With a fresh checkout of the Google plugins for Eclipse, my
development server (Mac Snow Leopard) is reporting:

Somehow org.datanucleus.sco.UnsetOwners.storeIntField() was called,
which should have been impossible

Anybody have any idea what this might be?

It occurs when I close the active PersistenceManager:
Home.java line 92:                      pm.close();

--
Caused by:

javax.jdo.JDOFatalInternalException: Somehow
org.datanucleus.sco.UnsetOwners.storeIntField() was called, which
should have been impossible
        at
org.datanucleus.jdo.NucleusJDOHelper.getJDOExceptionForNucleusException(NucleusJDOHelper.java:
414)
        at
org.datanucleus.jdo.JDOPersistenceManager.close(JDOPersistenceManager.java:
281)
        at org.practicezone.Home.doGet(Home.java:92)
        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:
511)
        at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1166)
        at
com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:
51)
        at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1157)
        at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:
43)
        at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1157)
        at
com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:
122)
        at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1157)
        at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:
388)
        at
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:
216)
        at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:
182)
        at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:
765)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
418)
        at
com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:
70)
        at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
152)
        at com.google.appengine.tools.development.JettyContainerService
$ApiProxyHandler.handle(JettyContainerService.java:349)
        at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
152)
        at org.mortbay.jetty.Server.handle(Server.java:326)
        at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
542)
        at org.mortbay.jetty.HttpConnection
$RequestHandler.headerComplete(HttpConnection.java:923)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
        at
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:
409)
        at org.mortbay.thread.QueuedThreadPool
$PoolThread.run(QueuedThreadPool.java:582)
NestedThrowablesStackTrace:
Somehow org.datanucleus.sco.UnsetOwners.storeIntField() was called,
which should have been impossible
org.datanucleus.exceptions.NucleusException: Somehow
org.datanucleus.sco.UnsetOwners.storeIntField() was called, which
should have been impossible
        at
org.datanucleus.store.fieldmanager.AbstractFieldManager.storeIntField(AbstractFieldManager.java:
83)
        at
org.datanucleus.state.AbstractStateManager.providedIntField(AbstractStateManager.java:
981)
        at org.practicezone.User.jdoProvideField(User.java)
        at org.practicezone.User.jdoProvideFields(User.java)
        at
org.datanucleus.state.JDOStateManagerImpl.provideFields(JDOStateManagerImpl.java:
2715)
        at
org.datanucleus.state.JDOStateManagerImpl.unsetOwnerInSCOFields(JDOStateManagerImpl.java:
4668)
        at
org.datanucleus.state.JDOStateManagerImpl.disconnect(JDOStateManagerImpl.java:
4693)
        at
org.datanucleus.ObjectManagerImpl.disconnectSMCache(ObjectManagerImpl.java:
850)
        at org.datanucleus.ObjectManagerImpl.close(ObjectManagerImpl.java:
818)
        at
org.datanucleus.jdo.JDOPersistenceManager.close(JDOPersistenceManager.java:
271)
        at org.practicezone.Home.doGet(Home.java:92)
        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:
511)
        at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1166)
        at
com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:
51)
        at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1157)
        at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:
43)
        at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1157)
        at
com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:
122)
        at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1157)
        at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:
388)
        at
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:
216)
        at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:
182)
        at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:
765)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
418)
        at
com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:
70)
        at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
152)
        at com.google.appengine.tools.development.JettyContainerService
$ApiProxyHandler.handle(JettyContainerService.java:349)
        at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
152)
        at org.mortbay.jetty.Server.handle(Server.java:326)
        at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
542)
        at org.mortbay.jetty.HttpConnection
$RequestHandler.headerComplete(HttpConnection.java:923)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
        at
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:
409)
        at org.mortbay.thread.QueuedThreadPool
$PoolThread.run(QueuedThreadPool.java:582)

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