEntity childs;
...
}
@Entity
public class ChildEntity extends AbstractEntity {
private Long value;
@ManyToOne
private ParentEntity parent;
...
}
Nov 23, 2009 8:20:34 PM com.google.apphosting.utils.jetty.JettyLogger
warn
WARNING: Nested in
org.springframework.web.util.NestedServletException: Request
processing failed; nested exception is java.lang.NullPointerException:
java.lang.NullPointerException
at
org.datanucleus.store.mapped.mapping.PersistenceCapableMapping.getObjectForApplicationIdentity
(PersistenceCapableMapping.java:971)
at
org.datanucleus.store.mapped.mapping.PersistenceCapableMapping.getObject
(PersistenceCapableMapping.java:720)
at
org.datanucleus.store.appengine.DatastoreRelationFieldManager.lookupParent
(DatastoreRelationFieldManager.java:309)
at
org.datanucleus.store.appengine.DatastoreRelationFieldManager.fetchRelationField
(DatastoreRelationFieldManager.java:289)
at
org.datanucleus.store.appengine.DatastoreFieldManager.fetchObjectField
(DatastoreFieldManager.java:271)
at org.datanucleus.state.AbstractStateManager.replacingObjectField
(AbstractStateManager.java:1197)
at gae.test.ChildEntity.jdoReplaceField(ChildEntity.java)
at gae.test.AbstractEntity.jdoReplaceFields(AbstractEntity.java)
at org.datanucleus.state.JDOStateManagerImpl.replaceFields
(JDOStateManagerImpl.java:2772)
at org.datanucleus.state.JDOStateManagerImpl.replaceFields
(JDOStateManagerImpl.java:2791)
at
org.datanucleus.store.appengine.DatastorePersistenceHandler.fetchObject
(DatastorePersistenceHandler.java:443)
at org.datanucleus.store.appengine.query.DatastoreQuery.entityToPojo
(DatastoreQuery.java:433)
at
org.datanucleus.store.appengine.DatastoreElementContainerStoreSpecialization.getChildren
(DatastoreElementContainerStoreSpecialization.java:103)
at org.datanucleus.store.appengine.DatastoreFKListStore.listIterator
(DatastoreFKListStore.java:47)
at
org.datanucleus.store.mapped.scostore.AbstractListStore.listIterator
(AbstractListStore.java:84)
at org.datanucleus.store.mapped.scostore.AbstractListStore.iterator
(AbstractListStore.java:74)
at org.datanucleus.sco.backed.List.loadFromStore(List.java:241)
at org.datanucleus.sco.backed.List.iterator(List.java:507)
at
java.util.AbstractCollection.toString(AbstractCollection.java:414)
at java.lang.String.valueOf(String.java:2826)
at java.lang.StringBuilder.append(StringBuilder.java:115)
at gae.test.TestServiceImpl.openParentsWithChilds
(TestServiceImpl.java:27)
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.google.appengine.tools.development.agent.runtime.Runtime.invoke
(Runtime.java:100)
at
org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection
(AopUtils.java:307)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint
(ReflectiveMethodInvocation.java:183)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed
(ReflectiveMethodInvocation.java:150)
at
[appengine-java] Persistable JDO object - low-level entity?
Hey all, Are there any built in tools in the API to translate a managed JDO object into a low-level Entity? I want to do a batch put of some JDO-managed objects and some low- level Entities. If I could translate JDO-managed objects into bigtable Entities, I could do this in one call to the low-level API rather than one call to persistenceManager.makePersistentAll(Collection) and another to datastoreService.put(IterableEntity). Thanks for the help! Erem -- 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=.
[appengine-java] Re: Help With Images In Java
Found this doc on Google, it might help you : http://balusc.blogspot.com/2007/04/imageservlet.html#ImageServletServingFromDatabase On 20 nov, 05:09, java-dev sehgal@gmail.com wrote: hi all, I need some help with images in appengine using java. Now I have sucessfully uploaded an image file and stored it to the datastore. I am also able to read back the stored image (as a byte[] array). Now the issue is, how do I display this image in my jsp page? *** //gets the image file Object from the read data d ImageFile f = d.getImg(); //gets the byte array of this image byte[] imb = f.getImg(); //futile attempt to display this image for(int i=0; iimb.length; i++) out.println(imb[i]); *** The above code displays the raw bytes on the jsp pageHow can I get this to display the image itself? Any help would be greatly appreciated.. 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=.
[appengine-java] Re: bulkloader dump and restore
Thanks Ikai. The approach you suggested for exporting the key field
worked for me.
Len
On Nov 19, 5:36 pm, Ikai L (Google) ika...@google.com wrote:
Len,
I assume you are doing this by having different application versions for a
Python application and Java application as documented here:
http://googleappengine.blogspot.com/2009/06/10-things-you-probably-di...
Then redefining your Java data class in Python in your Exporter class and
passing a string similar to this to appcfg.py:
appcfg.py --server=python.latest.YOURAPPID.appspot.com download_data APPDIR
--filename=output.csv --kind=Thing --config_file=APPDIR/thing_exporter.py
There's a trick you'll need to export the key. Here's my Thing.java
(http://pastie.org/706983):
import com.google.appengine.api.datastore.Key;
import javax.jdo.annotations.*;
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Thing {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key key;
@Persistent
private String name;
@Persistent
private int number;
public Thing(String name, int number) {
this.name = name;
this.number = number;
}
public Key getKey() {
return key;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getNumber() {
return number;
}
public void setNumber(int number) {
this.number = number;
}
}
Here's the corresponding Python exporter code (http://pastie.org/706981):
from google.appengine.ext import db
from google.appengine.tools import bulkloader
class Thing(db.Model):
name = db.StringProperty()
number = db.IntegerProperty()
def AddKeys(entity_generator):
for entity in entity_generator:
entity['key'] = entity.key()
yield entity
class ThingExporter(bulkloader.Exporter):
def __init__(self):
bulkloader.Exporter.__init__(self, 'Thing',
[('key', str, None),
('name', str, None),
('number', str, None)
])
def output_entities(self, entity_generator):
bulkloader.Exporter.output_entities(self, AddKeys(entity_generator))
exporters = [ThingExporter]
The magic here is in the AddKey that you define. You add the key field to
the objects in each iteration of your loop exporting an entity.
On Fri, Nov 13, 2009 at 4:15 PM, lent lentakeu...@gmail.com wrote:
Hello,
I got python bulkloader upload data and download data working with
loader and exporter for my java app. Do the bulkloader dump and
restore options work when used with java app? They don't seem to work
for me. I get an error like:
BadRequestError: app xxx cannot access app bulkload.latest.xxx's data
When doing download data, how can I get the id field exported, i.e.
what do you need to specify in the exporter to export the id field? I
tried field names such as key and id (of type db.Key) but they didn't
work.
Regards,
Len
--
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=.
--
Ikai Lan
Developer Programs Engineer, Google App Engine- Hide quoted text -
- Show quoted text -
--
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=.
[appengine-java] app engine session variable
Hi, I am trying to store an object in the session in servlet by req.getSession().setAttribute(portofolio, portofolio); where portofolio is an object with about 10variables and functions. However, App engine behaves strangely when I do this, so I resorted to just saving strings into session attributes. Is this the correct behaviour? (where I could not set arbitrary object except string into session attributes?) Many 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.
Re: [appengine-java] InputStream read returning -1, but avalible btyes correct ?
FYI a couple of notes:
1) InputStream.available() only tells you how many bytes can be read without
blocking. From its specification:
It is never correct to use the return value of this method to allocate a
buffer intended to hold all data in this stream.
Just don't use it.
2) InputStream.read() is not guaranteed to fill your buffer. You must always
use it in a loop.
On Mon, Nov 23, 2009 at 5:50 PM, Ikai L (Google) ika...@google.com wrote:
What are you posting? This code works for me:
public class TestPostServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException {
InputStream in = request.getInputStream();
int size = in.available();
byte[] body = new byte[size];
int status = in.read(body);
in.close();
response.getWriter().println(Status of read: + status + Size:
+ size);
response.getWriter().println(Got your post: + new String(body));
}
}
What mechanism are you using to POST to your application? Is it a browser
form or a custom client?
On Sat, Nov 21, 2009 at 12:37 PM, Bourke Floyd IV chb...@gmail.comwrote:
//This was working before I overhauled the authentication of my app
//I'm trying to store the body of a Http POST as Text, I also plan on
doing a Blob version
//The maxLength is returning the correct size, but the read is
returning -1 instead of properly
//updating the body byte array
//...
InputStream httpIn = req.getInputStream();
byte[] body = new byte[httpIn.available()];
httpIn.read(body);
Text myPostBody = new Text(new String(body)); //wasteful maybe? but
should work
//...
//My old code was roughly the same
//...
int maxLength = req.getContentLength();
byte[] body = new byte[maxLength];
InputStream httpIn = req.getInputStream();
httpIn.read(body, 0, maxLength);
String myPostBody = new String(body); //wasteful maybe? but should
work
//...
--
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=.
--
Ikai Lan
Developer Programs Engineer, Google App Engine
--
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=.
--
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: InputStream read returning -1, but avalible btyes correct ?
//I figured out the problem. Example case: POST Request from a webpage
with 2 text fields (userEmail = '5...@gmail.com', and favCar =
'corvette')
//If I use
String email = req.getParameter(userEmail)
//and then try to get the whole body of the POST
InputStream inputStream = req.getInputStream();
if (inputStream != null) {
byte[] body = new byte[inputStream.available()];
inputStream.read(body);
String body = new String(body);
}
//body =
//but if I comment out the use of ANY getParameter Call, I get body
fine.
//Also, the reverse also holds true
//if you get the body using the InputStream, then try to use
getParameter
//then all of your getParameters will return null
//I don't know if this is by design or a bug because I'm not
experienced Java Programmer
-Bourke
On Nov 23, 5:50 pm, Ikai L (Google) ika...@google.com wrote:
What are you posting? This code works for me:
public class TestPostServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException {
InputStream in = request.getInputStream();
int size = in.available();
byte[] body = new byte[size];
int status = in.read(body);
in.close();
response.getWriter().println(Status of read: + status + Size:
+ size);
response.getWriter().println(Got your post: + new String(body));
}
}
What mechanism are you using to POST to your application? Is it a browser
form or a custom client?
On Sat, Nov 21, 2009 at 12:37 PM, Bourke Floyd IV chb...@gmail.com wrote:
//This was working before I overhauled the authentication of my app
//I'm trying to store the body of a Http POST as Text, I also plan on
doing a Blob version
//The maxLength is returning the correct size, but the read is
returning -1 instead of properly
//updating the body byte array
//...
InputStream httpIn = req.getInputStream();
byte[] body = new byte[httpIn.available()];
httpIn.read(body);
Text myPostBody = new Text(new String(body)); //wasteful maybe? but
should work
//...
//My old code was roughly the same
//...
int maxLength = req.getContentLength();
byte[] body = new byte[maxLength];
InputStream httpIn = req.getInputStream();
httpIn.read(body, 0, maxLength);
String myPostBody = new String(body); //wasteful maybe? but should
work
//...
--
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%2B
unsubscr...@googlegroups.com
.
For more options, visit this group at
http://groups.google.com/group/google-appengine-java?hl=.
--
Ikai Lan
Developer Programs Engineer, Google App Engine
--
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.
Re: [appengine-java] JDO x JPA
For GAE it developers it will be mostly a matter of preference. There are purists on both sides of the fence, although from a market share perspective I think JPA has the upper hand. I base this on the number of recent articles, support by commercial application containers, and job applicants. Personally, I prefer the annotations of JPA. To me a Class is an Entity (which is a noun) while JDO use Persistable which is not even a real word, and if it was, would be an adjective. :-) Tim On Nov 23, 2009, at 2:42 PM, Ikai L (Google) wrote: Both JDO and JPA support are built on top of the low-level API: http://code.google.com/appengine/docs/java/datastore/overview.html Anecdotally, I see more articles about JDO on App Engine, but my experience has been that there are more *general* JPA articles lying around, though they may not be applicable since they are more geared towards relational databases. There are also a number of developers simply building applications using the Low Level API. On Sat, Nov 21, 2009 at 9:56 AM, Rafael Reuber psico.in...@gmail.comwrote: Hi there, What's the better suport for GAE, JDO or JPA? I see many examples in JDO so I think that it have the better support. -- Rafael Reuber MSN/Gtalk: psico.in...@gmail.com -- 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=. -- Ikai Lan Developer Programs Engineer, Google App Engine -- 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= . -- 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: convert JDO query to JPA
EntityManager em = EMF.get().createEntityManager();
PrintWriter out = response.getWriter();
ListDog dogs;
try {
Query query = em.createQuery(SELECT FROM Dog WHERE
dogFriends = :key);
query.setParameter(key, key);
dogs = (ListDog) query.getResultList();
dogs.size(); // Do this so we can eager load the list and
solve it!
running your code in my unit test i still get a 0 size result list.
*until* i added the following in my unittest
Dog user1 = new Dog()
//blah blah
em.merge(user1);
em.close(); -- needed to close existing em
em = getEnityManager();
//query now executes correctly
it seems that the entity manager is not working as i expected.
by doing em.close after making objects persistent and then getting new
em, allowed the em.query to execute correctly.
i am not clear of why the em behaviours like that, given the em.find()
seem to find the correct object.
any ideas?
-lp
--
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: convert JDO query to JPA
EntityManager em = EMF.get().createEntityManager();
PrintWriter out = response.getWriter();
ListDog dogs;
try {
Query query = em.createQuery(SELECT FROM Dog WHERE
dogFriends = :key);
query.setParameter(key, key);
dogs = (ListDog) query.getResultList();
dogs.size(); // Do this so we can eager load the list and
solve it!
running your code in my unit test i still get a 0 size result list.
*until* i added the following in my unittest
Dog user1 = new Dog()
//blah blah
em.merge(user1);
em.close(); -- needed to close existing em
em = getEnityManager();
//query now executes correctly
it seems that the entity manager is not working as i expected.
by doing em.close after making objects persistent and then getting new
em, allowed the em.query to execute correctly.
i am not clear of why the em behaviours like that, given the em.find()
seem to find the correct object.
any ideas?
-lp
--
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] How to remove property of java object(POJO) with safty?
Environment :GAE for java, JPA I defined a java object(POJO) and stored some data in it. But later I found a property of that java object(POJO) was useless, and there was no data in that property.So I removed that property, but that caused a big problem, the data in that java object(POJO) can not be displayed by program. So could you tell me how to deal with it? I want to remove the useless property of java object(POJO) , and want original data can be displayed by program. 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-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: problem with using session.getAttribute()
I also have the same issue when retrieving session objects from a servlet filter, and running in the local sandbox. On Nov 21, 10:11 pm, Sanjay sanjaykumar.pa...@gmail.com wrote: Did you solve this problem? I am facing exactly same problem, it would be nice if you could share the solution if you found one. Thank you -- 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: JDO x JPA
http://www.datanucleus.org/products/accessplatform_2_0/persistence_api.html -- 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: app engine session variable
What strange behaviour exactly? I think you should serialize the portfolio object before you should store it to session. Another thing is, IMO you should not store too many things to the session. But that's me. I'd like to know other people's thoughts On Nov 24, 9:37 am, Don lydonchan...@gmail.com wrote: Hi, I am trying to store an object in the session in servlet by req.getSession().setAttribute(portofolio, portofolio); where portofolio is an object with about 10variables and functions. However, App engine behaves strangely when I do this, so I resorted to just saving strings into session attributes. Is this the correct behaviour? (where I could not set arbitrary object except string into session attributes?) Many 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.
