Hi! Please note that javax.inject.Singleton is completely underspecified! I suggest to not use it at all ;)
LieGrue, strub --- On Fri, 7/8/11, Gerhard Petracek <gerhard.petra...@gmail.com> wrote: > From: Gerhard Petracek <gerhard.petra...@gmail.com> > Subject: Re: @Disposes and webapp shutdown and @Singleton/@ApplicationScope > To: "MyFaces Discussion" <users@myfaces.apache.org> > Date: Friday, July 8, 2011, 7:31 AM > hi pieter, > > in the end you have to shutdown one of both scopes first. > if you change the > behaviour, you would have a problem the other way round. > please always use @ApplicationScoped instead of @Singleton > (in terms of cdi > @Singleton isn't specified very clearly - it's part of jsr > 330 which doesn't > say a lot about it). > > regards, > gerhard > > http://www.irian.at > > Your JSF powerhouse - > JSF Consulting, Development and > Courses in English and German > > Professional Support for Apache MyFaces > > > > 2011/7/8 Pieter Martin <pieter.mar...@gmail.com> > > > Hi, > > > > I have an application scoped producer method together > with a disposer which > > sits in a @javax.inject.Singleton scoped class. > > > > @Singleton > > public class DbProducer implements Serializable { > > @ApplicationScopedDb > > @Produces > > @ApplicationScoped > > public NakedGraph > getApplicationScopedNakedGraph**() { > > logger.info("produce > Application scoped db"); > > NakedGraph db = > createNakedGraph(); > > return db; > > } > > > > public void > closeApplicationScoped(@**Disposes @ApplicationScopedDb > > NakedGraph db) { > > logger.info("shutdown > Application scoped db"); > > if (db != null) { > > > db.shutdown(); > > } > > } > > } > > > > On shutting down jetty I get the following exception. > > > > SEVERE: Exception thrown while destroying bean > instance : > > [Name:null,WebBeans Type:PRODUCERMETHOD,API > Types:[com.tinkerpop.** > > > blueprints.pgm.Graph,java.io.**Serializable,org.nakeduml.** > > > tinker.runtime.NakedGraph,com.**tinkerpop.blueprints.pgm.** > > > IndexableGraph,java.lang.**Object,com.tinkerpop.**blueprints.pgm.** > > TransactionalGraph],**Qualifiers:[javax.enterprise.** > > > inject.Any,org.nakeduml.**tinker.runtime.**ApplicationScopedDb]] > > java.lang.NullPointerException > > at > org.apache.webbeans.component.**ProducerMethodBean.**disposeDefault( > > **ProducerMethodBean.java:346) > > at > org.apache.webbeans.component.**ProducerMethodBean.dispose(** > > ProducerMethodBean.java:306) > > at > org.apache.webbeans.component.**ProducerMethodBean.** > > destroyInstance(**ProducerMethodBean.java:298) > > at > org.apache.webbeans.component.**AbstractOwbBean.** > > destroyCreatedInstance(**AbstractOwbBean.java:277) > > at > org.apache.webbeans.portable.**creation.AbstractProducer.** > > dispose(AbstractProducer.java:**91) > > at > org.apache.webbeans.component.**InjectionTargetWrapper.**dispose(** > > InjectionTargetWrapper.java:**116) > > at > org.apache.webbeans.component.**AbstractOwbBean.destroy(** > > AbstractOwbBean.java:242) > > at > org.apache.webbeans.context.**AbstractContext.**destroyInstance(** > > AbstractContext.java:257) > > at > org.apache.webbeans.context.**AbstractContext.destroy(** > > AbstractContext.java:279) > > at > org.apache.webbeans.web.**context.WebContextsService.** > > > destroyApplicationContext(**WebContextsService.java:485) > > at > org.apache.webbeans.web.**context.WebContextsService.** > > endContext(WebContextsService.**java:200) > > at > org.apache.webbeans.web.**context.WebContextsService.** > > destroy(WebContextsService.**java:155) > > at > org.apache.webbeans.lifecycle.**AbstractLifeCycle.**stopApplication( > > **AbstractLifeCycle.java:149) > > at > org.apache.webbeans.web.**lifecycle.**WebContainerLifecycle.** > > stopApplication(**WebContainerLifecycle.java:87) > > at > org.apache.webbeans.servlet.**WebBeansConfigurationListener.** > > > contextDestroyed(**WebBeansConfigurationListener.**java:96) > > at > org.eclipse.jetty.server.**handler.ContextHandler.doStop(** > > ContextHandler.java:679) > > at > org.eclipse.jetty.servlet.**ServletContextHandler.doStop(** > > ServletContextHandler.java:**143) > > at > org.eclipse.jetty.webapp.**WebAppContext.doStop(** > > WebAppContext.java:473) > > at > org.eclipse.jetty.util.**component.AbstractLifeCycle.** > > stop(AbstractLifeCycle.java:**83) > > at > org.eclipse.jetty.server.**handler.HandlerCollection.** > > doStop(HandlerCollection.java:**245) > > at > org.eclipse.jetty.util.**component.AbstractLifeCycle.** > > stop(AbstractLifeCycle.java:**83) > > at > org.eclipse.jetty.server.**handler.HandlerWrapper.doStop(** > > HandlerWrapper.java:101) > > at > org.eclipse.jetty.server.**Server.doStop(Server.java:319) > > at > org.eclipse.jetty.util.**component.AbstractLifeCycle.** > > stop(AbstractLifeCycle.java:**83) > > at > org.nakeduml.jetty.StartJetty$**MonitorThread.run(StartJetty.** > > java:92) > > > > > > Some investigation shows that the base exception is a > > > > "new ContextNotActiveException("**WebBeans context > with scope type > > annotation @" + scopeType.getSimpleName() + " does not > exist within current > > thread");" > > > > This exception however gets swallowed by the above > exception that is thrown > > in the finally part of > ProducerMethodBean.**disposeDefault. > > The scope that is not active is > javax.inject.Singleton > > > > I subsequently replaced @Singleton with > @ApplicationScope and then > > everything works. > > > > Should @Singleton also have worked and when should one > use which > > annotation? > > > > Thanks > > Pieter > > >
