Problem with JDO on google app engine

[Archie Sheran]

First post here I am having trouble saving an object on google app engine. Here is my POJO class:

    
package subasta.domain.users;

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 {
	@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;
	}
	
	
}

Here is my JDO Code.:

   
package subasta.repository.users;

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 Set<User> getUsers(){
		PersistenceManager pm = pmf.getPersistenceManager();
		Set<User> users = (Set<User>)pm.getManagedObjects(User.class);
		pm.close();
		return users;
	}
}

Things go wrong when making the call to makePersistent. The exception is:

   
08-sep-2009 16:51:35 com.google.appengine.repackaged.com.google.common.base.FinalizableReferenceQueue <init>
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.<init>(FinalizableReferenceQueue.java:124)
	at com.google.appengine.repackaged.com.google.common.labs.misc.InterningPools$WeakInterningPool.<clinit>(InterningPools.java:104)
	at com.google.appengine.repackaged.com.google.common.labs.misc.InterningPools.newWeakInterningPool(InterningPools.java:48)
	at com.google.appengine.repackaged.com.google.io.protocol.ProtocolSupport.<clinit>(ProtocolSupport.java:55)
	at com.google.apphosting.api.DatastorePb$PutRequest.freeze(DatastorePb.java:8452)
	at com.google.apphosting.api.DatastorePb$PutRequest$1.<init>(DatastorePb.java:8367)
	at com.google.apphosting.api.DatastorePb$PutRequest.<clinit>(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:29)
	at subasta.web.users.RegisterController.onSubmit(RegisterController.java:38)
	at org.springframework.web.servlet.mvc.SimpleFormController.onSubmit(SimpleFormController.java:409)
	at org.springframework.web.servlet.mvc.SimpleFormController.onSubmit(SimpleFormController.java:381)
	at org.springframework.web.servlet.mvc.SimpleFormController.processFormSubmission(SimpleFormController.java:267)
	at org.springframework.web.servlet.mvc.AbstractFormController.handleRequestInternal(AbstractFormController.java:265)
	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:875)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:807)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571)
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:511)
	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.<init>(Thread.java:419)
	at com.google.appengine.repackaged.com.google.common.base.internal.Finalizer.<init>(Finalizer.java:96)
	at com.google.appengine.repackaged.com.google.common.base.internal.Finalizer.startFinalizer(Finalizer.java:82)
	... 62 more

 

I have tried google and nothing. Does anybody know what Im doing wrong? Thanks.