I have this exact same problem. So, +1. Temporary workaround? Should we just omit parent reference in child for now?
On Nov 23, 2:15 pm, "Max Ross (Google)" <[email protected]> wrote: > Thanks for the report! I've made a lot of fixes since the RC1 build but > they're not backwards-compatible with the 1.2.6 SDK, so unfortunately I > can't release them until the next SDK is out. Your test case works for me > with my latest build so this will behave correctly in the next release. > > Thanks, > Max > > On Mon, Nov 23, 2009 at 1:56 PM, R. A. <[email protected]> wrote: > > >http://datanucleus-appengine.googlecode.com/files/appengine-orm-1.0.4... > > >> This release provides support for inheritance of native datastore types > > and embedded classes. > > > Can't get inheritance to run. Tested on *-1.0.3 and *-1.0.4.RC1. > > Without AbstractEntity, 2 entities with OneToMany relationship works > > perfectly. Is it the problem with Key id type? NullPointerException > > is thrown when i access child list element: > > > public void test() { > > List<ParentEntity> parents = tdao.load(); > > for (ParentEntity pe : parents) { > > List<ChildEntity> childs = pe.getChilds(); > > System.out.println(".. childs.size: " + childs.size()); > > for(ChildEntity ce : childs) { // <----- NPE > > } > > } > > } > > > @Entity > > @MappedSuperclass > > public abstract class AbstractEntity { > > > �...@id > > �...@generatedvalue(strategy = GenerationType.IDENTITY) > > private Key id; > > > private String name; > > ... > > } > > > @Entity > > public class ParentEntity extends AbstractEntity { > > > �...@onetomany(mappedBy="parent", cascade=CascadeType.ALL) > > private List<ChildEntity> childs; > > ... > > } > > > @Entity > > public class ChildEntity extends AbstractEntity { > > > private Long value; > > > �...@manytoone > > private ParentEntity parent; > > ... > > } > > > Nov 23, 2009 8:20:34 PM com.google.apphosting.utils.jetty.JettyLogger > > warn > > WARNING: Nested in > > org.springframework.web.util.NestedServletException: Request > > processing failed; nested exception is java.lang.NullPointerException: > > java.lang.NullPointerException > > at > > > org.datanucleus.store.mapped.mapping.PersistenceCapableMapping.getObjectForApplicationIdentity > > (PersistenceCapableMapping.java:971) > > at > > org.datanucleus.store.mapped.mapping.PersistenceCapableMapping.getObject > > (PersistenceCapableMapping.java:720) > > at > > org.datanucleus.store.appengine.DatastoreRelationFieldManager.lookupParent > > (DatastoreRelationFieldManager.java:309) > > at > > > org.datanucleus.store.appengine.DatastoreRelationFieldManager.fetchRelationField > > (DatastoreRelationFieldManager.java:289) > > at > > org.datanucleus.store.appengine.DatastoreFieldManager.fetchObjectField > > (DatastoreFieldManager.java:271) > > at org.datanucleus.state.AbstractStateManager.replacingObjectField > > (AbstractStateManager.java:1197) > > at gae.test.ChildEntity.jdoReplaceField(ChildEntity.java) > > at gae.test.AbstractEntity.jdoReplaceFields(AbstractEntity.java) > > at org.datanucleus.state.JDOStateManagerImpl.replaceFields > > (JDOStateManagerImpl.java:2772) > > at org.datanucleus.state.JDOStateManagerImpl.replaceFields > > (JDOStateManagerImpl.java:2791) > > at > > org.datanucleus.store.appengine.DatastorePersistenceHandler.fetchObject > > (DatastorePersistenceHandler.java:443) > > at org.datanucleus.store.appengine.query.DatastoreQuery.entityToPojo > > (DatastoreQuery.java:433) > > at > > > org.datanucleus.store.appengine.DatastoreElementContainerStoreSpecialization.getChildren > > (DatastoreElementContainerStoreSpecialization.java:103) > > at org.datanucleus.store.appengine.DatastoreFKListStore.listIterator > > (DatastoreFKListStore.java:47) > > at > > org.datanucleus.store.mapped.scostore.AbstractListStore.listIterator > > (AbstractListStore.java:84) > > at org.datanucleus.store.mapped.scostore.AbstractListStore.iterator > > (AbstractListStore.java:74) > > at org.datanucleus.sco.backed.List.loadFromStore(List.java:241) > > at org.datanucleus.sco.backed.List.iterator(List.java:507) > > at > > java.util.AbstractCollection.toString(AbstractCollection.java:414) > > at java.lang.String.valueOf(String.java:2826) > > at java.lang.StringBuilder.append(StringBuilder.java:115) > > at gae.test.TestServiceImpl.openParentsWithChilds > > (TestServiceImpl.java:27) > > 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.tools.development.agent.runtime.Runtime.invoke > > (Runtime.java:100) > > at > > org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection > > (AopUtils.java:307) > > at > > > org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint > > (ReflectiveMethodInvocation.java:183) > > at > > org.springframework.aop.framework.ReflectiveMethodInvocation.proceed > > (ReflectiveMethodInvocation.java:150) > > at > > org.springframework.transaction.interceptor.TransactionInterceptor.invoke > > (TransactionInterceptor.java:107) > > at > > org.springframework.aop.framework.ReflectiveMethodInvocation.proceed > > (ReflectiveMethodInvocation.java:172) > > at org.springframework.aop.framework.JdkDynamicAopProxy.invoke > > (JdkDynamicAopProxy.java:202) > > at $Proxy28.openParentsWithChilds(Unknown Source) > > at gae.test.TestController.test(TestController.java:17) > > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > > at sun.reflect.NativeMethodAccessorImpl.invoke > > (NativeMethodAccessorImpl.java:39) > > at sun.reflect.DelegatingMethodAccessorImpl.invoke > > (DelegatingMethodAccessorImpl.java:25) > > at java.lang.reflect.Method.invoke(Method.java:597) > > at > > com.google.appengine.tools.development.agent.runtime.Runtime.invoke > > (Runtime.java:100) > > at > > > org.springframework.web.bind.annotation.support.HandlerMethodInvoker.doInvokeMethod > > (HandlerMethodInvoker.java:654) > > at > > > org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod > > (HandlerMethodInvoker.java:160) > > at > > > org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod > > (AnnotationMethodHandlerAdapter.java:378) > > at > > > org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle > > (AnnotationMethodHandlerAdapter.java:366) > > at org.springframework.web.servlet.DispatcherServlet.doDispatch > > (DispatcherServlet.java:781) > > at org.springframework.web.servlet.DispatcherServlet.doService > > (DispatcherServlet.java:726) > > at org.springframework.web.servlet.FrameworkServlet.processRequest > > (FrameworkServlet.java:636) > > at org.springframework.web.servlet.FrameworkServlet.doGet > > (FrameworkServlet.java:545) > > at javax.servlet.http.HttpServlet.service(HttpServlet.java:693) > > at javax.servlet.http.HttpServlet.service(HttpServlet.java:806) > > at > > org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java: > > 487) > > at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter > > (ServletHandler.java:1093) > > at > > com.google.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 > > $ApiProxyHandler.handle(JettyContainerService.java:342) > > at org.mortbay.jetty.handler.HandlerWrapper.handle > > (HandlerWrapper.java:139) > > at org.mortbay.jetty.Server.handle(Server.java:313) > > at > > org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java: > > 506) > > at org.mortbay.jetty.HttpConnection$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) > > Nov 23, 2009 8:20:34 PM com.google.apphosting.utils.jetty.JettyLogger > > warn > > > -- > > > 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]<google-appengine-java%[email protected]> > > . > > For more options, visit this group at > > ... > > read more » -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. 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