Obvious question: if Google rate-limited you, how did you end up posting duplicates?
On 12 March 2013 01:57, Howard W. Smith, Jr. <smithh032...@gmail.com> wrote: > Wanted to share... > > 1. I recently added ActiveMQ logic and dependency (TomEE's simple MDB > example) to update Google Calendar with data from database as user is in > web app modifying data; the non-MDB logic worked, but duplicates existed on > the Google Calendar, since Google Calendar has limits on # of requests per > user (within a matter of seconds) > > 2. The new simple MDB implementation resulted in many more duplicate events > on the Google Calendar, since messages were processed, asynchronously > > 3. This morning, I (FINALLY) fixed the 'duplicate events issue' by marking > the GoogleCalendarUtil bean as @Singleton with @Lock(WRITE), adding one > point of entry (deleteAndAddEvents method marked with @AccessTimeout), > defined 'deleteEvents' and 'addEventToCalendar' method as private (since > they were defined as 'public' methods, ever since 'birth'), and refactored > throughout the app, accordingly. > > Was this the most appropriate fix? Probably not, but I was happy to develop > some code based on recommendation(s) that David Blevins shared months ago. > :) > > > > On Fri, Mar 8, 2013 at 9:25 AM, Howard W. Smith, Jr. < > smithh032...@gmail.com > > wrote: > > > +1 to any/all David Blevin's responses...and of course, the same for all > > of Romain's responses as well! > > > > Just to share... I remember I used to see a bunch of LOCK exceptions in > > server log with @Singleton after David advised me to use @Singleton, but > I > > kept tuning the implementation. Now, I have not seen those exceptions any > > more in server log. I don't know if it was just a TomEE 1.5.1 bug that > got > > fixed in 1.5.2-SNAPSHOT, but recently, I decreased the # of minutes on > the > > @Schedule method defined on the only 2 @Singleton beans I have, and > still, > > it is performing (very) well and no exceptions in server log. > > > > I know this may be a bit unrelated, but still thought I might share. I'm > > hoping to add more @Singleton for @Schedule tasks. > > > > My code has been working well with @Stateless for the design, which is > > evident when web application code is generated by NetBeans from database > > schema. > > > > Entity bean > @Stateless EJB for the entity bean > JSF managed bean which > > references @Stateless EJB and entity bean > xhtml page, which references > > the JSF managed bean > > > > Of course, I have done refactoring to meet requirements. :) > > > > This design/implementation has worked for me, in production, while the > app > > was running on Glassfish 3.1+ and now with TomEE. > > > > > > On Thu, Mar 7, 2013 at 7:10 PM, David Blevins <david.blev...@gmail.com > >wrote: > > > >> I'd also recommend @Singleton in conjunction with @Lock(READ). > >> > >> The @Stateless bean type is good when you explicitly need to limit the > >> number of instances/concurrent calls. If this sort of limiting is not a > >> critical part of the design, then likely @Stateless was used because > this > >> is the bean type people tend to use by default. > >> > >> Really, @Singleton with @Lock(READ) should be used by default and other > >> bean types used only when there is a specific design goal you need to > >> achieve. > >> > >> > >> -David > >> > >> On Mar 6, 2013, at 10:19 AM, Romain Manni-Bucau <rmannibu...@gmail.com> > >> wrote: > >> > >> > In very very heavy load and for a simple app it can be as much as your > >> http > >> > request thread pool size (200 by default) > >> > > >> > Note: using @Singleton can help too if you can > >> > Le 6 mars 2013 18:51, "José Luis Cetina" <maxtorz...@gmail.com> a > >> écrit : > >> > > >> >> Really im not sure how many users the webapp could handle, because > is a > >> >> public webapp, i will increase the MaxSize to 50 or 100, but for any > >> >> "unexpected > >> >> overload" i will let StrictPooling to false. > >> >> > >> >> Do you consider its to much to increase to 50/100 to maxsize?? > >> >> > >> >> > >> >> > >> >> 2013/3/6 Jean-Louis MONTEIRO <jeano...@gmail.com> > >> >> > >> >>> José, > >> >>> > >> >>> The MinSize is not the problem IMO. > >> >>> The MaxSize is definitely the issue. Do you have more than 10 > (default > >> >>> value) simultaneous users? > >> >>> > >> >>> The StrictPooling is great to be able to always answer in case of > >> small > >> >>> over load. > >> >>> But, you have to know that after being used, instances will be > removed > >> >> and > >> >>> garbage collected. > >> >>> > >> >>> Also, creating instances can be consuming depending on the bean. > >> >>> > >> >>> I would recommend not only to set it to true, but before, trying to > >> >> define > >> >>> as much as possible the correct value for MaxSize depending on your > >> SLAs. > >> >>> > >> >>> Hope it helps > >> >>> JLouis > >> >>> > >> >>> > >> >>> > >> >>> > >> >>> 2013/3/6 José Luis Cetina <maxtorz...@gmail.com> > >> >>> > >> >>>> Im using 1.6.0-SNAPSHOT. > >> >>>> > >> >>>> I will change > >> >>>> > >> >>>> StrictPooling = true ==> false > >> >>>> MinSize = 0 ==> 2 > >> >>>> > >> >>>> In stateless section and let you know. > >> >>>> > >> >>>> > >> >>>> > >> >>>> 2013/3/6 Howard W. Smith, Jr. <smithh032...@gmail.com> > >> >>>> > >> >>>>> José, > >> >>>>> > >> >>>>> I'm sure the others will ask, are you seeing this with tomee 1.5.2 > >> or > >> >>>> 1.6.0 > >> >>>>> snapshot? or only seeing on your production server running tomee > >> >> 1.5.1 > >> >>>> or > >> >>>>> 1.5.2 / 1.6.0 snapshot? > >> >>>>> > >> >>>>> Wow, Jean-Louis beat me to it...asking for the TOMEE version. :) > >> >>>>> > >> >>>>> Also, i searched google for the following: > >> >>>>> > >> >>>>> No instances available in Stateless Session Bean pool > >> >>>>> > >> >>>>> and found the following (which is definitely related to Jean-Louis > >> >>>>> response): > >> >>>>> > >> >>>>> [1] > >> >>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > http://apache-geronimo.328035.n3.nabble.com/jira-Created-GERONIMO-5455-quot-No-instances-available-in-Stateless-Session-Bean-pool-quot-error-wher-td978236.html > >> >>>>> > >> >>>>> [2] > >> >>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > http://openejb.979440.n4.nabble.com/Query-Regarding-Stateless-Session-Bean-Instance-Pool-Configuration-td980239.html > >> >>>>> > >> >>>>> [3] > >> http://docs.oracle.com/cd/E15051_01/wls/docs103/ejb/session.html > >> >>>>> > >> >>>>> > >> >>>>> Howard > >> >>>>> > >> >>>>> > >> >>>>> On Wed, Mar 6, 2013 at 10:46 AM, José Luis Cetina < > >> >>> maxtorz...@gmail.com > >> >>>>>> wrote: > >> >>>>> > >> >>>>>> Hi im gettin *ConcurrentAccessTimeoutException: No instances > >> >>> available > >> >>>> in > >> >>>>>> Stateless Session Bean pool. Waited 30 SECONDS....* > >> >>>>>> > >> >>>>>> Here is the complete log: http://pastebin.ca/2328770 > >> >>>>>> > >> >>>>>> Any advice, what could be? Do i have to configure something in > >> >>>>> tomee.xml?? > >> >>>>>> > >> >>>>>> Part of the log: > >> >>>>>> > >> >>>>>> > >> >>>>>> *Mar 05, 2013 9:38:20 PM > >> >> org.apache.openejb.cdi.CdiAppContextsService > >> >>>>>> lazyStartSessionContext > >> >>>>>> WARNING: Could NOT lazily initialize session context because of > >> >> null > >> >>>>>> RequestContext > >> >>>>>> javax.ejb.ConcurrentAccessTimeoutException: No instances > available > >> >> in > >> >>>>>> Stateless Session Bean pool. Waited 30 SECONDS > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.openejb.core.stateless.StatelessInstanceManager.getInstance(StatelessInstanceManager.java:190) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.openejb.core.stateless.StatelessContainer.invoke(StatelessContainer.java:186) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.openejb.core.ivm.EjbObjectProxyHandler.synchronizedBusinessMethod(EjbObjectProxyHandler.java:256) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.openejb.core.ivm.EjbObjectProxyHandler.businessMethod(EjbObjectProxyHandler.java:251) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.openejb.core.ivm.EjbObjectProxyHandler._invoke(EjbObjectProxyHandler.java:85) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.openejb.core.ivm.BaseEjbProxyHandler.invoke(BaseEjbProxyHandler.java:279) > >> >>>>>> at sun.proxy.$Proxy245.getExamenAplicado(Unknown Source) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > com.grupokx.preparatorianos.controller.examendiagnostico.ExamenDiagnosticoMBean.mypostconstruct(ExamenDiagnosticoMBean.java:63) > >> >>>>>> at sun.reflect.GeneratedMethodAccessor800.invoke(Unknown Source) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) > >> >>>>>> at java.lang.reflect.Method.invoke(Method.java:601) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.tomee.catalina.JavaeeInstanceManager.postConstruct(JavaeeInstanceManager.java:132) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.tomee.catalina.JavaeeInstanceManager.newInstance(JavaeeInstanceManager.java:69) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.myfaces.config.annotation.Tomcat7AnnotationLifecycleProvider.postConstruct(Tomcat7AnnotationLifecycleProvider.java:94) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.myfaces.config.ManagedBeanBuilder.buildManagedBean(ManagedBeanBuilder.java:213) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.myfaces.el.unified.resolver.ManagedBeanResolver.createManagedBean(ManagedBeanResolver.java:333) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.myfaces.el.unified.resolver.ManagedBeanResolver.getValue(ManagedBeanResolver.java:296) > >> >>>>>> at > >> >> javax.el.CompositeELResolver.getValue(CompositeELResolver.java:58) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.myfaces.el.unified.resolver.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:179) > >> >>>>>> at > >> >> org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:72) > >> >>>>>> at org.apache.el.parser.AstValue.getValue(AstValue.java:161) > >> >>>>>> at org.apache.el.parser.AstEqual.getValue(AstEqual.java:38) > >> >>>>>> at > >> >>>>> > >> >>> > >> org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:185) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.webbeans.el.WrappedValueExpression.getValue(WrappedValueExpression.java:68) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.myfaces.view.facelets.el.ContextAwareTagValueExpression.getValue(ContextAwareTagValueExpression.java:96) > >> >>>>>> at > >> >>>>> > >> >>> > >> javax.faces.component._DeltaStateHelper.eval(_DeltaStateHelper.java:266) > >> >>>>>> at > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > javax.faces.component.UIComponentBase.isRendered(UIComponentBase.java:1187) > >> >>>>>> at > >> >>>>>> > >> >>>> > >> >> > >> > javax.faces.component.UIComponentBase.encodeAll(UIComponentBase.java:494) > >> >>>>>> at > >> >>>>>> > >> >>>> > >> >> > >> > javax.faces.component.UIComponentBase.encodeAll(UIComponentBase.java:541) > >> >>>>>> at > >> >>>>>> > >> >>>> > >> >> > >> > javax.faces.component.UIComponentBase.encodeAll(UIComponentBase.java:541) > >> >>>>>> at > >> >>>>>> > >> >>>> > >> >> > >> > javax.faces.component.UIComponentBase.encodeAll(UIComponentBase.java:541) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.myfaces.view.facelets.FaceletViewDeclarationLanguage.renderView(FaceletViewDeclarationLanguage.java:1981) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.myfaces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:285) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:59) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:116) > >> >>>>>> at > >> >>>>>> > >> >>>> > >> >> > >> > org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:241) > >> >>>>>> at javax.faces.webapp.FacesServlet.service(FacesServlet.java:199) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) > >> >>>>>> at > >> >>> org.apache.tomee.catalina.OpenEJBValve.invoke(OpenEJBValve.java:45) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) > >> >>>>>> at > >> >>>>>> > >> >>>> > >> >> > >> > org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) > >> >>>>>> at > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) > >> >>>>>> at > >> >> org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:200) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) > >> >>>>>> at > >> >>>>>> > >> >>>>>> > >> >>>>> > >> >>>> > >> >>> > >> >> > >> > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) > >> >>>>>> at java.lang.Thread.run(Thread.java:722) > >> >>>>>> * > >> >>>>>> > >> >>>>> > >> >>>> > >> >>>> > >> >>>> > >> >>>> -- > >> >>>> ------------------------------------------------------------------- > >> >>>> *SCJA. José Luis Cetina* > >> >>>> ------------------------------------------------------------------- > >> >>>> > >> >>> > >> >>> > >> >>> > >> >>> -- > >> >>> Jean-Louis > >> >>> > >> >> > >> >> > >> >> > >> >> -- > >> >> ------------------------------------------------------------------- > >> >> *SCJA. José Luis Cetina* > >> >> ------------------------------------------------------------------- > >> >> > >> > >> > > >
