Which suggests that container is null. Presumably you have:
@javax.inject.Inject private DomainObjectContainer container; is the @Inject annotation present? If so, then it suggests that the object is being instantiated "outside of" Isis (ie using new()) without giving the framework the chance to inject the domain services. I suggest putting a break point in the no-arg constructor of this class to see what the stack trace, ie how is it being instantiated. On Tue, 28 Aug 2018 at 23:04 Aída Betzabeth Dávila Sotelo < aida.dav...@vortech-it.com> wrote: > Hi! > > > The line 749, It's the first line of the delete method. > > > public List<UserSubscription> delete() { > final String title = container.titleOf(this); > final List<UserSubscription> returnList = null; > container.removeIfNotAlready(this); > container.informUser( > TranslatableString.tr("Deleted {title}", "title", title), > this.getClass(), "delete"); > > return returnList; > } > //endregion > > > ________________________________ > De: Dan Haywood <d...@haywood-associates.co.uk> > Enviado: martes, 28 de agosto de 2018 01:44 p. m. > Para: users@isis.apache.org > Asunto: Re: Delete Error > > At the end of that stack trace I see: > > Caused by: > * > * java.lang.NullPointerException > * > * > > domainapp.dom.simple.users.UserSubscription#delete(UserSubscription.java:749) > > > Which line is 749? > > > On Tue, 28 Aug 2018, 20:14 Aída Betzabeth Dávila Sotelo, < > aida.dav...@vortech-it.com> wrote: > > > Hi, > > > > I have the following method to delete an element of a class. > > > > > > //region > delete (events) > > public List<UserSubscription> delete() { > > > > final String title = container.titleOf(this); > > final List<UserSubscription> returnList = null; > > container.removeIfNotAlready(this); > > container.informUser( > > TranslatableString.tr("Deleted {title}", "title", title), > > this.getClass(), "delete"); > > > > return returnList; > > } > > //endregion > > > > However, it started to fail and sent me the following error: Could you > > help me, what is causing it? or what can I check to remove it? > > > > Aída > > > > Stack trace: > > > > * org.apache.wicket.WicketRuntimeException > > * Method onRequest of interface > > org.apache.wicket.behavior.IBehaviorListener targeted at > > org.apache.wicket.ajax.markup.html.AjaxLink$1@5872c215 on component > > [AjaxLink [Component id = additionalLink]] threw an exception > > * > > > org.apache.wicket.RequestListenerInterface#internalInvoke(RequestListenerInterface.java:268) > > * > > > org.apache.wicket.RequestListenerInterface#invoke(RequestListenerInterface.java:241) > > * > > > org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler#invokeListener(ListenerInterfaceRequestHandler.java:250) > > * > > > org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler#respond(ListenerInterfaceRequestHandler.java:236) > > * > > > org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor#respond(RequestCycle.java:890) > > * > > > org.apache.wicket.request.RequestHandlerStack#execute(RequestHandlerStack.java:64) > > * > > > org.apache.wicket.request.cycle.RequestCycle#execute(RequestCycle.java:261) > > * > > > org.apache.wicket.request.cycle.RequestCycle#processRequest(RequestCycle.java:218) > > * > > > org.apache.wicket.request.cycle.RequestCycle#processRequestAndDetach(RequestCycle.java:289) > > * > > > org.apache.wicket.protocol.http.WicketFilter#processRequestCycle(WicketFilter.java:259) > > * > > > org.apache.wicket.protocol.http.WicketFilter#processRequest(WicketFilter.java:201) > > * > > > org.apache.wicket.protocol.http.WicketFilter#doFilter(WicketFilter.java:282) > > * > > > org.eclipse.jetty.servlet.ServletHandler$CachedChain#doFilter(ServletHandler.java:1668) > > * > > > org.apache.isis.core.webapp.diagnostics.IsisLogOnExceptionFilter#doFilter(IsisLogOnExceptionFilter.java:52) > > * > > > org.eclipse.jetty.servlet.ServletHandler$CachedChain#doFilter(ServletHandler.java:1668) > > * > > > org.apache.shiro.web.servlet.AbstractShiroFilter#executeChain(AbstractShiroFilter.java:449) > > * > > > org.apache.shiro.web.servlet.AbstractShiroFilter$1#call(AbstractShiroFilter.java:365) > > * > > > org.apache.shiro.subject.support.SubjectCallable#doCall(SubjectCallable.java:90) > > * > > > org.apache.shiro.subject.support.SubjectCallable#call(SubjectCallable.java:83) > > * > > > org.apache.shiro.subject.support.DelegatingSubject#execute(DelegatingSubject.java:383) > > * > > > org.apache.shiro.web.servlet.AbstractShiroFilter#doFilterInternal(AbstractShiroFilter.java:362) > > * > > > org.apache.shiro.web.servlet.OncePerRequestFilter#doFilter(OncePerRequestFilter.java:125) > > * > > > org.eclipse.jetty.servlet.ServletHandler$CachedChain#doFilter(ServletHandler.java:1668) > > * > > > org.eclipse.jetty.servlet.ServletHandler#doHandle(ServletHandler.java:581) > > * > > > org.eclipse.jetty.server.handler.ScopedHandler#handle(ScopedHandler.java:143) > > * > > > org.eclipse.jetty.security.SecurityHandler#handle(SecurityHandler.java:548) > > * > > > org.eclipse.jetty.server.session.SessionHandler#doHandle(SessionHandler.java:226) > > * > > > org.eclipse.jetty.server.handler.ContextHandler#doHandle(ContextHandler.java:1158) > > * > > > org.eclipse.jetty.servlet.ServletHandler#doScope(ServletHandler.java:511) > > * > > > org.eclipse.jetty.server.session.SessionHandler#doScope(SessionHandler.java:185) > > * > > > org.eclipse.jetty.server.handler.ContextHandler#doScope(ContextHandler.java:1090) > > * > > > org.eclipse.jetty.server.handler.ScopedHandler#handle(ScopedHandler.java:141) > > * > > > org.eclipse.jetty.server.handler.HandlerWrapper#handle(HandlerWrapper.java:119) > > * org.eclipse.jetty.server.Server#handle(Server.java:517) > > * org.eclipse.jetty.server.HttpChannel#handle(HttpChannel.java:308) > > * > > > org.eclipse.jetty.server.HttpConnection#onFillable(HttpConnection.java:242) > > * org.eclipse.jetty.io > > .AbstractConnection$ReadCallback#succeeded(AbstractConnection.java:261) > > * org.eclipse.jetty.io.FillInterest#fillable(FillInterest.java:95) > > * org.eclipse.jetty.io > > .SelectChannelEndPoint$2#run(SelectChannelEndPoint.java:75) > > * > > > org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume#produceAndRun(ExecuteProduceConsume.java:213) > > * > > > org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume#run(ExecuteProduceConsume.java:147) > > * > > > org.eclipse.jetty.util.thread.QueuedThreadPool#runJob(QueuedThreadPool.java:654) > > * > > > org.eclipse.jetty.util.thread.QueuedThreadPool$3#run(QueuedThreadPool.java:572) > > * java.lang.Thread#run(Thread.java:748) > > * > > * Caused by: > > * > > * java.lang.reflect.InvocationTargetException > > * > > * > > > sun.reflect.NativeMethodAccessorImpl#invoke0(NativeMethodAccessorImpl.java:-2) > > * > > > sun.reflect.NativeMethodAccessorImpl#invoke(NativeMethodAccessorImpl.java:62) > > * > > > sun.reflect.DelegatingMethodAccessorImpl#invoke(DelegatingMethodAccessorImpl.java:43) > > * java.lang.reflect.Method#invoke(Method.java:498) > > * > > > org.apache.wicket.RequestListenerInterface#internalInvoke(RequestListenerInterface.java:258) > > * > > > org.apache.wicket.RequestListenerInterface#invoke(RequestListenerInterface.java:241) > > * > > > org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler#invokeListener(ListenerInterfaceRequestHandler.java:250) > > * > > > org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler#respond(ListenerInterfaceRequestHandler.java:236) > > * > > > org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor#respond(RequestCycle.java:890) > > * > > > org.apache.wicket.request.RequestHandlerStack#execute(RequestHandlerStack.java:64) > > * > > > org.apache.wicket.request.cycle.RequestCycle#execute(RequestCycle.java:261) > > * > > > org.apache.wicket.request.cycle.RequestCycle#processRequest(RequestCycle.java:218) > > * > > > org.apache.wicket.request.cycle.RequestCycle#processRequestAndDetach(RequestCycle.java:289) > > * > > > org.apache.wicket.protocol.http.WicketFilter#processRequestCycle(WicketFilter.java:259) > > * > > > org.apache.wicket.protocol.http.WicketFilter#processRequest(WicketFilter.java:201) > > * > > > org.apache.wicket.protocol.http.WicketFilter#doFilter(WicketFilter.java:282) > > * > > > org.eclipse.jetty.servlet.ServletHandler$CachedChain#doFilter(ServletHandler.java:1668) > > * > > > org.apache.isis.core.webapp.diagnostics.IsisLogOnExceptionFilter#doFilter(IsisLogOnExceptionFilter.java:52) > > * > > > org.eclipse.jetty.servlet.ServletHandler$CachedChain#doFilter(ServletHandler.java:1668) > > * > > > org.apache.shiro.web.servlet.AbstractShiroFilter#executeChain(AbstractShiroFilter.java:449) > > * > > > org.apache.shiro.web.servlet.AbstractShiroFilter$1#call(AbstractShiroFilter.java:365) > > * > > > org.apache.shiro.subject.support.SubjectCallable#doCall(SubjectCallable.java:90) > > * > > > org.apache.shiro.subject.support.SubjectCallable#call(SubjectCallable.java:83) > > * > > > org.apache.shiro.subject.support.DelegatingSubject#execute(DelegatingSubject.java:383) > > * > > > org.apache.shiro.web.servlet.AbstractShiroFilter#doFilterInternal(AbstractShiroFilter.java:362) > > * > > > org.apache.shiro.web.servlet.OncePerRequestFilter#doFilter(OncePerRequestFilter.java:125) > > * > > > org.eclipse.jetty.servlet.ServletHandler$CachedChain#doFilter(ServletHandler.java:1668) > > * > > > org.eclipse.jetty.servlet.ServletHandler#doHandle(ServletHandler.java:581) > > * > > > org.eclipse.jetty.server.handler.ScopedHandler#handle(ScopedHandler.java:143) > > * > > > org.eclipse.jetty.security.SecurityHandler#handle(SecurityHandler.java:548) > > * > > > org.eclipse.jetty.server.session.SessionHandler#doHandle(SessionHandler.java:226) > > * > > > org.eclipse.jetty.server.handler.ContextHandler#doHandle(ContextHandler.java:1158) > > * > > > org.eclipse.jetty.servlet.ServletHandler#doScope(ServletHandler.java:511) > > * > > > org.eclipse.jetty.server.session.SessionHandler#doScope(SessionHandler.java:185) > > * > > > org.eclipse.jetty.server.handler.ContextHandler#doScope(ContextHandler.java:1090) > > * > > > org.eclipse.jetty.server.handler.ScopedHandler#handle(ScopedHandler.java:141) > > * > > > org.eclipse.jetty.server.handler.HandlerWrapper#handle(HandlerWrapper.java:119) > > * org.eclipse.jetty.server.Server#handle(Server.java:517) > > * org.eclipse.jetty.server.HttpChannel#handle(HttpChannel.java:308) > > * > > > org.eclipse.jetty.server.HttpConnection#onFillable(HttpConnection.java:242) > > * org.eclipse.jetty.io > > .AbstractConnection$ReadCallback#succeeded(AbstractConnection.java:261) > > * org.eclipse.jetty.io.FillInterest#fillable(FillInterest.java:95) > > * org.eclipse.jetty.io > > .SelectChannelEndPoint$2#run(SelectChannelEndPoint.java:75) > > * > > > org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume#produceAndRun(ExecuteProduceConsume.java:213) > > * > > > org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume#run(ExecuteProduceConsume.java:147) > > * > > > org.eclipse.jetty.util.thread.QueuedThreadPool#runJob(QueuedThreadPool.java:654) > > * > > > org.eclipse.jetty.util.thread.QueuedThreadPool$3#run(QueuedThreadPool.java:572) > > * java.lang.Thread#run(Thread.java:748) > > * > > * Caused by: > > * > > * java.lang.NullPointerException > > * > > * > > > domainapp.dom.simple.users.UserSubscription#delete(UserSubscription.java:749) > > * > > > sun.reflect.NativeMethodAccessorImpl#invoke0(NativeMethodAccessorImpl.java:-2) > > * > > > sun.reflect.NativeMethodAccessorImpl#invoke(NativeMethodAccessorImpl.java:62) > > * > > > sun.reflect.DelegatingMethodAccessorImpl#invoke(DelegatingMethodAccessorImpl.java:43) > > * java.lang.reflect.Method#invoke(Method.java:498) > > * > > > org.apache.isis.core.metamodel.facets.actions.action.invocation.ActionInvocationFacetForDomainEventAbstract#invokeMethodElseFromCache(ActionInvocationFacetForDomainEventAbstract.java:408) > > * > > > org.apache.isis.core.metamodel.facets.actions.action.invocation.ActionInvocationFacetForDomainEventAbstract$2#execute(ActionInvocationFacetForDomainEventAbstract.java:262) > > * > > > org.apache.isis.core.metamodel.facets.actions.action.invocation.ActionInvocationFacetForDomainEventAbstract$2#execute(ActionInvocationFacetForDomainEventAbstract.java:223) > > * > > > org.apache.isis.applib.services.iactn.Interaction#executeInternal(Interaction.java:173) > > * > > > org.apache.isis.applib.services.iactn.Interaction#execute(Interaction.java:143) > > * > > > org.apache.isis.core.metamodel.facets.actions.action.invocation.ActionInvocationFacetForDomainEventAbstract#doInvoke(ActionInvocationFacetForDomainEventAbstract.java:311) > > * > > > org.apache.isis.core.metamodel.facets.actions.action.invocation.ActionInvocationFacetForDomainEventAbstract$1#execute(ActionInvocationFacetForDomainEventAbstract.java:165) > > * > > > org.apache.isis.core.runtime.system.transaction.IsisTransactionManager#executeWithinTransaction(IsisTransactionManager.java:143) > > * > > > org.apache.isis.core.runtime.system.transaction.IsisTransactionManager#executeWithinTransaction(IsisTransactionManager.java:133) > > * > > > org.apache.isis.core.runtime.services.persistsession.PersistenceSessionServiceInternalDefault#executeWithinTransaction(PersistenceSessionServiceInternalDefault.java:179) > > * > > > org.apache.isis.core.metamodel.facets.actions.action.invocation.ActionInvocationFacetForDomainEventAbstract#invoke(ActionInvocationFacetForDomainEventAbstract.java:161) > > * > > > org.apache.isis.core.metamodel.specloader.specimpl.ObjectActionDefault#executeInternal(ObjectActionDefault.java:398) > > * > > > org.apache.isis.core.metamodel.specloader.specimpl.ObjectActionDefault#execute(ObjectActionDefault.java:387) > > * > > > org.apache.isis.core.metamodel.specloader.specimpl.ObjectActionDefault#executeWithRuleChecking(ObjectActionDefault.java:368) > > * > > > org.apache.isis.viewer.wicket.model.models.ActionModel#executeAction(ActionModel.java:483) > > * > > > org.apache.isis.viewer.wicket.model.models.ActionModel#load(ActionModel.java:462) > > * > > > org.apache.isis.viewer.wicket.model.models.ActionModel#load(ActionModel.java:80) > > * > > > org.apache.wicket.model.LoadableDetachableModel#getObject(LoadableDetachableModel.java:124) > > * > > > org.apache.isis.viewer.wicket.model.models.ActionModel#executeHandlingApplicationExceptions(ActionModel.java:568) > > * > > > org.apache.isis.viewer.wicket.ui.components.actions.ActionPanel#executeActionOnTargetAndProcessResults(ActionPanel.java:255) > > * > > > org.apache.isis.viewer.wicket.ui.components.actions.ActionPanel#executeAndProcessResults(ActionPanel.java:204) > > * > > > org.apache.isis.viewer.wicket.ui.components.actions.ActionPanel#buildGuiForNoParameters(ActionPanel.java:162) > > * > > > org.apache.isis.viewer.wicket.ui.components.actions.ActionPanel#buildGui(ActionPanel.java:104) > > * > > > org.apache.isis.viewer.wicket.ui.components.actions.ActionPanel#<init>(ActionPanel.java:83) > > * > > > org.apache.isis.viewer.wicket.ui.components.actions.ActionPanelFactory#createComponent(ActionPanelFactory.java:49) > > * > > > org.apache.isis.viewer.wicket.viewer.registries.components.ComponentFactoryRegistryDefault#createComponent(ComponentFactoryRegistryDefault.java:128) > > * > > > org.apache.isis.viewer.wicket.ui.components.widgets.linkandlabel.ActionLinkFactoryAbstract$1#onClick(ActionLinkFactoryAbstract.java:85) > > * > > org.apache.wicket.ajax.markup.html.AjaxLink$1#onEvent(AjaxLink.java:86) > > * > > > org.apache.wicket.ajax.AjaxEventBehavior#respond(AjaxEventBehavior.java:146) > > * > > > org.apache.wicket.ajax.AbstractDefaultAjaxBehavior#onRequest(AbstractDefaultAjaxBehavior.java:641) > > * > > > sun.reflect.NativeMethodAccessorImpl#invoke0(NativeMethodAccessorImpl.java:-2) > > * > > > sun.reflect.NativeMethodAccessorImpl#invoke(NativeMethodAccessorImpl.java:62) > > * > > > sun.reflect.DelegatingMethodAccessorImpl#invoke(DelegatingMethodAccessorImpl.java:43) > > * java.lang.reflect.Method#invoke(Method.java:498) > > * > > > org.apache.wicket.RequestListenerInterface#internalInvoke(RequestListenerInterface.java:258) > > * > > > org.apache.wicket.RequestListenerInterface#invoke(RequestListenerInterface.java:241) > > * > > > org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler#invokeListener(ListenerInterfaceRequestHandler.java:250) > > * > > > org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler#respond(ListenerInterfaceRequestHandler.java:236) > > * > > > org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor#respond(RequestCycle.java:890) > > * > > > org.apache.wicket.request.RequestHandlerStack#execute(RequestHandlerStack.java:64) > > * > > > org.apache.wicket.request.cycle.RequestCycle#execute(RequestCycle.java:261) > > * > > > org.apache.wicket.request.cycle.RequestCycle#processRequest(RequestCycle.java:218) > > * > > > org.apache.wicket.request.cycle.RequestCycle#processRequestAndDetach(RequestCycle.java:289) > > * > > > org.apache.wicket.protocol.http.WicketFilter#processRequestCycle(WicketFilter.java:259) > > * > > > org.apache.wicket.protocol.http.WicketFilter#processRequest(WicketFilter.java:201) > > * > > > org.apache.wicket.protocol.http.WicketFilter#doFilter(WicketFilter.java:282) > > * > > > org.eclipse.jetty.servlet.ServletHandler$CachedChain#doFilter(ServletHandler.java:1668) > > * > > > org.apache.isis.core.webapp.diagnostics.IsisLogOnExceptionFilter#doFilter(IsisLogOnExceptionFilter.java:52) > > * > > > org.eclipse.jetty.servlet.ServletHandler$CachedChain#doFilter(ServletHandler.java:1668) > > * > > > org.apache.shiro.web.servlet.AbstractShiroFilter#executeChain(AbstractShiroFilter.java:449) > > * > > > org.apache.shiro.web.servlet.AbstractShiroFilter$1#call(AbstractShiroFilter.java:365) > > * > > > org.apache.shiro.subject.support.SubjectCallable#doCall(SubjectCallable.java:90) > > * > > > org.apache.shiro.subject.support.SubjectCallable#call(SubjectCallable.java:83) > > * > > > org.apache.shiro.subject.support.DelegatingSubject#execute(DelegatingSubject.java:383) > > * > > > org.apache.shiro.web.servlet.AbstractShiroFilter#doFilterInternal(AbstractShiroFilter.java:362) > > * > > > org.apache.shiro.web.servlet.OncePerRequestFilter#doFilter(OncePerRequestFilter.java:125) > > * > > > org.eclipse.jetty.servlet.ServletHandler$CachedChain#doFilter(ServletHandler.java:1668) > > * > > > org.eclipse.jetty.servlet.ServletHandler#doHandle(ServletHandler.java:581) > > * > > > org.eclipse.jetty.server.handler.ScopedHandler#handle(ScopedHandler.java:143) > > * > > > org.eclipse.jetty.security.SecurityHandler#handle(SecurityHandler.java:548) > > * > > > org.eclipse.jetty.server.session.SessionHandler#doHandle(SessionHandler.java:226) > > * > > > org.eclipse.jetty.server.handler.ContextHandler#doHandle(ContextHandler.java:1158) > > * > > > org.eclipse.jetty.servlet.ServletHandler#doScope(ServletHandler.java:511) > > * > > > org.eclipse.jetty.server.session.SessionHandler#doScope(SessionHandler.java:185) > > * > > > org.eclipse.jetty.server.handler.ContextHandler#doScope(ContextHandler.java:1090) > > * > > > org.eclipse.jetty.server.handler.ScopedHandler#handle(ScopedHandler.java:141) > > * > > > org.eclipse.jetty.server.handler.HandlerWrapper#handle(HandlerWrapper.java:119) > > * org.eclipse.jetty.server.Server#handle(Server.java:517) > > * org.eclipse.jetty.server.HttpChannel#handle(HttpChannel.java:308) > > * > > > org.eclipse.jetty.server.HttpConnection#onFillable(HttpConnection.java:242) > > * org.eclipse.jetty.io > > .AbstractConnection$ReadCallback#succeeded(AbstractConnection.java:261) > > * org.eclipse.jetty.io.FillInterest#fillable(FillInterest.java:95) > > * org.eclipse.jetty.io > > .SelectChannelEndPoint$2#run(SelectChannelEndPoint.java:75) > > * > > > org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume#produceAndRun(ExecuteProduceConsume.java:213) > > * > > > org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume#run(ExecuteProduceConsume.java:147) > > * > > > org.eclipse.jetty.util.thread.QueuedThreadPool#runJob(QueuedThreadPool.java:654) > > * > > > org.eclipse.jetty.util.thread.QueuedThreadPool$3#run(QueuedThreadPool.java:572) > > * java.lang.Thread#run(Thread.java:748) > > > > -- > DISCLAIMER: This e-mail is from Haywood Associates Ltd (Registered Number > 3525455) and it and its attachments may be confidential and are intended > solely for the use of the individual to whom it is addressed. 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