If you replace the list list string with of list string does it work? If so then the list list is probably the problem, in this case why not encapsulate a list of string into its own class.
On Feb 20, 1:35 pm, Henning <[email protected]> wrote: > Hello, > > I have a class MainConfiguration I want do be persisted. In this class > there is a property of type > > @Persistent private List<List<String>> engRegKeyCustom; > > If I try to search for a MainConfiguration entity or if I try to > persist one I get the following error... Is this because of my > List<List... variables ?? > > WARNING: Nested in java.lang.ExceptionInInitializerError: > java.lang.NullPointerException > at > org.datanucleus.store.appengine.jdo.DatastoreJDOMetaDataManager.shouldBeInD > efaultFetchGroup(DatastoreJDOMetaDataManager.java: > 167) > at > org.datanucleus.store.appengine.jdo.DatastoreJDOMetaDataManager.shouldBeInD > efaultFetchGroup(DatastoreJDOMetaDataManager.java: > 167) > at > org.datanucleus.store.appengine.jdo.DatastoreJDOMetaDataManager.populateAbs > tractClassMetaData(DatastoreJDOMetaDataManager.java: > 153) > at > org.datanucleus.metadata.MetaDataManager.populateFileMetaData(MetaDataManag > er.java: > 2148) > at > org.datanucleus.metadata.MetaDataManager.loadAnnotationsForClass(MetaDataMa > nager.java: > 2289) > at > org.datanucleus.jdo.metadata.JDOMetaDataManager.getMetaDataForClassInternal > (JDOMetaDataManager.java: > 369) > at org.datanucleus.jdo.metadata.JDOMetaDataManager > $MetaDataRegisterClassListener.registerClass(JDOMetaDataManager.java: > 184) > at javax.jdo.spi.JDOImplHelper.registerClass(JDOImplHelper.java:376) > at > persistenz.entities.MainConfiguration.<clinit>(MainConfiguration.java) > at test.DefaultData.doGet(DefaultData.java:45) > 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(ServeBlobFi > lter.java: > 51) > at org.mortbay.jetty.servlet.ServletHandler > $CachedChain.doFilter(ServletHandler.java:1084) > at > com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(Trans > actionCleanupFilter.java: > 43) > at org.mortbay.jetty.servlet.ServletHandler > $CachedChain.doFilter(ServletHandler.java:1084) > at > com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFile > Filter.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(DevAppEn > gineWebAppContext.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) -- 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]. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
