[appengine-java] Re: Exhaustive JPA/JDO tutorial
Thanks Esteban. This seems useful. Will read and post feedback later. On Sep 15, 12:02 am, Esteban Masoero emaso...@getsense.com.ar wrote: This should help:http://www.datanucleus.org/products/accessplatform_1_1/index.html Regards, Esteban Java_GAE escribió: Hi, Please anybody can post a link to exhaustive and intensive tutorial on JPA/JDO. I got head and tail from the google app engine tutorial but need to understand much more than that to create my application. Thanks in advance. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en -~--~~~~--~~--~--~---
[appengine-java] Fetch by string equality stopped working
I have a jpa/spring dao that returns a user by open id url. Running
on sdk 1.2.1, his worked without a problem. moving to 1.2.2, and now
1.2.5, it no longer returns any records. Returning all records and
using String.equals works fine:
String openIdUrl = http://blah/me;;
List results = em.createQuery(select u from +OpenIDUser.class.getName
()+ u where u.openIDUrl=?1).setParameter(1, openIdUrl).getResultList
();
//results is size 0
List l = em.createQuery(select u from +OpenIDUser.class.getName()+
u).getResultList();
for(Object o: l){
String url = ((OpenIDUser)o).getOpenIDUrl();
if(openIdUrl.equals(url)){
//string matches
return (OpenIDUser)o;
}
}
I am assuming I have inadvertently screwed something up in my
environment, but I'm struggling to get any more information - can
anyone suggest any pointers?
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[appengine-java] Regarding nullpoint exception
Hi i have been working with an application and when i send a url request thru the browser,iam getting a null point exception,so someone tell me how can i rectift dat error --~--~-~--~~~---~--~~ 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: Can I avoid Data Nucleus and still use JPA?
As leszek says I think you have a few things confused: DataNucleus is a JDO/JPA implementation that can run within AppEngine. AppEngine provides 2 persistence mechanisms, BigTable and VFS (Virtual File System). You cannot configure your GoogleApp to use an external RDBMS, nor can you host an RDBMS within your GoogleApp. Also note that with each DB record, BigTable effectively stores not only the data but also the metadata for the table. Ie all the column names are stored alongside the column data, for each record. So a Gigabyte of data will commonly consume 10GB of space within BigTable. Using GWT on your client is orthogonal, to the persistence on the server. However, if you have a clean JPA (non-Hibernate specific) implementation you might have a way continue to use JPA within your GoogleApp by using a H2 RDBMS implementation running on top of VFS. See http://groups.google.com/group/google-appengine-java/browse_thread/thread/fce7750aad2845ff?hl=en and http://groups.google.com/group/gaevfs/browse_thread/thread/c23b8af5791b3a4 On a side note, Andy (aka Datanucleus) you need to chill dude. Users are reporting problems with Datanucleus because they are feeling pain. Barking at them is not the way to win support and market share for Datanucleus, quite the opposite. William --~--~-~--~~~---~--~~ 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: Can I avoid Data Nucleus and still use JPA?
@WilliamF, I don't see how any of my responses in this thread can be construed even remotely as barking at somebody. In fact providing references to docs would likely be the opposite, as the user indeed recognised in his post. In fact you can review all of my responses to people over the last 5 months and judge that for yourself; some replies where more time was available to give a full response and others less. Obviously, in a written form, someone somewhere will always want to construe a response in some other way maybe due to the problems they themselves are having with some software and the subsequent frustration and want someone to blame. For the record, people in general are reporting problems with the Google-provided datanucleus plugin, not DataNucleus itself. There are actually no outstanding JIRAs for DataNucleus relating to AppEngine usage. I chip in here occasionally with help in my spare time, since DataNucleus is an open source project, to which anyone could volunteer their time. If that is inadequate for you then that is indeed unfortunate. Good luck with your application. --~--~-~--~~~---~--~~ 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: Can I avoid Data Nucleus and still use JPA?
Nobody can contradict that DataNucleus is a high quality software. The fact that it is Google's persistence provider of choice speaks for itself. --~--~-~--~~~---~--~~ 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: JDO/JPA Snippets That Work - Creating a bidirectional, owned, one-to-many relationship
Max,
Love the examples, however I have one question. In the GAE JDO documentation
there's much written about the KeyFactory, Builder(s) and creating hierarcal
Key(s). It's doesn't appear that your example has factored these in. I know
littered through out my code are KeyFactory and Builders for the child
objects. Should these Key Builders be included within your example?
Thank you,
Jeff
On Mon, Sep 14, 2009 at 7:07 PM, Max Ross
maxr+appeng...@google.commaxr%2bappeng...@google.com
wrote:
Hello hello and welcome to the very first installment of JDO/JPA Snippets
That Work!
Creating A Bidrectional Owned One-To-Many
Suppose you're building a book catalog application and you want to model
books and chapters. Books contain chapters. A chapter cannot exist without
a book, so if you delete a book you want its chapters automatically deleted
along with it. You also want to each chapter to have a reference to the
book that owns it. Sounds like a bidrectional, owned, one-to-many
relationship is just the thing. First we'll set up our model objects and
then we'll add some code to create a Book with 2 Chapters.
JPA:
@Entity
public class Book {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private Key id;
private String title;
@OneToMany(mappedBy = book, cascade = CascadeType.ALL)
private ListChapter chapters = new ArrayListChapter();
// getters and setters
}
@Entity
public class Chapter {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private Key id;
private String title;
private int numPages;
@ManyToOne(fetch = FetchType.LAZY)
private Book book;
// getters and setters
}
Now let's create a book with two chapters (we'll assume someone else is
creating and closing an EntityManager named 'em' for us):
Book b = new Book();
b.setTitle(JPA 4eva);
Chapter c1 = new Chapter();
c1.setTitle(Intro);
c1.setNumPages(10);
b.getChapters().add(c1);
Chapter c2 = new Chapter();
c2.setTitle(Configuration);
c2.setNumPages(9);
b.getChapters().add(c2);
em.getTransaction().begin();
try {
em.persist(b);
em.getTransaction().commit();
} finally {
if (em.getTransaction().isActive()) {
em.getTransaction().rollback();
}
}
JDO:
@PersistenceCapable(identityType = IdentityType.APPLICATION, detachable =
true)
public class Book {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key id;
private String title;
@Persistent(mappedBy = book)
@Element(dependent = true)
private ListChapter chapters = new ArrayListChapter();
// getters and setters
}
@PersistenceCapable(identityType = IdentityType.APPLICATION, detachable =
true)
public class Chapter {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key id;
private String title;
private int numPages;
@Persistent
private Book book;
// getters and setters
}
Now let's create a book with two chapters (we'll assume someone else is
creating and closing a PersistenceManager named 'pm' for us):
Book b = new Book();
b.setTitle(JDO 4eva);
Chapter c1 = new Chapter();
c1.setTitle(Intro);
c1.setNumPages(10);
b.getChapters().add(c1);
Chapter c2 = new Chapter();
c2.setTitle(Configuration);
c2.setNumPages(9);
b.getChapters().add(c2);
pm.currentTransaction().begin();
try {
pm.makePersistent(b);
pm.currentTransaction().commit();
} finally {
if (pm.currentTransaction().isActive()) {
pm.currentTransaction().rollback();
}
}
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[appengine-java] built in security features of GAE
Has anyone know the built in security features in GAE. Thanks in Advance --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en -~--~~~~--~~--~--~---
[appengine-java] Re: How to save GeoPt in JPA?
use geohash Sent from my iPhone On 15/09/2009, at 7:09 AM, Jason (Google) apija...@google.com wrote: Release 1.2.5 did add a GeoPt property type for Java so you can more easily store geographic coordinates in the datastore, but App Engine itself does not provide the logic necessary for doing bounding-box or other geo queries. As you said, there are several projects available for App Engine Python, but I don't know of any for Java, though they could still be out there. - Jason On Sat, Sep 12, 2009 at 1:55 PM, damenlon inhouse...@gmail.com wrote: Hi, There is a good Map tutorial, geodatastore, for Python. Is there one for Java using JPA? What I want to do is searching Geo Points within a boundary. 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: Bulk writes to datastore
Hi Larry I am wondering about writing a Servlet that would form/multi-part upload large files and cache them in memcache then use the cron API to trickle persist them into the DS over time ... I've been thinking about using something like this as well. I think you could likely cache the upload to the store because the limit here seems to be mainly the amount of entities, not the size of one entity (below 1mb). I have e.g. 100/200k worth of data that I upload, but because it's represented as a couple hundred entities it chokes. I could just upload the 93k and fire off a task (or cron job) that would parse and insert the data offline. At the very least, I plan to use the low-level api more. The (very useful) performance testing app http://gaejava.appspot.com/ shows consistently higher CPU usage from JDO. If this ever improves, that app should show it. Until then, low-level looks good. Regards, Richard --~--~-~--~~~---~--~~ 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: ArrayIndexOutOfBoundsException: at org.datanucleus.plugin.ConfigurationElement.putAttribute(Configuratio nElement.java:104)
No one has any update on this??? Thanks Patrizio Munzi wrote: Mmm, I think there's need of datanucleus experts. Hope someone could clarify this subject wada3 wrote: It would be bug or limitation of development environment. I have not met them on real appengine environment because container looks like running on single thread model. Normally it would not need to be synchronized I think. On Sep 11, 4:41pm, "patrizio.munzi" eris4.mu...@gmail.com wrote: Isn't this an important subject to address? Are all method calling the makePersistent method needed to be synchronized...?? Is this a bug..?? No one has any consideration??? Thanks On Sep 10, 10:35am, "patrizio.munzi" eris4.mu...@gmail.com wrote: I did a few more investigation and It looks like a threads safety problem. In fact if I synchronize the method com.myapp.server.datastore.EventsManager.addEvent whithin makePersistent is called everything works fine. I think here experts are needed.. :-) Bye On Sep 10, 10:18am, "patrizio.munzi" eris4.mu...@gmail.com wrote: Hi everybody I'm having an ArrayOutOfBoundException from nucleus... I don't know where it comes from... Can anyone give me some information about it... Here's the stack trace... --- The server is running athttp://localhost:8181/ java.lang.ArrayIndexOutOfBoundsException: 1187 at org.datanucleus.plugin.ConfigurationElement.putAttribute (ConfigurationElement.java:104) at org.datanucleus.store.appengine.DatastorePluginRegistry.getExtensionPoint (DatastorePluginRegistry.java:59) at org.datanucleus.plugin.PluginManager.getExtensionPoint (PluginManager.java:65) at org.datanucleus.plugin.PluginManager.getConfigurationElementForExtension (PluginManager.java:113) at org.datanucleus.plugin.PluginManager.getAttributeValueForExtension (PluginManager.java:230) at org.datanucleus.ObjectManagerImpl.getCallbackHandler (ObjectManagerImpl.java:3804) at org.datanucleus.state.AbstractStateManager.getCallbackHandler (AbstractStateManager.java:160) at org.datanucleus.state.JDOStateManagerImpl.initialiseForPersistentNew (JDOStateManagerImpl.java:466) at org.datanucleus.state.StateManagerFactory.newStateManagerForPersistentNew (StateManagerFactory.java:151) at org.datanucleus.ObjectManagerImpl.persistObjectInternal (ObjectManagerImpl.java:1297) at org.datanucleus.ObjectManagerImpl.persistObject (ObjectManagerImpl.java:1175) at org.datanucleus.jdo.JDOPersistenceManager.jdoMakePersistent (JDOPersistenceManager.java:669) at org.datanucleus.jdo.JDOPersistenceManager.makePersistent (JDOPersistenceManager.java:694) at com.myapp.server.datastore.EventsManager.addEvent (EventsManager.java:167) at com.myapp.server.restlet.EventResource.addEvent(EventResource.java: 30) at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.restlet.resource.ServerResource.doHandle(ServerResource.java: 390) at org.restlet.resource.ServerResource.doHandle(ServerResource.java: 328) at org.restlet.resource.ServerResource.doNegotiatedHandle (ServerResource.java:581) at org.restlet.resource.ServerResource.doConditionalHandle (ServerResource.java:254) at org.restlet.resource.ServerResource.handle(ServerResource.java: 923) at org.restlet.resource.Finder.handle(Finder.java:510) at org.restlet.routing.Filter.doHandle(Filter.java:156) at org.restlet.routing.Filter.handle(Filter.java:201) at org.restlet.routing.Router.doHandle(Router.java:321) at org.restlet.routing.Router.handle(Router.java:520) at org.restlet.routing.Filter.doHandle(Filter.java:156) at org.restlet.routing.Filter.handle(Filter.java:201) at org.restlet.routing.Filter.doHandle(Filter.java:156) at org.restlet.routing.Filter.handle(Filter.java:201) at org.restlet.routing.Filter.doHandle(Filter.java:156) at org.restlet.engine.application.StatusFilter.doHandle (StatusFilter.java:152) at org.restlet.routing.Filter.handle(Filter.java:201) at org.restlet.routing.Filter.doHandle(Filter.java:156) at org.restlet.routing.Filter.handle(Filter.java:201) at org.restlet.engine.ChainHelper.handle(ChainHelper.java:111) at org.restlet.engine.application.ApplicationHelper.handle (ApplicationHelper.java:72) at org.restlet.Application.handle(Application.java:344) at org.restlet.routing.Filter.doHandle(Filter.java:156) at org.restlet.routing.Filter.handle(Filter.java:201) at org.restlet.routing.Router.doHandle(Router.java:321) at org.restlet.routing.Router.handle(Router.java:520) at
[appengine-java] CPU Occasionally Spikes when HttpSession is Created
Hi Everyone,
I've noticed that CPU occasionally spikes when creating an
HTTPSession. It only seems to happen when it's been awhile since an
app has been accessed or when an app is initially deployed.
For example, I created a simple test servlet that creates a session
and and writes a response:
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
req.getSession();
PrintWriter writer = resp.getWriter();
writer.write(Test Complete);
writer.flush();
writer.close();
}
When I deploy the app and invoke the servlet for the first time, I see
the following in the admin console:
09-15 05:57AM 29.487 /test 200 7184ms 4381cpu_ms 65api_cpu_ms 0kb
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.6) Gecko/
2009011913 Firefox/3.0.6 (.NET C
Note the high CPU and long response time.
Subsequent session creations are much faster. If I delete my cookies
and re-invoke the servlet, CPU is approx. 70-80ms.
Now, if I leave the app for awhile (let's say an hour) and hit the
servlet again, CPU is once again through the roof for the initial
GET.
Any thoughts about what's going on here? I know that Google's session
management involves memcache and the datastore. Could the high CPU be
a side-effect of some initialization routine, etc...?
Thanks for the feedback,
Jamie
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[appengine-java] Re: Regarding debugging error
Replace: filter-classAuthFilter/filter-class With filter-classcom.org.login.AuthFilter/filter-class --~--~-~--~~~---~--~~ 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: JDO/JPA Snippets That Work - Creating a bidirectional, owned, one-to-many relationship
This example only demonstrates creation of parent and child when both parent
and child use datastore id generation. If you wanted to use a named Key for
either of these objects as opposed to datastore id generation, the
KeyFactory and the KeyFactory.Builder class would be involved. This would
also be the case if you were constructing a Key to perform a lookup of
either parent or child.
I plan to devote other snippets to more complicated Key-management
scenarios.
Thanks,
Max
On Tue, Sep 15, 2009 at 4:16 AM, Jeff Arbaugh jeffarba...@gmail.com wrote:
Max,
Love the examples, however I have one question. In the GAE JDO
documentation there's much written about the KeyFactory, Builder(s) and
creating hierarcal Key(s). It's doesn't appear that your example has
factored these in. I know littered through out my code are KeyFactory and
Builders for the child objects. Should these Key Builders be included within
your example?
Thank you,
Jeff
On Mon, Sep 14, 2009 at 7:07 PM, Max Ross
maxr+appeng...@google.commaxr%2bappeng...@google.com
wrote:
Hello hello and welcome to the very first installment of JDO/JPA Snippets
That Work!
Creating A Bidrectional Owned One-To-Many
Suppose you're building a book catalog application and you want to model
books and chapters. Books contain chapters. A chapter cannot exist without
a book, so if you delete a book you want its chapters automatically deleted
along with it. You also want to each chapter to have a reference to the
book that owns it. Sounds like a bidrectional, owned, one-to-many
relationship is just the thing. First we'll set up our model objects and
then we'll add some code to create a Book with 2 Chapters.
JPA:
@Entity
public class Book {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private Key id;
private String title;
@OneToMany(mappedBy = book, cascade = CascadeType.ALL)
private ListChapter chapters = new ArrayListChapter();
// getters and setters
}
@Entity
public class Chapter {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private Key id;
private String title;
private int numPages;
@ManyToOne(fetch = FetchType.LAZY)
private Book book;
// getters and setters
}
Now let's create a book with two chapters (we'll assume someone else is
creating and closing an EntityManager named 'em' for us):
Book b = new Book();
b.setTitle(JPA 4eva);
Chapter c1 = new Chapter();
c1.setTitle(Intro);
c1.setNumPages(10);
b.getChapters().add(c1);
Chapter c2 = new Chapter();
c2.setTitle(Configuration);
c2.setNumPages(9);
b.getChapters().add(c2);
em.getTransaction().begin();
try {
em.persist(b);
em.getTransaction().commit();
} finally {
if (em.getTransaction().isActive()) {
em.getTransaction().rollback();
}
}
JDO:
@PersistenceCapable(identityType = IdentityType.APPLICATION, detachable =
true)
public class Book {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key id;
private String title;
@Persistent(mappedBy = book)
@Element(dependent = true)
private ListChapter chapters = new ArrayListChapter();
// getters and setters
}
@PersistenceCapable(identityType = IdentityType.APPLICATION, detachable =
true)
public class Chapter {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key id;
private String title;
private int numPages;
@Persistent
private Book book;
// getters and setters
}
Now let's create a book with two chapters (we'll assume someone else is
creating and closing a PersistenceManager named 'pm' for us):
Book b = new Book();
b.setTitle(JDO 4eva);
Chapter c1 = new Chapter();
c1.setTitle(Intro);
c1.setNumPages(10);
b.getChapters().add(c1);
Chapter c2 = new Chapter();
c2.setTitle(Configuration);
c2.setNumPages(9);
b.getChapters().add(c2);
pm.currentTransaction().begin();
try {
pm.makePersistent(b);
pm.currentTransaction().commit();
} finally {
if (pm.currentTransaction().isActive()) {
pm.currentTransaction().rollback();
}
}
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[appengine-java] RPC call and variables
Hello In my application, If a client A makes an rpc call and changes a variable at server, I want this change to be immediately reflected to other clients when they make same rpc call. But it looks that my clients are interacting with different servers and changes are not reflected. What can I do to make this possible? Regards Sahil --~--~-~--~~~---~--~~ 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: Fetch by string equality stopped working
Looks like a regression in handling of positional params. I could've sworn
I had tests for these.but no, they don't exist. I'll follow up with a
bug number you can use to track this issue. I'll also try to find you a
workaround.
Sorry for the trouble,
Max
On Tue, Sep 15, 2009 at 12:33 AM, damnpana...@googlemail.com
damnpana...@googlemail.com wrote:
I have a jpa/spring dao that returns a user by open id url. Running
on sdk 1.2.1, his worked without a problem. moving to 1.2.2, and now
1.2.5, it no longer returns any records. Returning all records and
using String.equals works fine:
String openIdUrl = http://blah/me;;
List results = em.createQuery(select u from +OpenIDUser.class.getName
()+ u where u.openIDUrl=?1).setParameter(1, openIdUrl).getResultList
();
//results is size 0
List l = em.createQuery(select u from +OpenIDUser.class.getName()+
u).getResultList();
for(Object o: l){
String url = ((OpenIDUser)o).getOpenIDUrl();
if(openIdUrl.equals(url)){
//string matches
return (OpenIDUser)o;
}
}
I am assuming I have inadvertently screwed something up in my
environment, but I'm struggling to get any more information - can
anyone suggest any pointers?
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[appengine-java] Re: Fetch by string equality stopped working
http://code.google.com/p/datanucleus-appengine/issues/detail?id=128
Unfortunately the only real workaround is to use named params instead of
positional params. Do you think you can make that work?
Max
On Tue, Sep 15, 2009 at 7:36 AM, Max Ross
maxr+appeng...@google.commaxr%2bappeng...@google.com
wrote:
Looks like a regression in handling of positional params. I could've sworn
I had tests for these.but no, they don't exist. I'll follow up with a
bug number you can use to track this issue. I'll also try to find you a
workaround.
Sorry for the trouble,
Max
On Tue, Sep 15, 2009 at 12:33 AM, damnpana...@googlemail.com
damnpana...@googlemail.com wrote:
I have a jpa/spring dao that returns a user by open id url. Running
on sdk 1.2.1, his worked without a problem. moving to 1.2.2, and now
1.2.5, it no longer returns any records. Returning all records and
using String.equals works fine:
String openIdUrl = http://blah/me;;
List results = em.createQuery(select u from +OpenIDUser.class.getName
()+ u where u.openIDUrl=?1).setParameter(1, openIdUrl).getResultList
();
//results is size 0
List l = em.createQuery(select u from +OpenIDUser.class.getName()+
u).getResultList();
for(Object o: l){
String url = ((OpenIDUser)o).getOpenIDUrl();
if(openIdUrl.equals(url)){
//string matches
return (OpenIDUser)o;
}
}
I am assuming I have inadvertently screwed something up in my
environment, but I'm struggling to get any more information - can
anyone suggest any pointers?
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[appengine-java] Re: Exception since upgrading to 1.2.5
I was also getting this error after upgrading to 1.2.5, except that in my case the javax.jdo.JDODetachedFieldAccessException was happening when I tried to access a simple 'com.google.appengine.api.datastore.Text' field on a Detached object (Datanucleus must be treating Enumerated fields like a Collection). I'm using JPA, so for every Text in my entities I had to add the annotation @Basic(fetch = FetchType.EAGER). Just FYI, because I'd never used a fetchtype on a non-collection field. Not sure if this is how it's supposed to work, but it fixes the issue. david On Sep 10, 1:13 am, hansamann sven.hai...@googlemail.com wrote: Hi all, since I updated my app to the latest java sdk, I sometimes see these errors (which results in the homepage of the app being blank or showing an ugly error message): [groovytweets/73.336182399219449559].stdout: StackTrace Sanitizing stacktrace: org.codehaus.groovy.runtime.InvokerInvocationException: javax.jdo.JDODetachedFieldAccessException: You have just attempted to access field retweets yet this field was not detached when you detached the object. Either dont access this field, or detach it when detaching the object. at org.codehaus.groovy.reflection.CachedMethod.invoke (CachedMethod.java:92) at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:234) at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1062) at groovy.lang.ExpandoMetaClass.invokeMethod(ExpandoMetaClass.java: 926) at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:893) at groovy.lang.Closure.call(Closure.java:279) at org.codehaus.groovy.grails.web.pages.GroovyPage.invokeTag (GroovyPage.java:219) at org.codehaus.groovy.grails.web.pages.GroovyPage$invokeTag $0.callCurrent(Unknown Source) at --~--~-~--~~~---~--~~ 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: Regarding Error in Jsp Code
It looks like there is a problem with your import statement: [javac] C:\Users\DEVELO~1.ADM\AppData\Local\Temp\Jetty_127_0_0_1_8087_war-iudaqf\jsp\org\apache\jsp\ex_jsp.java:9: cannot find symbol [javac] symbol : class query [javac] location: package javax.jdo [javac] import javax.jdo.query; [javac] I think you want to import javax.jdo.Query here (note the difference in case). As for: [javac] C:\Users\DEVELO~1.ADM\AppData\Local\Temp\Jetty_127_0_0_1_8087_war-iudaqf\jsp\org\apache\jsp\ex_jsp.java:144: cannot find symbol [javac] symbol : method getContent() [javac] location: class exe.exeEntry [javac] out.print(e.getContent()); [javac] ^ Your class exe.exeEntry does not have a method named getContent(), though it does have a field named content. You have to expose the getter/setter yourself. On Tue, Sep 15, 2009 at 3:14 AM, nimmala anukarthi nimmala.anukar...@gmail.com wrote: Hi rajeev, Thanks for your reply, i have included % % between the curly braces and compiled it again then iam getiing following error. HTTP ERROR: 500 Unable to compile class for JSP Generated servlet error: [javac] C:\Users\DEVELO~1.ADM\AppData\Local\Temp\Jetty_127_0_0_1_8087_war-iudaqf\jsp\org\apache\jsp\ex_jsp.java:9: cannot find symbol [javac] symbol : class query [javac] location: package javax.jdo [javac] import javax.jdo.query; [javac] ^ Generated servlet error: [javac] C:\Users\DEVELO~1.ADM\AppData\Local\Temp\Jetty_127_0_0_1_8087_war-iudaqf\jsp\org\apache\jsp\ex_jsp.java:116: cannot find symbol [javac] symbol : class Query [javac] location: class org.apache.jsp.ex_jsp [javac] Query query=pm.newQuery(SELECT * FROM +exeEntry.class.getName()); [javac] ^ Generated servlet error: [javac] C:\Users\DEVELO~1.ADM\AppData\Local\Temp\Jetty_127_0_0_1_8087_war-iudaqf\jsp\org\apache\jsp\ex_jsp.java:144: cannot find symbol [javac] symbol : method getContent() [javac] location: class exe.exeEntry [javac] out.print(e.getContent()); [javac] ^ Generated servlet error: [javac] C:\Users\DEVELO~1.ADM\AppData\Local\Temp\Jetty_127_0_0_1_8087_war-iudaqf\jsp\org\apache\jsp\ex_jsp.java:147: cannot find symbol [javac] symbol : method getPoster() [javac] location: class exe.exeEntry [javac] out.print(e.getPoster()); [javac] ^ Generated servlet error: [javac] Note: C:\Users\DEVELO~1.ADM\AppData\Local\Temp\Jetty_127_0_0_1_8087_war-iudaqf\jsp\org\apache\jsp\ex_jsp.java uses unchecked or unsafe operations. Generated servlet error: [javac] Note: Recompile with -Xlint:unchecked for details. [javac] 4 errors RequestURI=/ex.jsp Caused by: org.apache.jasper.JasperException: Unable to compile class for JSP Generated servlet error: [javac] C:\Users\DEVELO~1.ADM\AppData\Local\Temp\Jetty_127_0_0_1_8087_war-iudaqf\jsp\org\apache\jsp\ex_jsp.java:9: cannot find symbol [javac] symbol : class query [javac] location: package javax.jdo [javac] import javax.jdo.query; [javac] ^ Generated servlet error: [javac] C:\Users\DEVELO~1.ADM\AppData\Local\Temp\Jetty_127_0_0_1_8087_war-iudaqf\jsp\org\apache\jsp\ex_jsp.java:116: cannot find symbol [javac] symbol : class Query [javac] location: class org.apache.jsp.ex_jsp [javac] Query query=pm.newQuery(SELECT * FROM +exeEntry.class.getName()); [javac] ^ Generated servlet error: [javac] C:\Users\DEVELO~1.ADM\AppData\Local\Temp\Jetty_127_0_0_1_8087_war-iudaqf\jsp\org\apache\jsp\ex_jsp.java:144: cannot find symbol [javac] symbol : method getContent() [javac] location: class exe.exeEntry [javac] out.print(e.getContent()); [javac] ^ Generated servlet error: [javac] C:\Users\DEVELO~1.ADM\AppData\Local\Temp\Jetty_127_0_0_1_8087_war-iudaqf\jsp\org\apache\jsp\ex_jsp.java:147: cannot find symbol [javac] symbol : method getPoster() [javac] location: class exe.exeEntry [javac] out.print(e.getPoster()); [javac] ^ Generated servlet error: [javac] Note: C:\Users\DEVELO~1.ADM\AppData\Local\Temp\Jetty_127_0_0_1_8087_war-iudaqf\jsp\org\apache\jsp\ex_jsp.java uses unchecked or unsafe operations. Generated servlet error: [javac] Note: Recompile with -Xlint:unchecked for details. [javac] 4 errors at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84) at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:332) at org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:412) at org.apache.jasper.compiler.Compiler.compile(Compiler.java:472) at
[appengine-java] Re: Eclipse GWT update error
Miguel, I have now tried this - but not had any luck making it work as yet. I have downloaded and unzipped 'gwt-windows-1.6.4' - then put it into eclipse/plugins. If I try to 'Add App Engine SDK' - it just says: Failed to Initialise App Engine SDK at ./gwt-windows-1.6.4 - don't know why. One obvious thing - don't know if its significant - if you look inside the dirs for the other gwt versions installed - they have a number of things, like: appengine-sdk-plugin.jar, META-INF directory, etc as well as an appengine-java-sdk-xxx directory, but the newly downloaded/ unzipped directory only contains a 'gwt-windows-1.6.4' sub-directory. Andrew --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en -~--~~~~--~~--~--~---
[appengine-java] Problem with a query that uses Date
I have this simple query:
Query query = pm.newQuery(Contact.class);
query.setFilter(accountKey == accountKeyParam lastActionDate
lastActionDateParam);
query.declareParameters(com.google.appengine.api.datastore.Key
accountKeyParam, Date lastActionDateParam);
query.declareImports(java.util.Date);
public class Contact {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key key;
@Persistent
private Date latestActionDate;
// ...
}
When I run this query I get this exception:
javax.jdo.JDOUserException: Invalid import declaration :
java.util.Date
at
org.datanucleus.jdo.NucleusJDOHelper.getJDOExceptionForNucleusException
(NucleusJDOHelper.java:375)
at org.datanucleus.jdo.JDOQuery.execute(JDOQuery.java:275)
Any ideas why?
Thanks
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[appengine-java] Re: RPC call and variables
It is a clustered environment and you cannot assume that every request is run in the JVM. If you want to share data between requests you should persist them (data) in 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-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: Eclipse GWT update error
Hi Andrew, This is confusing, but the App Engine SDK and the GWT SDKs are separate SDKs (one does not contain the other) and they are added via separate preferences. Trying to add the GWT SDK via the App Engine preferences will fail in the manner that you described. To clarify, if you want to add a GWT SDK you need to navigate to *Window Preferences*, or *Eclipse Preferences* if you are on Mac OS X. Open the * Google* entry in the left pane and select *Web Toolkit.* On Tue, Sep 15, 2009 at 10:57 AM, AndrewG andrew.g...@rcrt.co.uk wrote: Miguel, I have now tried this - but not had any luck making it work as yet. I have downloaded and unzipped 'gwt-windows-1.6.4' - then put it into eclipse/plugins. If I try to 'Add App Engine SDK' - it just says: Failed to Initialise App Engine SDK at ./gwt-windows-1.6.4 - don't know why. One obvious thing - don't know if its significant - if you look inside the dirs for the other gwt versions installed - they have a number of things, like: appengine-sdk-plugin.jar, META-INF directory, etc as well as an appengine-java-sdk-xxx directory, but the newly downloaded/ unzipped directory only contains a 'gwt-windows-1.6.4' sub-directory. Andrew -- Miguel --~--~-~--~~~---~--~~ 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] Task Queues questions
Hi all, I'm thinking of using the Task Queue feature in order to split a particular resource consuming request which could hit the 30 secs request limits. I've got a few questions about queues (for the moment, maybe more are coming :-))... 1) is it possible to simulate a serial tasks execution? I was thinking of the following configuration for that. queue namequeue/name rate5/s/rate bucket-size1/bucket-size /queue 2) Where Can I find more information about what you call the special task scheduling parameters...?? 3) Is the quota total queue execution rate of 10/s a per queue basis quota or a global quota for all configured queues?? 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: Eclipse GWT update error
Miguel, thank you - just before I picked up yr msg I figured out that I had tried to install it in the wrong place, and tried again. I have now (re-)installed the 'web toolkit' at v1.6.4, but I haven't yet reinstalled the app engine to its previous state. With just the toolkit re-installed, I am now getting a different set of errors: Project xxx is missing required library .. com.google.appenginesdkbundle_1_2_1 where the missing jars are things like: appengine-tools-api.jar, appengine-local-runtime-shared.jar, etc'. does this mean that the gwt sdk v 1.6.4 is closely tied to the appengine vn that was broken during the upgrade? - or is something else wrong - at the moment eclipse has appengine v1.2.5 installed - prior to the upgrade it was 1.2.1. I would like to get back to the configuration that I had before the upgrade (which worked) - but the only vn that I can see on the download page is v1.2.5 - so not sure where to get the 1.2.1 version - or is this a red herring and the errors are being caused by something else ? Thank you, Andrew --~--~-~--~~~---~--~~ 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: Eclipse GWT update error
Let us know when you have something. On Tue, Sep 15, 2009 at 12:43 PM, AndrewG andrew.g...@rcrt.co.uk wrote: Miguel, I have sorted that last problem out - when I switched versions some 'phantom' jar references appeared in the build path - which I have removed. There is something else strange going on though - I will post again when I have pinned it down. Andrew -- Miguel --~--~-~--~~~---~--~~ 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: Eclipse GWT update error
Miguel, ok - I think that I am closer to the problem now. At the moment I am running the web app under tomcat 6 with the re- installed gwt 1.6.4 sdk, following the problematic upgrade. There now appears to be what looks like a classloader problem - the various servlets which this app runs cannot now be created. When the web app starts you get the 'Error loading WebAppClassLoader' message - and then 'ClassNotFoundException' for each of the servlets defined in the project - so none of the servlets work. I have checked that the entries visible in the 'Build Path' - and everything seems right. This problem appears to be isolated to the gwt project - if I create a new dynamic web project from scratch in eclipse - it runs ok - so this is not just something in the tomcat installation that has broken. Also, if I run an 'export to war' of the web app - and run it in a stand-alone tomcat web server - it seems to work. My guess is that somehow - during the upgrade something in the low- level classes which the web server has to class-load in order to create and run servlets has got broken. Unfortunately, if this assumption is right, I have no idea how to find out what the offender might be and fix it. Andrew --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Google App Engine for Java group. To post to this group, send email to google-appengine-java@googlegroups.com To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en -~--~~~~--~~--~--~---
[appengine-java] How to reset the datastore
I seem to recall this question passing through the group before. But now I cannot find the answer (if there was one) in the maillist or in documentation... I would like to purge all data from my datastore on the App Engine. (I do this locally by deleting the 2 files in /WEB-INF/appengine-generated.) Is there a way to do this in bulk? Or do I need to use the Admin Console and delete one table at a time? TIA, Steve B. --~--~-~--~~~---~--~~ 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: self referral one-to-many relationship with null root
Can someone please answer it. I appreciate it. On Sep 14, 5:09 pm, Arash aras...@gmail.com wrote: I have a class which has a collection of itself as its children. It is mapped as : @Persistent private Group parent; @Persistent(mappedBy= parent) private ListGroup children; The problem is I cannot insert the root object. The call to makePersistent comes back successfully, but the entity is not in the database. I guess this object with this mapping can not have null parents. Is there anyway I can make the parent nullable? --~--~-~--~~~---~--~~ 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] java.lang.IllegalArgumentException: id or name, but not both, must be set in each key path element
I get this exception in my application. Anybody knows what is it about ? java.lang.IllegalArgumentException: id or name, but not both, must be set in each key path element at com.google.appengine.api.datastore.DatastoreApiHelper.translateError (DatastoreApiHelper.java:29) at com.google.appengine.api.datastore.DatastoreApiHelper.makeSyncCall (DatastoreApiHelper.java:56) at com.google.appengine.api.datastore.DatastoreServiceImpl$2.run (DatastoreServiceImpl.java:170) at com.google.appengine.api.datastore.TransactionRunner.runInTransaction (TransactionRunner.java:30) at com.google.appengine.api.datastore.DatastoreServiceImpl.put (DatastoreServiceImpl.java:158) at com.google.appengine.api.datastore.DatastoreServiceImpl.put (DatastoreServiceImpl.java:138) at com.google.appengine.api.datastore.DatastoreServiceImpl.put (DatastoreServiceImpl.java:134) at com.mably.webwinewatch.model.DatastoreEntity.save (DatastoreEntity.java:84) [...] Thanx for your help. François Bordeaux, FRANCE --~--~-~--~~~---~--~~ 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: Problem with a query that uses Date
Any ideas why? In Java when you have an import statement what do you write ? Something like import java.util.Date ? so do that for JDOQL --~--~-~--~~~---~--~~ 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: ClassLoading Problems in FileUpload Servlet
Toby,
thanks for taking the time to respond, I appreciate it.
First some things I should have said before, I am using the GAE
Eclipse plug in. GWT 1.7, App Engine 1.2.5.
What I don't understand is why other test applications seem to work
quite hapilly with datastore without me adding a load of jars to the
lib area. Those other applications are using GWT and for example the
standard eclipse generated GreatingServer expanded to use
PersistenceManager seem to work just fine.
Now this may just be down to good/bad luck and the way that the google
projects are structured and therefore work with Jetty etc.
If the correct way to structure things is to explicitly put the GAE/
JDO/... jars in the war/WEB-INF/lib area should they be appearing on
the classpath of the eclipse projects? And why do some projects/use
cases (such as via GWT RCP) seem to work and others fail?
Its coming up to midnight here, so I am going to sleep and revisit
this in the morning, hopefully with a clear head I will be able to
work out what I need to do, but any input on how to set up properly is
really appreciated.
J
On Sep 15, 11:23 pm, Toby Reyelts to...@google.com wrote:
John,
The JDO/JPA support for App Engine lives entirely in userland. Like all
the other libraries under the sdk's SDK_ROOT/lib/user folder, you must
bundle it with your application in order to use it. One nice aspect about
the ORM support living in userland is that you can easily apply patches or
try new interim releases between official SDK releases.
On Tue, Sep 15, 2009 at 6:17 PM, John john.r.nic...@gmail.com wrote:
Actually I think I have simplified this further. The basic issue seems
to be referencing anything to do with the datastore from an ordinary
servlet. So if I have a servlet
import java.io.IOException;
import javax.jdo.JDOHelper;
import javax.jdo.PersistenceManagerFactory;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class UploadFileServlet extends HttpServlet {
�...@override
protected void service(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
}
private static final PersistenceManagerFactory PMF =
JDOHelper.getPersistenceManagerFactory(transactions-optional);
}
and I send it a request I get the following exception
WARNING: Nested in javax.servlet.ServletException: init:
java.lang.NoClassDefFoundError: javax/jdo/JDOHelper
at
com.cloudscapesolutions.wavacalculator.server.UploadFileServlet.clinit
(UploadFileServlet.java:18)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance
(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance
(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at java.lang.Class.newInstance0(Class.java:355)
at java.lang.Class.newInstance(Class.java:308)
at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153)
at org.mortbay.jetty.servlet.ServletHolder.getServlet
(ServletHolder.java:339)
at
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
463)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1093)
at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter
(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
at com.google.appengine.tools.development.StaticFileFilter.doFilter
(StaticFileFilter.java:121)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
at org.mortbay.jetty.servlet.ServletHandler.handle
(ServletHandler.java:360)
at org.mortbay.jetty.security.SecurityHandler.handle
(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle
(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle
(ContextHandler.java:712)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
405)
at
com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle
(DevAppEngineWebAppContext.java:54)
at org.mortbay.jetty.handler.HandlerWrapper.handle
(HandlerWrapper.java:139)
at com.google.appengine.tools.development.JettyContainerService
$ApiProxyHandler.handle(JettyContainerService.java:313)
at org.mortbay.jetty.handler.HandlerWrapper.handle
(HandlerWrapper.java:139)
at org.mortbay.jetty.Server.handle(Server.java:313)
at
[appengine-java] Re: How to grow your data model over the long term
Purely from experimenting with this (if anyone can identify a reference to a good doc that would be great) I've succeeded with the just add the new fields approach described above. The hiccups I've experienced are that you have to use nullable types for your new properties (e.g. an int won't work but an Integer will) and, if you don't implement and execute some sort of batch update-everything-to- good-non-null-defaults process queries containing the new properties won't work as you might expect. Its definitely a source of some concern for me. Looking forward to the model migration segments of the JDO/JPA Snippets That Work series here (which seem like they are important enough to promote to blog posts or the like). --~--~-~--~~~---~--~~ 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: ClassLoading Problems in FileUpload Servlet
Ok having thought about what Toby said and allied to what I knew I
went back to retest basics, which no longer worked!!! On investigation
I see that all of my projects have empty lib areas, except for gwt-
servlet.jar.
I created a new Eclipse project and sure enough it has been created
with all of the necessary jar files in the war/WEB-INF/lib area.
I can't immediately think why/how the jars have been removed from the
lib area, I am thinking it must be related to upgrading from App
Engine 1.2.2 to App Engine 1.2.5 yesterday.
Well thanks again Toby for the comments, they have helped me onto the
right path hopefully and I can continue with a clearer model of how
things are constructed.
Now sleep ... John
On Sep 15, 11:49 pm, John john.r.nic...@gmail.com wrote:
Toby,
thanks for taking the time to respond, I appreciate it.
First some things I should have said before, I am using the GAE
Eclipse plug in. GWT 1.7, App Engine 1.2.5.
What I don't understand is why other test applications seem to work
quite hapilly with datastore without me adding a load of jars to the
lib area. Those other applications are using GWT and for example the
standard eclipse generated GreatingServer expanded to use
PersistenceManager seem to work just fine.
Now this may just be down to good/bad luck and the way that the google
projects are structured and therefore work with Jetty etc.
If the correct way to structure things is to explicitly put the GAE/
JDO/... jars in the war/WEB-INF/lib area should they be appearing on
the classpath of the eclipse projects? And why do some projects/use
cases (such as via GWT RCP) seem to work and others fail?
Its coming up to midnight here, so I am going to sleep and revisit
this in the morning, hopefully with a clear head I will be able to
work out what I need to do, but any input on how to set up properly is
really appreciated.
J
On Sep 15, 11:23 pm, Toby Reyelts to...@google.com wrote:
John,
The JDO/JPA support for App Engine lives entirely in userland. Like all
the other libraries under the sdk's SDK_ROOT/lib/user folder, you must
bundle it with your application in order to use it. One nice aspect about
the ORM support living in userland is that you can easily apply patches or
try new interim releases between official SDK releases.
On Tue, Sep 15, 2009 at 6:17 PM, John john.r.nic...@gmail.com wrote:
Actually I think I have simplified this further. The basic issue seems
to be referencing anything to do with the datastore from an ordinary
servlet. So if I have a servlet
import java.io.IOException;
import javax.jdo.JDOHelper;
import javax.jdo.PersistenceManagerFactory;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class UploadFileServlet extends HttpServlet {
�...@override
protected void service(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
}
private static final PersistenceManagerFactory PMF =
JDOHelper.getPersistenceManagerFactory(transactions-optional);
}
and I send it a request I get the following exception
WARNING: Nested in javax.servlet.ServletException: init:
java.lang.NoClassDefFoundError: javax/jdo/JDOHelper
at
com.cloudscapesolutions.wavacalculator.server.UploadFileServlet.clinit
(UploadFileServlet.java:18)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance
(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance
(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at java.lang.Class.newInstance0(Class.java:355)
at java.lang.Class.newInstance(Class.java:308)
at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153)
at org.mortbay.jetty.servlet.ServletHolder.getServlet
(ServletHolder.java:339)
at
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
463)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1093)
at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter
(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
at com.google.appengine.tools.development.StaticFileFilter.doFilter
(StaticFileFilter.java:121)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
at org.mortbay.jetty.servlet.ServletHandler.handle
(ServletHandler.java:360)
at org.mortbay.jetty.security.SecurityHandler.handle
[appengine-java] Re: cron query
no... On Wed, Sep 16, 2009 at 3:47 AM, bgood ben.mcgee.g...@gmail.com wrote: Is it possible to specify the start time for a scheduled task that happens at regular intervals? For example, if I want something to happen at 12:00, 12:10, 12:20 ... (not e.g. 12:03, 12:13, 12:23...) ? 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: cron query
no... On Wed, Sep 16, 2009 at 3:47 AM, bgood ben.mcgee.g...@gmail.com wrote: Is it possible to specify the start time for a scheduled task that happens at regular intervals? For example, if I want something to happen at 12:00, 12:10, 12:20 ... (not e.g. 12:03, 12:13, 12:23...) ? 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] Accessing file from within a jar file
How do you access a file inside of a jar file in the appengine? I was able to successfully do it on my local box, but i get a FileNotFoundException while in the cloud. --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
