[appengine-java] Re: HTTP POST failing in dev environment with SDK 1.4.3
No, I'm not hitting deadline. I'm POSTing login credentials so it's a small HTTP request. The problem disappears as soon as I switch back to 1.4.2. On Apr 3, 4:54 am, branflake2267 branflake2...@gmail.com wrote: My posts are working for 1.4.3, although, you can hit deadlines. What are you posting? Brandon Donnelsonhttp://gwt-examples.googlecode.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-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] Best practice for multithreaded access/update to entity
I have an application that accesses a user entity. This entity also contains a number of user specific settings that the user can update. Some of those settings are updated by different servlets in parallel (for instance uploading a profile picture to the blobstore) I'm having some serious issues keeping everything in sync. If I'm not careful, I can easily overwrite updates that have been done in another thread. I have the feeling this is a recurring issue for many GAE application, so I'm looking for some best practices of how to deal with it. In the relational world, often a version column is added. Before updating a row, the version number in the database is compared to the one in memory. I suppose I can implement something like that on GAE too, but I was wondering whether there are better/other options available in the NoSQL world. Regards, Peter -- 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] Help ! Datanucleus class cast Exception
Firstly apologies if I have posted in the wrong place, I am sure someone will kindly tell me where is more appropriate. I have built a new application, I have already deployed one with identical architecture successfully but not encountered this error before. My application runs well on Tomcat accessing a local H2 database but when I test again the GAEJ Development server and when I deploy to Google Apps and run for real I get the following exception. I have check all my jar files for multipe versions etc but can't get to the bottom of this, can someone help ? (This trace is from the development server pointing at the same location that Tomcat runs from) java.lang.ClassCastException: org.datanucleus.query.expression.ParameterExpression cannot be cast to org.datanucleus.query.expression.PrimaryExpression at org.datanucleus.store.appengine.query.DatastoreQuery.getSortProperty(DatastoreQuery.java:793) at org.datanucleus.store.appengine.query.DatastoreQuery.addSorts(DatastoreQuery.java:772) at org.datanucleus.store.appengine.query.DatastoreQuery.performExecute(DatastoreQuery.java:231) at org.datanucleus.store.appengine.query.JDOQLQuery.performExecute(JDOQLQuery.java:89) at org.datanucleus.store.query.Query.executeQuery(Query.java:1489) at org.datanucleus.store.query.Query.executeWithArray(Query.java:1371) at org.datanucleus.jdo.JDOQuery.execute(JDOQuery.java:243) at mseries.routes.model.DataModel.saveTrack(DataModel.java:107) at mseries.routes.servlet.TrackUploadServlet.doGet(TrackUploadServlet.java:74) at javax.servlet.http.HttpServlet.service(HttpServlet.java:617) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166) at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:58) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388) at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765) at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418) at com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:70) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:351) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at org.mortbay.jetty.Server.handle(Server.java:326) at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542) at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923) at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547) at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212) at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409) at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582) -- 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: Help ! Datanucleus class cast Exception
Update: Digging into the source code for org.datanucleus.store.appengine.query.DatastoreQuery.getSortProperty allowed me to figure out what was causing the problem. In the follow code, the emboldened on is the one that threw the exception, it will be noticed that I have ordered by 'keyx' which is my parameter name and NOT the name or my attribute in the class JDOTrack, changing it to a proper attribute name works as expected. NB This was not a problem with Datanucleus and the rdbms persistence manager there. Query q = pm.newQuery(JDOTrack.class); q.setFilter(key == keyx ); q.declareParameters(String keyx); q.setUnique(true); * q.setOrdering(keyx ascending);* res = (JDOTrack) q.execute(key); -- 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: HTTP POST failing in dev environment with SDK 1.4.3
I also experienced it using the dyuproject library for OpenID authentication. It remained working fine on the app engine and I managed to get it to work locally as well by removing the Content- length header parameter. On Apr 2, 12:33 pm, rml radomi...@gmail.com wrote: I have an issue with local development server after upgrading to SDK 1.4.3. All HTTP POST requests fail with: java.io.IOException: Could not fetch URL:http://sitename/login.php Can anyone confirm that POST is working or failing in dev environment? I create an issue for this so if anyone else is experiencing this, please starhttp://code.google.com/p/googleappengine/issues/detail?id=4836 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-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: 1.4.3 Javadocs? Looking for the FileServiceFactory docs:
I apologize, we neglected to include the JavaDoc for the new File API
in the 1.4.3 release. It will be in 1.4.4 but I will look into posting
it somewhere temporarily. In the mean time, here is the JavaDoc for
the method you asked about:
/**
* Creates a new empty file in the BlobStore of the specified mime-
type and
* returns an {@code AppEngineFile} representing the file. The
returned
* instance will have a {@link AppEngineFile#getFileSystem() file
system} of
* {@link
com.google.appengine.api.files.AppEngineFile.FileSystem#BLOBSTORE
* BLOBSTORE}.
*
* @param mimeType the mime-type of the file to be created. This
parameter may
*be used to inform the BlobStore of the mime-type for the
file. The
*mime-type will be returned by the BlobStore in an HTTP
response if
*the file is requested directly from the BlobStore using
the
*blob-key.
* @param blobInfoUploadedFileName BlobStore will store this name in
the
*BlobInfo's fileName field. This string will emnot/em
be
*the {@link AppEngineFile#getNamePart() name} of the
returned
*{@code AppEngineFile}. It will be returned by the
BlobStore in an HTTP
*response if the file is requested directly from the
BlobStore using
*the blob-key.
* @return A {@code AppEngineFile} representing the newly created
file.
* @throws IOException If there is any problem communicating with
the backend
* system
*/
AppEngineFile createNewBlobFile(String mimeType, String
blobInfoUploadedFileName)
throws IOException;
On Apr 2, 8:54 am, branflake2267 branflake2...@gmail.com wrote:
I'm looking for the new javadocs for FileServiceFactory and didn't see them
yet.
I wanted to find out what the method parameters were for
fileService.createNewBlobFile(param,param)? Is there a parameter for
filename?
AppEngineFile file = null;
try {
file = fileService.createNewBlobFile(contentType);
} catch (IOException e) {
e.printStackTrace();
}
Brandon Donnelsonhttp://gwt-examples.googlecode.com
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[appengine-java] Re: Could Not Verify SSL Certificate
Add this JVM arg to the appengine startup runtime, -Djavax.net.debug=ssl How can I do that? Is there an Eclipse setting for that? -- 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] JPA Error : When tried to use the type Key or encoded String
Hi Everyone , I am getting an error when tried to persist my class using the JPA. I am about to persist my child model . here is the snippet that generates the error, @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @Extension(vendorName=datanucleus, key=gae.encoded-pk, value=true) private String personId; I have tried key as well, @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Key personaId; I am getting the following error when tried to persist the object of the above class. Invalid Key PB: no elements. Caused by: java.lang.IllegalArgumentException: Invalid Key PB: no elements. at com.google.appengine.api.datastore.KeyTranslator.createFromPb(KeyTranslator.java: 26) at com.google.appengine.api.datastore.KeyFactory.stringToKey(KeyFactory.java: 197) Can anyone kindly help me to get out of this problem ? Thanks, Pradeep. -- 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] Resize image to exact size using ImagesService
Hi Is there a way to resize an image to an exact size? I am currently using this: ImagesServiceFactory.makeResize(width, height); However, this scales the image until it reaches either the height or width value to ensure the aspect ratio is maintained. This is not what I want, I would like to enter a specific width and height and have the image transformed to that size, even if it means the aspect ratio is changed. 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-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: JPA/JDO vs low level API
I've been using Java AppEngine since it became available. I chose JDO for portability and so I could get started very quickly. I can say that JDO offers very little real portability for significant apps because of the very different semantics of the underlying datastore. If I were developing for an SQL datastore, my datamodel would be pretty different. For instance, it is easy in most SQL datastores to use one or more fields as a unique, mutable secondary key (like an email address or Social Security Number). In the appengine datastore, if you have the datastore generate unique primary keys, but you want to enforce a unique mutable secondary key, you need to use a separate entity to serve as the secondary key mutex. This is a fine solution if you are using the low level API, because you can have your data access layer create and check this mutex so this does not bubble up to your application code. However, with JDO, you have to create another pojo and manage it so it can serve as the mutex. Ick. When I chose JDO, no wrapper for the low level existed and documentation of the low level was not great. JDO was well documented so I could get going fast. However, there are now several good alternative frameworks for using the low level datastore. If I were to start today, I would choose one of them and avoid JDO. Now that I know what I know, I will probably write my own low level wrapper so I have more flexibility and control. On Apr 2, 8:46 am, Jeff Schnitzer j...@infohazard.org wrote: An incomplete list of things that are difficult or impossible with JDO/JPA, but easy with Objectify/LowLevelAPI: * Partial indexes * Running multiple concurrent transactions, or (more likely) a transaction + a nontransaction. Because of GAE's transaction model, this is actually necessary quite often. * Migrating your schema. JDO/JPA is particularly brittle, you can't even add primitive fields to a class. * Serializing your entities. With JDO you must detach them explicitly, with JPA (as implemented by DataNucleus) you simply can't. In practice, the biggest difference after abandoning JDO/JPA is that you will stop screaming loudly at your computer, annoying your coworkers. Jeff (copied from the response to the same question on the objectify mailing list) On Fri, Apr 1, 2011 at 4:50 AM, SkYlEsS shou...@gmail.com wrote: I have a question : What are the differences between JPA/JDO and low level API (and Objectify) in practice ? I read everywhere the low level API provides more flexibility, but there are never samples code or evidences to demonstrate it. So I'm wondering in which cases exactly, the low level API is useful ? Thanks in advance -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group athttp://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] 1.4.3 remote_api upload Parent with Children
I'm trying to use to the new remote_api features to upload data. What is the best way to upload a parent with a list of owned children. Class Parent has ListChild children I tried uploading the Parent and using its key to create Keys for each of the children. child.setProperty(key, KeyFactory.createKey(parentKey, Child, null)); The KeyFactory call won't let name = null (even though all the existing entities have name = null) so I set name to an arbitrary string. When I did that the Parent and children were created but the Parents list of children was empty. So the association between the parent and children did not happen. -- 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: 1.4.3 remote_api upload Parent with Children
Figured it out, just create the the child entity with: Entity child = new Entity(Child, parentKey); children.add(child); ds.put(children) On Apr 3, 5:42 pm, mattkrae34 matt.krae...@gmail.com wrote: I'm trying to use to the new remote_api features to upload data. What is the best way to upload a parent with a list of owned children. Class Parent has ListChild children I tried uploading the Parent and using its key to create Keys for each of the children. child.setProperty(key, KeyFactory.createKey(parentKey, Child, null)); The KeyFactory call won't let name = null (even though all the existing entities have name = null) so I set name to an arbitrary string. When I did that the Parent and children were created but the Parents list of children was empty. So the association between the parent and children did not happen. -- 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: 1.4.3 Javadocs? Looking for the FileServiceFactory docs:
Ah, just what I needed. Thanks! Brandon -- 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: Best practice for multithreaded access/update to entity
Hi, Having a version (or even better a timestamp) for last update is also what I use to maintain integrity of my data. To manage it simply, a) I use a hierarchy of object all inheriting from a DsObject so that I to manage this version only in one place b) I use the @PrePersist annotation (from Objectify) to make it as transparent as possible regards didier On Apr 3, 2:10 pm, Peter Backx peter.ba...@gmail.com wrote: I have an application that accesses a user entity. This entity also contains a number of user specific settings that the user can update. Some of those settings are updated by different servlets in parallel (for instance uploading a profile picture to the blobstore) I'm having some serious issues keeping everything in sync. If I'm not careful, I can easily overwrite updates that have been done in another thread. I have the feeling this is a recurring issue for many GAE application, so I'm looking for some best practices of how to deal with it. In the relational world, often a version column is added. Before updating a row, the version number in the database is compared to the one in memory. I suppose I can implement something like that on GAE too, but I was wondering whether there are better/other options available in the NoSQL world. Regards, Peter -- 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: 1.4.3 Javadocs? Looking for the FileServiceFactory docs:
On Sunday, April 3, 2011 12:59:23 PM UTC-4, Mitch Rudominer wrote: I will look into posting it somewhere temporarily. files-javadoc.appspot.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-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.
