hasCyclicRelationships solution is merging on entities not persisted yet. This is stopping OneToOne development. org.apache.hivemind.ApplicationRuntimeException Failure invoking listener method 'public void org.trails.page.EditPage.saveAndReturn(org.apache.tapestry.IRequestCycle)' on $EditPage_68@19cec59[DefaultEdit]: cannot copy a reference to an object with a null id component: $EditPage_68@19cec59[DefaultEdit] location: context:/WEB-INF/DefaultEdit.page, line 2, column 54 1 <!DOCTYPE page-specification PUBLIC "-//Apache Software Foundation//Tapestry Specification 4.0//EN" "http://jakarta.apache.org/tapestry/dtd/Tapestry_4_0.dtd"> 2 <page-specification class="org.trails.page.EditPage"> 3 <property name="model" persist="session"/> 4 <property name="nextPage" /> 5 6 <property name="delegator"/> 7 org.hibernate.AssertionFailure cannot copy a reference to an object with a null id messages: cannot copy a reference to an object with a null id throwableCount: 1 throwables: org.hibernate.AssertionFailure: cannot copy a reference to an object with a null id Stack Trace: org.hibernate.type.EntityType.replace(EntityType.java:255) org.hibernate.type.AbstractType.replace(AbstractType.java:153) org.hibernate.type.TypeFactory.replaceAssociations(TypeFactory.java:530) org.hibernate.event.def.DefaultMergeEventListener.copyValues(DefaultMergeEventListener.java:366) org.hibernate.event.def.DefaultMergeEventListener.entityIsTransient(DefaultMergeEventListener.java:195) org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:123) org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:53) org.hibernate.impl.SessionImpl.fireMerge(SessionImpl.java:677) org.hibernate.impl.SessionImpl.merge(SessionImpl.java:661) org.hibernate.impl.SessionImpl.merge(SessionImpl.java:665) org.springframework.orm.hibernate3.HibernateTemplate$23.doInHibernate(HibernateTemplate.java:760) org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:367) org.springframework.orm.hibernate3.HibernateTemplate.merge(HibernateTemplate.java:757) org.trails.hibernate.HibernatePersistenceService.save(HibernatePersistenceService.java:124) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) java.lang.reflect.Method.invoke(Method.java:585) org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:281) org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:187) org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:154) org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:107) org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:176) org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:210) $Proxy32.save(Unknown Source) org.trails.page.EditPage.save(EditPage.java:79) org.trails.page.EditPage.saveAndReturn(EditPage.java:141) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) java.lang.reflect.Method.invoke(Method.java:585) org.apache.tapestry.listener.ListenerMethodInvokerImpl.invokeTargetMethod(ListenerMethodInvokerImpl.java:214) org.apache.tapestry.listener.ListenerMethodInvokerImpl.invokeListenerMethod(ListenerMethodInvokerImpl.java:155) org.apache.tapestry.listener.ListenerMethodInvokerImpl.searchAndInvoke(ListenerMethodInvokerImpl.java:124) org.apache.tapestry.listener.ListenerMethodInvokerImpl.invokeListenerMethod(ListenerMethodInvokerImpl.java:69) org.apache.tapestry.listener.SyntheticListener.actionTriggered(SyntheticListener.java:51) org.apache.tapestry.listener.ListenerInvokerTerminator.invokeListener(ListenerInvokerTerminator.java:51) $ListenerInvoker_111754c2134.invokeListener($ListenerInvoker_111754c2134.java) org.apache.tapestry.form.AbstractSubmit.handleClick(AbstractSubmit.java:81) org.apache.tapestry.form.AbstractSubmit.rewindFormComponent(AbstractSubmit.java:49) org.apache.tapestry.form.AbstractFormComponent.renderComponent(AbstractFormComponent.java:114) org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:617) org.apache.tapestry.AbstractComponent.renderBody(AbstractComponent.java:434) org.apache.tapestry.components.IfBean.renderComponent(IfBean.java:86) org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:617) org.apache.tapestry.AbstractComponent.renderBody(AbstractComponent.java:434) org.apache.tapestry.components.Any.renderComponent(Any.java:48) org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:617) org.apache.tapestry.BaseComponent.renderComponent(BaseComponent.java:92) org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:617) org.apache.tapestry.AbstractComponent.renderBody(AbstractComponent.java:434) org.apache.tapestry.form.FormSupportImpl.rewind(FormSupportImpl.java:573) org.apache.tapestry.form.Form.renderComponent(Form.java:226) org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:617) org.apache.tapestry.form.Form.rewind(Form.java:327) org.apache.tapestry.engine.RequestCycle.rewindForm(RequestCycle.java:439) org.apache.tapestry.form.Form.trigger(Form.java:338) org.apache.tapestry.engine.DirectService.triggerComponent(DirectService.java:146) org.apache.tapestry.engine.DirectService.service(DirectService.java:132) $IEngineService_111754c2198.service($IEngineService_111754c2198.java) org.apache.tapestry.services.impl.EngineServiceOuterProxy.service(EngineServiceOuterProxy.java:66) org.apache.tapestry.engine.AbstractEngine.service(AbstractEngine.java:248) org.apache.tapestry.services.impl.InvokeEngineTerminator.service(InvokeEngineTerminator.java:60) $WebRequestServicer_111754c216c.service($WebRequestServicer_111754c216c.java) org.trails.i18n.LocaleFilter.service(LocaleFilter.java:26) $WebRequestServicerFilter_111754c216a.service($WebRequestServicerFilter_111754c216a.java) $WebRequestServicer_111754c216e.service($WebRequestServicer_111754c216e.java) com.javaforge.tapestry.tapernate.filter.TapernateFilter.service(TapernateFilter.java:81) $WebRequestServicerFilter_111754c2168.service($WebRequestServicerFilter_111754c2168.java) $WebRequestServicer_111754c216e.service($WebRequestServicer_111754c216e.java) $WebRequestServicer_111754c2164.service($WebRequestServicer_111754c2164.java) org.apache.tapestry.services.impl.WebRequestServicerPipelineBridge.service(WebRequestServicerPipelineBridge.java:56) $ServletRequestServicer_111754c214a.service($ServletRequestServicer_111754c214a.java) org.apache.tapestry.request.DecodedRequestInjector.service(DecodedRequestInjector.java:55) $ServletRequestServicerFilter_111754c2146.service($ServletRequestServicerFilter_111754c2146.java) $ServletRequestServicer_111754c214c.service($ServletRequestServicer_111754c214c.java) org.apache.tapestry.multipart.MultipartDecoderFilter.service(MultipartDecoderFilter.java:52) $ServletRequestServicerFilter_111754c2144.service($ServletRequestServicerFilter_111754c2144.java) $ServletRequestServicer_111754c214c.service($ServletRequestServicer_111754c214c.java) org.apache.tapestry.services.impl.SetupRequestEncoding.service(SetupRequestEncoding.java:53) $ServletRequestServicerFilter_111754c2148.service($ServletRequestServicerFilter_111754c2148.java) $ServletRequestServicer_111754c214c.service($ServletRequestServicer_111754c214c.java) $ServletRequestServicer_111754c213e.service($ServletRequestServicer_111754c213e.java) org.apache.tapestry.ApplicationServlet.doService(ApplicationServlet.java:123) org.apache.tapestry.ApplicationServlet.doPost(ApplicationServlet.java:168) javax.servlet.http.HttpServlet.service(HttpServlet.java:760) javax.servlet.http.HttpServlet.service(HttpServlet.java:853) org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:491) org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1074) org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:173) org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77) org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1065) org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:365) org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:185) org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181) org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:689) org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:391) org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:146) org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114) org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139) org.mortbay.jetty.Server.handle(Server.java:285) org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:457) org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:765) org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:628) org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:203) org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:357) org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:329) org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:475)