I was getting the following exception in google app engine. After you get it I strongly suggest looking into a file in your project local_db.bin beyond all the garbage you most probably will be able to see what you have tried to save and if you are not able to see it when querying it is a problem with the way you are trying to query your object because the exception does not affect makingpersistent. After the exception I have posted a class of my own as an example:
INFO: Failed to start reference finalizer thread. Reference cleanup will only occur when new references are created.
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.google.appengine.repackaged.com.google.common.base.FinalizableReferenceQueue.(FinalizableReferenceQueue.java:124)
at com.google.appengine.repackaged.com.google.common.labs.misc.InterningPools$WeakInterningPool.(InterningPools.java:104)
at com.google.appengine.repackaged.com.google.common.labs.misc.InterningPools.newWeakInterningPool(InterningPools.java:48)
at com.google.appengine.repackaged.com.google.io.protocol.ProtocolSupport.(ProtocolSupport.java:55)
at com.google.apphosting.api.DatastorePb$PutRequest.freeze(DatastorePb.java:8452)
at com.google.apphosting.api.DatastorePb$PutRequest$1.(DatastorePb.java:8367)
at com.google.apphosting.api.DatastorePb$PutRequest.(DatastorePb.java:8364)
at com.google.appengine.api.datastore.DatastoreServiceImpl.put(DatastoreServiceImpl.java:152)
at com.google.appengine.api.datastore.DatastoreServiceImpl.put(DatastoreServiceImpl.java:138)
at com.google.appengine.api.datastore.DatastoreServiceImpl.put(DatastoreServiceImpl.java:130)
at org.datanucleus.store.appengine.RuntimeExceptionWrappingDatastoreService.put(RuntimeExceptionWrappingDatastoreService.java:93)
at org.datanucleus.store.appengine.DatastorePersistenceHandler.put(DatastorePersistenceHandler.java:165)
at org.datanucleus.store.appengine.DatastorePersistenceHandler.put(DatastorePersistenceHandler.java:112)
at org.datanucleus.store.appengine.DatastorePersistenceHandler.insertObjects(DatastorePersistenceHandler.java:239)
at org.datanucleus.store.appengine.DatastorePersistenceHandler.insertObject(DatastorePersistenceHandler.java:225)
at org.datanucleus.state.JDOStateManagerImpl.internalMakePersistent(JDOStateManagerImpl.java:3185)
at org.datanucleus.state.JDOStateManagerImpl.makePersistent(JDOStateManagerImpl.java:3161)
at org.datanucleus.ObjectManagerImpl.persistObjectInternal(ObjectManagerImpl.java:1298)
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 subasta.repository.users.JDOUserDAO.saveUser(JDOUserDAO.java:30)
at subasta.web.users.RegisterController.onSubmit(RegisterController.java:38)
at org.springframework.web.servlet.mvc.SimpleFormController.onSubmit(SimpleFormController.java:415)
at org.springframework.web.servlet.mvc.SimpleFormController.onSubmit(SimpleFormController.java:387)
at org.springframework.web.servlet.mvc.SimpleFormController.processFormSubmission(SimpleFormController.java:272)
at org.springframework.web.servlet.mvc.AbstractFormController.handleRequestInternal(AbstractFormController.java:268)
at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:766)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:712)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:636)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:556)
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 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 org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:506)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:844)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:644)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:205)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:396)
at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:442)
Caused by: java.security.AccessControlException: access denied (java.lang.RuntimePermission modifyThreadGroup)
at java.security.AccessControlContext.checkPermission(AccessControlContext.java:323)
at java.security.AccessController.checkPermission(AccessController.java:546)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
at com.google.appengine.tools.development.DevAppServerFactory$CustomSecurityManager.checkPermission(DevAppServerFactory.java:139)
at com.google.appengine.tools.development.DevAppServerFactory$CustomSecurityManager.checkAccess(DevAppServerFactory.java:166)
at java.lang.ThreadGroup.checkAccess(ThreadGroup.java:288)
at java.lang.Thread.init(Thread.java:332)
at java.lang.Thread.(Thread.java:419)
at com.google.appengine.repackaged.com.google.common.base.internal.Finalizer.(Finalizer.java:96)
at com.google.appengine.repackaged.com.google.common.base.internal.Finalizer.startFinalizer(Finalizer.java:82)
... 62 more
<------------------------------------------------------------------------------------------------------------------------------------------------------------------------------>
package subasta.domain.users;
import java.io.Serializable;
import javax.jdo.annotations.IdentityType;
import javax.jdo.annotations.PersistenceCapable;
import javax.jdo.annotations.PrimaryKey;
import javax.jdo.annotations.Persistent;
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class User implements Serializable{
private static final long serialVersionUID = 2L;
@PrimaryKey
@Persistent
private String nombre;
public User(String nombre){
this.nombre = nombre;
}
public String getNombre() {
return nombre;
}
public void setNombre(String nombre) {
this.nombre = nombre;
}
}
<------------------------------------------------------------------------------------------------------------------------------------------------------------------------------>
package subasta.repository.users;
import java.util.List;
import java.util.Set;
import java.util.logging.Logger;
import javax.jdo.JDOHelper;
import javax.jdo.PersistenceManagerFactory;
import javax.jdo.PersistenceManager;
import subasta.domain.users.User;
public class JDOUserDAO implements UserDAO{
/** Logger for this class and subclasses */
private static final Logger log = Logger.getLogger(UserDAO.class
.getName());
private static final PersistenceManagerFactory pmf =
JDOHelper.getPersistenceManagerFactory("transactions-optional");
//PersistenceManagerFactory pmf;
//public void setPmf(PersistenceManagerFactory pmf) {
//this.pmf = pmf;
//}
public void saveUser(User user){
PersistenceManager pm = pmf.getPersistenceManager();
try{
pm.makePersistent(user);
}finally {
pm.close();
}
}
@SuppressWarnings("unchecked")
public List getUsers(){
PersistenceManager pm = pmf.getPersistenceManager();
String query = "select from " + User.class.getName();
return (List) pm.newQuery(query).execute();
}
}