Transações no EJB3

Opa,

estou precisando manter uma sessão aberta no EJB3. Mais especificamente, eu preciso abrir a sessão (em um bean stateless) e manter ela aberta durante um tempo indeterminado, em que o usuário poderá acessar algumas entidades que são carregadas por um relacionamento lazy navegando pelas telas do sistema. Já tentei usar UserTransaction, mais eu recebo o erro:javax.transaction.NotSupportedException 16:52:52,651 ERROR [STDERR] at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.begin(BaseTransaction.java:79) 16:52:52,651 ERROR [STDERR] at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.begin(BaseTransactionManagerDelegate.java:77) 16:52:52,651 ERROR [STDERR] at org.jboss.tm.usertx.client.ServerVMClientUserTransaction.begin(ServerVMClientUserTransaction.java:124) 16:52:52,651 ERROR [STDERR] at model.ejb.dao.impl.ProjetoDAOImpl.listar(ProjetoDAOImpl.java:40) 16:52:52,651 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 16:52:52,651 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 16:52:52,652 ERROR [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 16:52:52,652 ERROR [STDERR] at java.lang.reflect.Method.invoke(Method.java:597) 16:52:52,652 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:112) 16:52:52,652 ERROR [STDERR] at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:166) 16:52:52,652 ERROR [STDERR] at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63) 16:52:52,652 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) 16:52:52,652 ERROR [STDERR] at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54) 16:52:52,652 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) 16:52:52,653 ERROR [STDERR] at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47) 16:52:52,653 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) 16:52:52,653 ERROR [STDERR] at org.jboss.aspects.tx.TxPolicy.invokeInCallerTx(TxPolicy.java:126) 16:52:52,653 ERROR [STDERR] at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:195) 16:52:52,653 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) 16:52:52,654 ERROR [STDERR] at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:95) 16:52:52,654 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) 16:52:52,654 ERROR [STDERR] at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:62) 16:52:52,654 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) 16:52:52,654 ERROR [STDERR] at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:77) 16:52:52,654 ERROR [STDERR] at org.jboss.ejb3.security.Ejb3AuthenticationInterceptor.invoke(Ejb3AuthenticationInterceptor.java:110) 16:52:52,654 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) 16:52:52,654 ERROR [STDERR] at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:46) 16:52:52,654 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) 16:52:52,654 ERROR [STDERR] at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106) 16:52:52,654 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) 16:52:52,654 ERROR [STDERR] at org.jboss.ejb3.stateless.StatelessContainer.localInvoke(StatelessContainer.java:240) 16:52:52,654 ERROR [STDERR] at org.jboss.ejb3.stateless.StatelessContainer.localInvoke(StatelessContainer.java:210) 16:52:52,655 ERROR [STDERR] at org.jboss.ejb3.stateless.StatelessLocalProxy.invoke(StatelessLocalProxy.java:84) 16:52:52,655 ERROR [STDERR] at $Proxy547.listar(Unknown Source) 16:52:52,655 ERROR [STDERR] at model.ejb.bo.impl.ProjetoBOImpl.listar(ProjetoBOImpl.java:20) 16:52:52,655 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 16:52:52,655 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 16:52:52,655 ERROR [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 16:52:52,655 ERROR [STDERR] at java.lang.reflect.Method.invoke(Method.java:597) 16:52:52,655 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:112) 16:52:52,655 ERROR [STDERR] at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:166) 16:52:52,655 ERROR [STDERR] at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63) 16:52:52,655 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) 16:52:52,655 ERROR [STDERR] at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54) 16:52:52,655 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) 16:52:52,655 ERROR [STDERR] at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47) 16:52:52,656 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) 16:52:52,656 ERROR [STDERR] at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:79) 16:52:52,656 ERROR [STDERR] at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:191) 16:52:52,656 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) 16:52:52,656 ERROR [STDERR] at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:95) 16:52:52,656 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) 16:52:52,656 ERROR [STDERR] at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:62) 16:52:52,656 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) 16:52:52,656 ERROR [STDERR] at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:77) 16:52:52,656 ERROR [STDERR] at org.jboss.ejb3.security.Ejb3AuthenticationInterceptor.invoke(Ejb3AuthenticationInterceptor.java:110) 16:52:52,656 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) 16:52:52,656 ERROR [STDERR] at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:46) 16:52:52,656 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) 16:52:52,656 ERROR [STDERR] at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106) 16:52:52,657 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) 16:52:52,657 ERROR [STDERR] at org.jboss.ejb3.stateless.StatelessContainer.localInvoke(StatelessContainer.java:240) 16:52:52,657 ERROR [STDERR] at org.jboss.ejb3.stateless.StatelessContainer.localInvoke(StatelessContainer.java:210) 16:52:52,657 ERROR [STDERR] at org.jboss.ejb3.stateless.StatelessLocalProxy.invoke(StatelessLocalProxy.java:84) 16:52:52,657 ERROR [STDERR] at $Proxy550.listar(Unknown Source) 16:52:52,657 ERROR [STDERR] at view.beans.ProjetoMB.buscarProjetos(ProjetoMB.java:58) 16:52:52,657 ERROR [STDERR] at view.beans.ProjetoMB.<init>(ProjetoMB.java:54) 16:52:52,657 ERROR [STDERR] at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 16:52:52,657 ERROR [STDERR] at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) 16:52:52,657 ERROR [STDERR] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) 16:52:52,657 ERROR [STDERR] at java.lang.reflect.Constructor.newInstance(Constructor.java:513) 16:52:52,657 ERROR [STDERR] at java.lang.Class.newInstance0(Class.java:355) 16:52:52,657 ERROR [STDERR] at java.lang.Class.newInstance(Class.java:308) 16:52:52,657 ERROR [STDERR] at com.sun.faces.mgbean.BeanBuilder.newBeanInstance(BeanBuilder.java:186) 16:52:52,658 ERROR [STDERR] at com.sun.faces.mgbean.BeanBuilder.build(BeanBuilder.java:106) 16:52:52,658 ERROR [STDERR] at com.sun.faces.mgbean.BeanManager.createAndPush(BeanManager.java:368) 16:52:52,658 ERROR [STDERR] at com.sun.faces.mgbean.BeanManager.create(BeanManager.java:222) 16:52:52,658 ERROR [STDERR] at com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:88) 16:52:52,658 ERROR [STDERR] at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:53) 16:52:52,658 ERROR [STDERR] at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:72) 16:52:52,658 ERROR [STDERR] at org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:45) 16:52:52,658 ERROR [STDERR] at org.apache.el.parser.AstValue.getValue(AstValue.java:86) 16:52:52,658 ERROR [STDERR] at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186) 16:52:52,658 ERROR [STDERR] at org.apache.jasper.el.JspValueExpression.getValue(JspValueExpression.java:101) 16:52:52,658 ERROR [STDERR] at javax.faces.component.UIData.getValue(UIData.java:609) 16:52:52,658 ERROR [STDERR] at javax.faces.component.UIData.getDataModel(UIData.java:1124) 16:52:52,658 ERROR [STDERR] at javax.faces.component.UIData.setRowIndex(UIData.java:451) 16:52:52,659 ERROR [STDERR] at com.sun.faces.renderkit.html_basic.TableRenderer.encodeBegin(TableRenderer.java:77) 16:52:52,659 ERROR [STDERR] at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:813) 16:52:52,659 ERROR [STDERR] at javax.faces.component.UIData.encodeBegin(UIData.java:962) 16:52:52,659 ERROR [STDERR] at javax.faces.component.UIComponent.encodeAll(UIComponent.java:934) 16:52:52,659 ERROR [STDERR] at javax.faces.render.Renderer.encodeChildren(Renderer.java:148) 16:52:52,659 ERROR [STDERR] at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837) 16:52:52,659 ERROR [STDERR] at javax.faces.component.UIComponent.encodeAll(UIComponent.java:936) 16:52:52,659 ERROR [STDERR] at javax.faces.component.UIComponent.encodeAll(UIComponent.java:942) 16:52:52,659 ERROR [STDERR] at com.sun.faces.application.ViewHandlerImpl.doRenderView(ViewHandlerImpl.java:271) 16:52:52,659 ERROR [STDERR] at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:202) 16:52:52,659 ERROR [STDERR] at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:109) 16:52:52,659 ERROR [STDERR] at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100) 16:52:52,659 ERROR [STDERR] at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) 16:52:52,660 ERROR [STDERR] at javax.faces.webapp.FacesServlet.service(FacesServlet.java:266) 16:52:52,660 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) 16:52:52,660 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 16:52:52,660 ERROR [STDERR] at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) 16:52:52,660 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 16:52:52,660 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 16:52:52,660 ERROR [STDERR] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230) 16:52:52,660 ERROR [STDERR] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) 16:52:52,660 ERROR [STDERR] at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:182) 16:52:52,660 ERROR [STDERR] at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84) 16:52:52,660 ERROR [STDERR] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) 16:52:52,660 ERROR [STDERR] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) 16:52:52,660 ERROR [STDERR] at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157) 16:52:52,660 ERROR [STDERR] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 16:52:52,661 ERROR [STDERR] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262) 16:52:52,661 ERROR [STDERR] at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) 16:52:52,661 ERROR [STDERR] at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) 16:52:52,661 ERROR [STDERR] at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446) 16:52:52,661 ERROR [STDERR] at java.lang.Thread.run(Thread.java:619) 16:52:52,661 WARN [AbstractEntityManagerImpl] Cannot join transaction, not a JoinableCMTTransaction 16:52:52,662 WARN [AbstractEntityManagerImpl] Cannot join transaction, not a JoinableCMTTransaction

Também já tentei usar OpenSessionInView, mas quando eu não fecho a sessão no fim da primeira requisição (feita pelo FacesServlet) o servidor reclama:Application error: Faces Servlet did not complete its transaction

Alguém tem alguma sugestão de como fazer? Ou eu errando algum detalhe em alguma das formas acima? Valeu!!!