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 <[email protected]> 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" <[email protected]> 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 <[email protected]> >> >>> 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 <[email protected]> >>> >>>> 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. <[email protected]> >>>> >>>>> 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 < >>> [email protected] >>>>>> 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* >> ------------------------------------------------------------------- >>
