@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Room {
private final static Logger LOG =
Logger.getLogger(Room.class.getName());
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key key;
@Persistent
private Key creatorKey;
@Persistent
private String name;
@Persistent(mappedBy = "room")
@Element(dependent = "true")
@Order(mappedBy = "lastAccessMs")
private List<Presence> presences;
...
}
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Presence {
@SuppressWarnings("unused")
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key key;
@Persistent
private Key userKey;
@SuppressWarnings("unused")
@Persistent
private Room room;
@Persistent
private long lastAccessMs = 0;
...
}
The server is running at http://localhost:8888/
java.lang.NullPointerException
at
org.datanucleus.store.appengine.DatastorePersistenceHandler.deleteObject(DatastorePersistenceHandler.java:
562)
at
org.datanucleus.store.appengine.DatastoreFKListStoreSpecialization.removeAt(DatastoreFKListStoreSpecialization.java:
144)
at
org.datanucleus.store.mapped.scostore.FKListStore.removeAt(FKListStore.java:
525)
at
org.datanucleus.store.mapped.scostore.AbstractListStore.removeAll(AbstractListStore.java:
238)
at org.datanucleus.sco.backed.List.removeAll(List.java:957)
at com.honkentuber.chat.Room.updatePresence(Room.java:98)
at
com.honkentuber.chat.ChatDatabase.storeAndFetchMessages(ChatDatabase.java:
212)
at com.honkentuber.chat.ChatServlet.newJspResponse(ChatServlet.java:
36)
at com.honkentuber.Servlet.doIt(Servlet.java:38)
at com.honkentuber.Servlet.doGet(Servlet.java:24)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:693)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
487)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1093)
at
com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:
51)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1084)
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:
70)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
139)
at com.google.appengine.tools.development.JettyContainerService
$ApiProxyHandler.handle(JettyContainerService.java:352)
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 org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
at
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:
396)
at org.mortbay.thread.BoundedThreadPool
$PoolThread.run(BoundedThreadPool.java:442)
java.lang.NullPointerException
at
org.datanucleus.store.appengine.DatastorePersistenceHandler.deleteObject(DatastorePersistenceHandler.java:
562)
at
org.datanucleus.store.appengine.DatastoreFKListStoreSpecialization.removeAt(DatastoreFKListStoreSpecialization.java:
144)
at
org.datanucleus.store.mapped.scostore.FKListStore.removeAt(FKListStore.java:
525)
at
org.datanucleus.store.mapped.scostore.AbstractListStore.removeAll(AbstractListStore.java:
238)
at org.datanucleus.sco.backed.List.removeAll(List.java:957)
at com.honkentuber.chat.Room.updatePresence(Room.java:98)
at
com.honkentuber.chat.ChatDatabase.storeAndFetchMessages(ChatDatabase.java:
212)
at com.honkentuber.chat.ChatServlet.newJspResponse(ChatServlet.java:
36)
at com.honkentuber.Servlet.doIt(Servlet.java:38)
at com.honkentuber.Servlet.doGet(Servlet.java:24)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:693)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
487)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1093)
at
com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:
51)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1084)
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:
70)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
139)
at com.google.appengine.tools.development.JettyContainerService
$ApiProxyHandler.handle(JettyContainerService.java:352)
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 org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
at
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:
396)
at org.mortbay.thread.BoundedThreadPool
$PoolThread.run(BoundedThreadPool.java:442)
On Mar 14, 10:02 pm, "Max Ross (Google)" <[email protected]>
wrote:
> Please post your model object definitions and the stack trace.
>
> Thanks!
> Max
>
>
>
> On Sun, Mar 14, 2010 at 8:51 PM, Philip Tucker <[email protected]> wrote:
> > If I annotate a dependent 1:many relationship with @Order(mappedBy =
> > "foo"), I get a NPE when I try to remove something from the list. When
> > I remove the annotation everything works fine. Is this a known
> > limitation? If not I can post a stack trace and more details.
>
> > --
> > 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
> > [email protected].
> > To unsubscribe from this group, send email to
> > [email protected]<google-appengine-java%2B
> > [email protected]>
> > .
> > For more options, visit this group at
> >http://groups.google.com/group/google-appengine-java?hl=en.
--
You received this message because you are subscribed to the Google Groups
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