alguem saberia me dizer quais grandes sites/portais/sistemas utilizam JEE?
sem referencia não vale!! 
abraço!
“Sem referência” quer dizer o quê? Se não estiver noticiado em algum site de jornal ou revista? Se for assim, é melhor você procurar nos sites de jornais e revistas. Procure por Bradesco, Caixa, Banco do Brasil, etc.
JSF
Hauhauaahauahauhau
O CompraFacil não valeu… 8)
GUJ
www.bb.com.br
Carrefour.com.br - JSF
Bom, creio que site da vivo seja, pois estava tentando logar para ver minha conta e apareceu isso, sendo eu, um simples usuário 
[code]Error opening /br/com/vivo/vol/portal/login/LoginController.jpf.
The source of this error is:
com.bea.portlet.adapter.scopedcontent.ActionLookupFailedException: java.lang.AssertionError: Cannot invoke ‘postLogin’ method on SessionHelper because com.bea.p13n.usermgmt.UserManagementException: Cannot get new user profile because java.rmi.RemoteException: EJB Exception: ; nested exception is:
com.bea.p13n.usermgmt.profile.ProfileSystemException: com.bea.p13n.property.ConfigurableEntitySystemException: java.sql.SQLException: Connection has been administratively disabled. Try later.
at com.bea.portlet.adapter.scopedcontent.ScopedContentCommonSupport.executeAction(ScopedContentCommonSupport.java:721)
at com.bea.portlet.adapter.scopedcontent.ScopedContentCommonSupport.processActionInternal(ScopedContentCommonSupport.java:141)
at com.bea.portlet.adapter.scopedcontent.PageFlowStubImpl.processAction(PageFlowStubImpl.java:108)
at com.bea.portlet.adapter.NetuiActionHandler.raiseScopedAction(NetuiActionHandler.java:111)
at com.bea.netuix.servlets.controls.content.NetuiContent.raiseScopedAction(NetuiContent.java:181)
at com.bea.netuix.servlets.controls.content.NetuiContent.raiseScopedAction(NetuiContent.java:167)
at com.bea.netuix.servlets.controls.content.NetuiContent.handlePostbackData(NetuiContent.java:225)
at com.bea.netuix.nf.ControlLifecycle$2.visit(ControlLifecycle.java:180)
at com.bea.netuix.nf.ControlTreeWalker.walkRecursive(ControlTreeWalker.java:324)
at com.bea.netuix.nf.ControlTreeWalker.walkRecursive(ControlTreeWalker.java:334)
at com.bea.netuix.nf.ControlTreeWalker.walkRecursive(ControlTreeWalker.java:334)
at com.bea.netuix.nf.ControlTreeWalker.walkRecursive(ControlTreeWalker.java:334)
at com.bea.netuix.nf.ControlTreeWalker.walkRecursive(ControlTreeWalker.java:334)
at com.bea.netuix.nf.ControlTreeWalker.walkRecursive(ControlTreeWalker.java:334)
at com.bea.netuix.nf.ControlTreeWalker.walkRecursive(ControlTreeWalker.java:334)
at com.bea.netuix.nf.ControlTreeWalker.walkRecursive(ControlTreeWalker.java:334)
at com.bea.netuix.nf.ControlTreeWalker.walkRecursive(ControlTreeWalker.java:334)
at com.bea.netuix.nf.ControlTreeWalker.walkRecursive(ControlTreeWalker.java:334)
at com.bea.netuix.nf.ControlTreeWalker.walkRecursive(ControlTreeWalker.java:334)
at com.bea.netuix.nf.ControlTreeWalker.walkRecursive(ControlTreeWalker.java:334)
at com.bea.netuix.nf.ControlTreeWalker.walkRecursive(ControlTreeWalker.java:334)
at com.bea.netuix.nf.ControlTreeWalker.walkRecursive(ControlTreeWalker.java:334)
at com.bea.netuix.nf.ControlTreeWalker.walk(ControlTreeWalker.java:130)
at com.bea.netuix.nf.Lifecycle.processLifecycles(Lifecycle.java:399)
at com.bea.netuix.nf.Lifecycle.processLifecycles(Lifecycle.java:361)
at com.bea.netuix.nf.Lifecycle.processLifecycles(Lifecycle.java:352)
at com.bea.netuix.nf.Lifecycle.runInbound(Lifecycle.java:184)
at com.bea.netuix.nf.Lifecycle.run(Lifecycle.java:159)
at com.bea.netuix.servlets.manager.UIServlet.runLifecycle(UIServlet.java:465)
at com.bea.netuix.servlets.manager.UIServlet.processControlTree(UIServlet.java:373)
at com.bea.netuix.servlets.manager.PortalServlet.service(PortalServlet.java:981)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:292)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at com.bea.content.manager.servlets.ContentServletFilter.doFilter(ContentServletFilter.java:178)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at com.bea.p13n.servlets.PortalServletFilter.doFilter(PortalServletFilter.java:336)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at com.bea.portal.tools.servlet.http.HttpContextFilter.doFilter(HttpContextFilter.java:60)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3592)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2202)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2108)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1432)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)
Caused by: java.lang.AssertionError: Cannot invoke ‘postLogin’ method on SessionHelper because com.bea.p13n.usermgmt.UserManagementException: Cannot get new user profile because java.rmi.RemoteException: EJB Exception: ; nested exception is:
com.bea.p13n.usermgmt.profile.ProfileSystemException: com.bea.p13n.property.ConfigurableEntitySystemException: java.sql.SQLException: Connection has been administratively disabled. Try later.
at com.bea.p13n.security.Authentication.postLogin(Authentication.java:427)
at com.bea.p13n.security.Authentication.login(Authentication.java:158)
at br.com.vivo.vol.portal.login.LoginController.doLogin(LoginController.java:328)
at sun.reflect.GeneratedMethodAccessor907.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.beehive.netui.pageflow.FlowController.invokeActionMethod(FlowController.java:870)
at org.apache.beehive.netui.pageflow.FlowController.getActionMethodForward(FlowController.java:809)
at org.apache.beehive.netui.pageflow.FlowController.internalExecute(FlowController.java:478)
at org.apache.beehive.netui.pageflow.PageFlowController.internalExecute(PageFlowController.java:306)
at org.apache.beehive.netui.pageflow.FlowController.execute(FlowController.java:336)
at org.apache.beehive.netui.pageflow.internal.FlowControllerAction.execute(FlowControllerAction.java:52)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
at org.apache.beehive.netui.pageflow.PageFlowRequestProcessor.access$201(PageFlowRequestProcessor.java:97)
at org.apache.beehive.netui.pageflow.PageFlowRequestProcessor$ActionRunner.execute(PageFlowRequestProcessor.java:2044)
at org.apache.beehive.netui.pageflow.interceptor.action.internal.ActionInterceptors$WrapActionInterceptorChain.continueChain(ActionInterceptors.java:64)
at org.apache.beehive.netui.pageflow.interceptor.action.ActionInterceptor.wrapAction(ActionInterceptor.java:184)
at org.apache.beehive.netui.pageflow.interceptor.action.internal.ActionInterceptors$WrapActionInterceptorChain.invoke(ActionInterceptors.java:50)
at org.apache.beehive.netui.pageflow.interceptor.action.internal.ActionInterceptors$WrapActionInterceptorChain.continueChain(ActionInterceptors.java:58)
at org.apache.beehive.netui.pageflow.interceptor.action.internal.ActionInterceptors.wrapAction(ActionInterceptors.java:87)
at org.apache.beehive.netui.pageflow.PageFlowRequestProcessor.processActionPerform(PageFlowRequestProcessor.java:2116)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
at org.apache.beehive.netui.pageflow.PageFlowRequestProcessor.processInternal(PageFlowRequestProcessor.java:556)
at org.apache.beehive.netui.pageflow.PageFlowRequestProcessor.process(PageFlowRequestProcessor.java:853)
at org.apache.beehive.netui.pageflow.AutoRegisterActionServlet.process(AutoRegisterActionServlet.java:631)
at org.apache.beehive.netui.pageflow.PageFlowActionServlet.process(PageFlowActionServlet.java:158)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
at org.apache.beehive.netui.pageflow.PageFlowUtils.strutsLookup(PageFlowUtils.java:1199)
at org.apache.beehive.netui.pageflow.PageFlowUtils.strutsLookup(PageFlowUtils.java:1129)
at com.bea.portlet.adapter.scopedcontent.framework.internal.PageFlowUtilsBeehiveDelegate.strutsLookupInternal(PageFlowUtilsBeehiveDelegate.java:43)
at com.bea.portlet.adapter.scopedcontent.framework.PageFlowUtils.strutsLookup(PageFlowUtils.java:108)
at com.bea.portlet.adapter.scopedcontent.ScopedContentCommonSupport.executeAction(ScopedContentCommonSupport.java:707)
… 50 more
Caused by: com.bea.p13n.usermgmt.UserManagementException: Cannot get new user profile because java.rmi.RemoteException: EJB Exception: ; nested exception is:
com.bea.p13n.usermgmt.profile.ProfileSystemException: com.bea.p13n.property.ConfigurableEntitySystemException: java.sql.SQLException: Connection has been administratively disabled. Try later.
at com.bea.p13n.usermgmt.profile.internal.ProfileConversion.swapProfiles(ProfileConversion.java:168)
at com.bea.p13n.usermgmt.profile.internal.ProfileConversion.swapProfiles(ProfileConversion.java:95)
at com.bea.p13n.usermgmt.SessionHelper.doPostLogin(SessionHelper.java:577)
at com.bea.p13n.usermgmt.SessionHelper.postLogin(SessionHelper.java:414)
at sun.reflect.GeneratedMethodAccessor7734.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.bea.p13n.security.Authentication.postLogin(Authentication.java:415)
… 81 more
Caused by: java.rmi.RemoteException: EJB Exception: ; nested exception is:
com.bea.p13n.usermgmt.profile.ProfileSystemException: com.bea.p13n.property.ConfigurableEntitySystemException: java.sql.SQLException: Connection has been administratively disabled. Try later.
at weblogic.ejb.container.internal.EJBRuntimeUtils.throwRemoteException(EJBRuntimeUtils.java:103)
at weblogic.ejb.container.internal.BaseRemoteObject.handleSystemException(BaseRemoteObject.java:869)
at weblogic.ejb.container.internal.BaseRemoteObject.handleSystemException(BaseRemoteObject.java:810)
at weblogic.ejb.container.internal.BaseRemoteObject.postInvoke1(BaseRemoteObject.java:515)
at weblogic.ejb.container.internal.StatelessRemoteObject.postInvoke1(StatelessRemoteObject.java:60)
at weblogic.ejb.container.internal.BaseRemoteObject.postInvokeTxRetry(BaseRemoteObject.java:442)
at com.bea.p13n.usermgmt.profile.internal.GroupProfileManager_nby5cw_EOImpl.profileExists(GroupProfileManager_nby5cw_EOImpl.java:1098)
at com.bea.p13n.usermgmt.profile.internal.ProfileHelper.groupProfileExists(ProfileHelper.java:294)
at com.bea.p13n.usermgmt.profile.internal.ProfileHelper.createGroupProfile(ProfileHelper.java:53)
at com.bea.p13n.usermgmt.profile.internal.ProfileConversion.swapProfiles(ProfileConversion.java:159)
… 88 more
Caused by: com.bea.p13n.usermgmt.profile.ProfileSystemException: com.bea.p13n.property.ConfigurableEntitySystemException: java.sql.SQLException: Connection has been administratively disabled. Try later.
at com.bea.p13n.usermgmt.profile.internal.ProfileManagerImpl.profileExists(ProfileManagerImpl.java:972)
at com.bea.p13n.usermgmt.profile.internal.GroupProfileManager_nby5cw_EOImpl.profileExists(GroupProfileManager_nby5cw_EOImpl.java:1084)
… 91 more
Caused by: com.bea.p13n.property.ConfigurableEntitySystemException: java.sql.SQLException: Connection has been administratively disabled. Try later.
at com.bea.p13n.property.internal.EntityPropertyManagerImpl.getUniqueId(EntityPropertyManagerImpl.java:672)
at com.bea.p13n.property.internal.EntityPropertyManager_pmrkio_EOImpl.getUniqueId(EntityPropertyManager_pmrkio_EOImpl.java:218)
at com.bea.p13n.usermgmt.profile.internal.ProfileManagerImpl.profileExists(ProfileManagerImpl.java:959)
… 92 more
Caused by: java.sql.SQLException: Connection has been administratively disabled. Try later.
at weblogic.jdbc.common.internal.ConnectionEnv.checkIfEnabled(ConnectionEnv.java:838)
at weblogic.jdbc.wrapper.JTAConnection.checkConnection(JTAConnection.java:71)
at weblogic.jdbc.wrapper.Connection.preInvocationHandler(Connection.java:93)
at weblogic.jdbc.wrapper.Connection.prepareStatement(Connection.java:480)
at com.bea.p13n.property.SqlBundle.getStatement(SqlBundle.java:109)
at com.bea.p13n.property.internal.EntityPropertyManagerImpl.getStatement(EntityPropertyManagerImpl.java:2005)
at com.bea.p13n.property.internal.EntityPropertyManagerImpl.getUniqueId(EntityPropertyManagerImpl.java:654)
… 94 more[/code]