"com.google.appengine.api.datastore.Key:Categories(76)" is what's
returned on the insert:
Categories category = new Categories(user.getNickname(), account,
categoryName);
pm.makePersistent(category);
Object o = JDOHelper.getObjectId(category);
System.out.println(o.toString());
This is what's returned when doing the delete:
Dec 4, 2009 12:57:54 PM org.datanucleus.jdo.JDOAdapter
getNewSingleFieldIdentity
SEVERE: Error encountered while creating SingleFieldIdentity instance
of type "javax.jdo.identity.ObjectIdentity"
Dec 4, 2009 12:57:54 PM org.datanucleus.jdo.JDOAdapter
getNewSingleFieldIdentity
SEVERE: java.lang.reflect.InvocationTargetException
Dec 4, 2009 12:57:54 PM com.google.apphosting.utils.jetty.JettyLogger
warn
WARNING: /categories
java.lang.NullPointerException
at ma.CategoriesServlet.doPost(CategoriesServlet.java:61)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
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$CachedChain.doFilter
(ServletHandler.java:1093)
at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter
(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$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
$ApiProxyHandler.handle(JettyContainerService.java:306)
at org.mortbay.jetty.handler.HandlerWrapper.handle
(HandlerWrapper.java:139)
at org.mortbay.jetty.Server.handle(Server.java:313)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
506)
at org.mortbay.jetty.HttpConnection$RequestHandler.content
(HttpConnection.java:844)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:644)
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)
Which log are you referring to? Can you point me to where it would be
on my computer?
On Dec 3, 7:36 am, datanucleus <[email protected]> wrote:
> > This is strange - when I retrieve the object after persisting via
> > "JDOHelper.getObjectId(obj)", I get an object back no problem.
>
> Yes, but you haven't told us what is the "id" returned by that method.
> And whats in the log when you invoke that pm.getObjectById ... ?
>
> > Then,before trying to delete the object, I do "pm.newObjectIdInstance
> > (Categories.class, key)" and I get a NullPointerException.
>
> Perhaps if you post the actual exception and stack trace, cos without
> it it means very little.
> ANd whats in the log ?
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