Pool connection issue with sql server database in adf application

Hi everyone
I'm Developing a BPM application using Oracle bpm 11.1.1.5.0
My JDeveloper version is 11.1.1.5.0 and my database is SQL Server 2008.
I have created a new BPM application, an application module and created several view objects based on my sql server tables in the database.
I have only one initiator user task which has a task flow and one jspx page for that.
The problem :
when I deploy the application, in the bpm workspace initiator page, the page is shown correctly only once every other time.
I mean it's strange, the first time the user instantiates the process, it's shown correctly. The second time, it is not! The third time, it is! etc...
The interesting part is, when the page is not shown correctly, if I refresh the page it will be shown correctly.
Here's the log output from when the page is not shown correctly:
JBO-30003: Application pool model.sam.specialAppModuleLocal fails to check out an application module due to the following exception:
java.lang.ClassCastException: weblogic.jdbc.wrapper.PoolConnection_com_microsoft_sqlserver_jdbc_SQLServerConnection cannot be cast to oracle.jdbc.OracleConnection
     at oracle.jbo.server.OracleSQLBuilderImpl.setSessionTimeZone(OracleSQLBuilderImpl.java:5535)
     at oracle.jbo.server.DBTransactionImpl.refreshConnectionMetadata(DBTransactionImpl.java:5307)
     at oracle.jbo.server.DBTransactionImpl.initTransaction(DBTransactionImpl.java:1190)
     at oracle.jbo.server.DBTransactionImpl.initTxn(DBTransactionImpl.java:6823)
     at oracle.jbo.server.DBTransactionImpl2.connectToDataSource(DBTransactionImpl2.java:301)
     at oracle.jbo.server.DBTransactionImpl2.connectToDataSource(DBTransactionImpl2.java:332)
     at oracle.jbo.common.ampool.DefaultConnectionStrategy.connect(DefaultConnectionStrategy.java:203)
     at oracle.jbo.server.ApplicationPoolMessageHandler.doPoolConnect(ApplicationPoolMessageHandler.java:592)
     at oracle.jbo.server.ApplicationPoolMessageHandler.doPoolMessage(ApplicationPoolMessageHandler.java:422)
     at oracle.jbo.server.ApplicationModuleImpl.doPoolMessage(ApplicationModuleImpl.java:8995)
     at oracle.jbo.common.ampool.ApplicationPoolImpl.sendPoolMessage(ApplicationPoolImpl.java:4603)
     at oracle.jbo.common.ampool.ApplicationPoolImpl.prepareApplicationModule(ApplicationPoolImpl.java:2533)
     at oracle.jbo.common.ampool.ApplicationPoolImpl.doCheckout(ApplicationPoolImpl.java:2343)
     at oracle.jbo.common.ampool.ApplicationPoolImpl.useApplicationModule(ApplicationPoolImpl.java:3242)
     at oracle.jbo.common.ampool.SessionCookieImpl.useApplicationModule(SessionCookieImpl.java:572)
     at oracle.jbo.http.HttpSessionCookieImpl.useApplicationModule(HttpSessionCookieImpl.java:234)
     at oracle.jbo.common.ampool.SessionCookieImpl.useApplicationModule(SessionCookieImpl.java:505)
     at oracle.jbo.common.ampool.SessionCookieImpl.useApplicationModule(SessionCookieImpl.java:500)
     at oracle.adf.model.bc4j.DCJboDataControl.initializeApplicationModule(DCJboDataControl.java:516)
     at oracle.adf.model.bc4j.DCJboDataControl.getApplicationModule(DCJboDataControl.java:862)
     at oracle.adf.model.binding.DCDataControl.setErrorHandler(DCDataControl.java:483)
     at oracle.jbo.uicli.binding.JUApplication.setErrorHandler(JUApplication.java:261)
     at oracle.adf.model.BindingContext.put(BindingContext.java:1326)
     at oracle.adf.model.binding.DCDataControlReference.getDataControl(DCDataControlReference.java:174)
     at oracle.adf.model.BindingContext.instantiateDataControl(BindingContext.java:1045)
     at oracle.adf.model.dcframe.DataControlFrameImpl.doFindDataControl(DataControlFrameImpl.java:1565)
     at oracle.adf.model.dcframe.DataControlFrameImpl.internalFindDataControl(DataControlFrameImpl.java:1437)
     at oracle.adf.model.dcframe.DataControlFrameImpl.findDataControl(DataControlFrameImpl.java:1397)
     at oracle.adf.model.BindingContext.internalFindDataControl(BindingContext.java:1175)
     at oracle.adf.model.BindingContext.get(BindingContext.java:1128)
     at oracle.adf.model.binding.DCParameter.evaluateValue(DCParameter.java:82)
     at oracle.adf.model.binding.DCParameter.getValue(DCParameter.java:111)
     at oracle.adf.model.binding.DCBindingContainer.getChildByName(DCBindingContainer.java:2711)
     at oracle.adf.model.binding.DCBindingContainer.internalGet(DCBindingContainer.java:2759)
     at oracle.adf.model.binding.DCExecutableBinding.get(DCExecutableBinding.java:115)
     at oracle.adf.model.binding.DCUtil.findSpelObject(DCUtil.java:328)
     at oracle.adf.model.binding.DCBindingContainer.evaluateParameterWithElCheck(DCBindingContainer.java:1460)
     at oracle.adf.model.binding.DCBindingContainer.findDataControl(DCBindingContainer.java:1590)
     at oracle.adf.model.binding.DCIteratorBinding.initDataControl(DCIteratorBinding.java:2472)
     at oracle.adf.model.binding.DCIteratorBinding.getDataControl(DCIteratorBinding.java:2416)
     at oracle.adf.model.binding.DCIteratorBinding.getAttributeDefs(DCIteratorBinding.java:3201)
     at oracle.jbo.uicli.binding.JUCtrlValueBinding.fetchAttrDefs(JUCtrlValueBinding.java:501)
     at oracle.jbo.uicli.binding.JUCtrlValueBinding.getAttributeDefs(JUCtrlValueBinding.java:452)
     at oracle.jbo.uicli.binding.JUCtrlValueBinding.getAttributeDef(JUCtrlValueBinding.java:528)
     at oracle.jbo.uicli.binding.JUCtrlValueBinding.getAttributeDef(JUCtrlValueBinding.java:518)
     at oracle.jbo.uicli.binding.JUCtrlValueBinding$1JUAttributeDefHintsMap.<init>(JUCtrlValueBinding.java:3918)
     at oracle.jbo.uicli.binding.JUCtrlValueBinding.getAttributeHintsMap(JUCtrlValueBinding.java:4020)
     at oracle.jbo.uicli.binding.JUCtrlValueBinding.getHints(JUCtrlValueBinding.java:2442)
     at oracle.jbo.uicli.binding.JUCtrlValueBinding.internalGet(JUCtrlValueBinding.java:2277)
     at oracle.adfinternal.view.faces.model.binding.FacesCtrlAttrsBinding.internalGet(FacesCtrlAttrsBinding.java:277)
     at oracle.adf.model.binding.DCControlBinding.get(DCControlBinding.java:749)
     at javax.el.MapELResolver.getValue(MapELResolver.java:164)
     at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:173)
     at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:200)
     at com.sun.el.parser.AstValue.getValue(Unknown Source)
     at com.sun.el.ValueExpressionImpl.getValue(Unknown Source)
     at org.apache.myfaces.trinidad.bean.FacesBeanImpl.getProperty(FacesBeanImpl.java:68)
     at oracle.adfinternal.view.faces.renderkit.rich.LabelLayoutRenderer.getLabel(LabelLayoutRenderer.java:934)
     at oracle.adfinternal.view.faces.renderkit.rich.LabelLayoutRenderer.encodeAll(LabelLayoutRenderer.java:213)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelLabelAndMessageRenderer.encodeAll(PanelLabelAndMessageRenderer.java:114)
     at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1396)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:335)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:767)
     at javax.faces.component.UIComponent.encodeAll(UIComponent.java:937)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:399)
     at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:2633)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelFormLayoutRenderer._encodeFormItem(PanelFormLayoutRenderer.java:1015)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelFormLayoutRenderer.access$100(PanelFormLayoutRenderer.java:46)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelFormLayoutRenderer$FormColumnEncoder.processComponent(PanelFormLayoutRenderer.java:1491)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelFormLayoutRenderer$FormColumnEncoder.processComponent(PanelFormLayoutRenderer.java:1410)
     at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:170)
     at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:290)
     at org.apache.myfaces.trinidad.component.UIXComponent.encodeFlattenedChildren(UIXComponent.java:255)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelFormLayoutRenderer._encodeChildren(PanelFormLayoutRenderer.java:352)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelFormLayoutRenderer.encodeAll(PanelFormLayoutRenderer.java:187)
     at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1396)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:335)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:767)
     at javax.faces.component.UIComponent.encodeAll(UIComponent.java:937)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:399)
     at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:2633)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer._encodeChild(PanelGroupLayoutRenderer.java:432)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer.access$300(PanelGroupLayoutRenderer.java:30)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer$EncoderCallback.processComponent(PanelGroupLayoutRenderer.java:682)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer$EncoderCallback.processComponent(PanelGroupLayoutRenderer.java:601)
     at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:170)
     at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:290)
     at org.apache.myfaces.trinidad.component.UIXComponent.encodeFlattenedChildren(UIXComponent.java:255)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer.encodeAll(PanelGroupLayoutRenderer.java:358)
     at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1396)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:335)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:767)
     at javax.faces.component.UIComponent.encodeAll(UIComponent.java:937)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:399)
     at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:2633)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeAllChildren(CoreRenderer.java:415)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelHeaderRenderer.renderChildrenAfterHelpAndInfo(PanelHeaderRenderer.java:508)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelHeaderRenderer._renderContentCell(PanelHeaderRenderer.java:1032)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelHeaderRenderer.renderContentRow(PanelHeaderRenderer.java:456)
     at oracle.adfinternal.view.faces.renderkit.rich.ShowDetailHeaderRenderer.renderContentRow(ShowDetailHeaderRenderer.java:165)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelHeaderRenderer.encodeAll(PanelHeaderRenderer.java:217)
     at oracle.adfinternal.view.faces.renderkit.rich.ShowDetailHeaderRenderer.encodeAll(ShowDetailHeaderRenderer.java:86)
     at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1396)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:335)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:767)
     at javax.faces.component.UIComponent.encodeAll(UIComponent.java:937)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:399)
     at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:2633)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer._encodeChild(PanelGroupLayoutRenderer.java:432)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer.access$300(PanelGroupLayoutRenderer.java:30)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer$EncoderCallback.processComponent(PanelGroupLayoutRenderer.java:682)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer$EncoderCallback.processComponent(PanelGroupLayoutRenderer.java:601)
     at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:170)
     at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:290)
     at org.apache.myfaces.trinidad.component.UIXComponent.encodeFlattenedChildren(UIXComponent.java:255)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer.encodeAll(PanelGroupLayoutRenderer.java:358)
     at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1396)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:335)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:767)
     at javax.faces.component.UIComponent.encodeAll(UIComponent.java:937)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:399)
     at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:2633)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeAllChildren(CoreRenderer.java:415)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelHeaderRenderer.renderChildrenAfterHelpAndInfo(PanelHeaderRenderer.java:508)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelHeaderRenderer._renderContentCell(PanelHeaderRenderer.java:1032)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelHeaderRenderer.renderContentRow(PanelHeaderRenderer.java:456)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelHeaderRenderer.encodeAll(PanelHeaderRenderer.java:217)
     at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1396)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:335)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:767)
     at javax.faces.component.UIComponent.encodeAll(UIComponent.java:937)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:399)
     at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:2633)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer._encodeChild(PanelGroupLayoutRenderer.java:432)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer.access$300(PanelGroupLayoutRenderer.java:30)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer$EncoderCallback.processComponent(PanelGroupLayoutRenderer.java:682)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer$EncoderCallback.processComponent(PanelGroupLayoutRenderer.java:601)
     at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:170)
     at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:290)
     at org.apache.myfaces.trinidad.component.UIXComponent.encodeFlattenedChildren(UIXComponent.java:255)
     at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer.encodeAll(PanelGroupLayoutRenderer.java:358)
     at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1396)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:335)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:767)
     at javax.faces.component.UIComponent.encodeAll(UIComponent.java:937)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:399)
     at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:2633)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeAllChildren(CoreRenderer.java:415)
     at oracle.adfinternal.view.faces.renderkit.rich.FormRenderer.encodeAll(FormRenderer.java:220)
     at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1396)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:335)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:767)
     at javax.faces.component.UIComponent.encodeAll(UIComponent.java:937)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:399)
     at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:2633)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeAllChildren(CoreRenderer.java:415)
     at oracle.adfinternal.view.faces.renderkit.rich.DocumentRenderer.encodeAll(DocumentRenderer.java:1273)
     at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1396)
     at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:335)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:767)
     at javax.faces.component.UIComponent.encodeAll(UIComponent.java:937)
     at javax.faces.component.UIComponent.encodeAll(UIComponent.java:933)
     at com.sun.faces.application.ViewHandlerImpl.doRenderView(ViewHandlerImpl.java:266)
     at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:197)
     at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:189)
     at org.apache.myfaces.trinidadinternal.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:193)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._renderResponse(LifecycleImpl.java:800)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase(LifecycleImpl.java:294)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:214)
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:266)
     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:300)
     at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:205)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.adf.share.http.ServletADFFilter.doFilter(ServletADFFilter.java:62)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:106)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:446)
     at oracle.adfinternal.view.faces.activedata.AdsFilter.doFilter(AdsFilter.java:60)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:446)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:271)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:177)
     at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.bpel.services.workflow.client.worklist.util.WorkflowFilter.doFilter(WorkflowFilter.java:205)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.bpel.services.workflow.client.worklist.util.DisableUrlSessionFilter.doFilter(DisableUrlSessionFilter.java:70)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.adf.library.webapp.LibraryFilter.doFilter(LibraryFilter.java:175)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:111)
     at java.security.AccessController.doPrivileged(Native Method)
     at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:313)
     at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:413)
     at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:94)
     at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:161)
     at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.dms.servlet.DMSServletFilter.doFilter(DMSServletFilter.java:136)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3715)
     at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681)
     at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
     at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
     at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277)
     at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)
     at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)
     at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
     at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)I'm almost sure this is a configuration issue and not anything else.
Can some one please show me what I'm doing wrong here?
Thanks in advance

Hello thank you
I found the file and changed the SQL Flavor to SQL Server but it still shows a blank page with the error instead of the page every once in a while.
The error has changed though, now it is like this:
oracle.adf.controller.activity.ActivityLogicException: ADFC-06014: An exception occured when invoking a task flow finalizer.
     at oracle.adfinternal.controller.util.Utils.createAndLogActivityLogicException(Utils.java:230)
     at oracle.adfinternal.controller.activity.TaskFlowReturnActivityLogic.invokeFinalizer(TaskFlowReturnActivityLogic.java:697)
     at oracle.adfinternal.controller.activity.TaskFlowReturnActivityLogic.abandonTaskFlow(TaskFlowReturnActivityLogic.java:412)
     at oracle.adfinternal.controller.engine.ControlFlowEngine.handleException(ControlFlowEngine.java:668)
     at oracle.adfinternal.controller.engine.ControlFlowEngine.doRouting(ControlFlowEngine.java:887)
     at oracle.adfinternal.controller.engine.ControlFlowEngine.doRouting(ControlFlowEngine.java:778)
     at oracle.adfinternal.controller.engine.ControlFlowEngine.invokeTaskFlow(ControlFlowEngine.java:243)
     at oracle.adfinternal.controller.application.RemoteTaskFlowCallRequestHandler.invokeTaskFlowByUrl(RemoteTaskFlowCallRequestHandler.java:99)
     at oracle.adfinternal.controller.application.RemoteTaskFlowCallRequestHandler.doCreateView(RemoteTaskFlowCallRequestHandler.java:64)
     at oracle.adfinternal.controller.application.BaseRequestHandlerImpl.createView(BaseRequestHandlerImpl.java:57)
     at org.apache.myfaces.trinidadinternal.application.ViewHandlerImpl.createView(ViewHandlerImpl.java:95)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._restoreView(LifecycleImpl.java:662)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase(LifecycleImpl.java:301)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:186)
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
     at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
     at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
     at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
     at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:205)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:106)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:446)
     at oracle.adfinternal.view.faces.activedata.AdsFilter.doFilter(AdsFilter.java:60)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:446)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:271)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:177)
     at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.bpel.services.workflow.client.worklist.util.WorkflowFilter.doFilter(WorkflowFilter.java:205)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.bpel.services.workflow.client.worklist.util.DisableUrlSessionFilter.doFilter(DisableUrlSessionFilter.java:70)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.adf.library.webapp.LibraryFilter.doFilter(LibraryFilter.java:175)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:111)
     at java.security.AccessController.doPrivileged(Native Method)
     at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:313)
     at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:413)
     at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:94)
     at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:161)
     at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at oracle.dms.servlet.DMSServletFilter.doFilter(DMSServletFilter.java:136)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3715)
     at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681)
     at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
     at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
     at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277)
     at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)
     at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)
     at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
     at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)
Caused by: javax.el.ELException: java.lang.NullPointerException: FacesContext.getRenderKit() returned null while trying to get the org.apache.myfaces.trinidad.render.ExtendedRenderKitService service;  please check your configuration.
     at com.sun.el.parser.AstValue.invoke(Unknown Source)
     at com.sun.el.MethodExpressionImpl.invoke(Unknown Source)
     at oracle.adf.controller.internal.util.ELInterfaceImpl.invokeMethod(ELInterfaceImpl.java:173)
     at oracle.adfinternal.controller.activity.TaskFlowReturnActivityLogic.invokeFinalizer(TaskFlowReturnActivityLogic.java:693)
     ... 55 more
Caused by: java.lang.NullPointerException: FacesContext.getRenderKit() returned null while trying to get the org.apache.myfaces.trinidad.render.ExtendedRenderKitService service;  please check your configuration.
     at org.apache.myfaces.trinidad.util.Service.getRenderKitService(Service.java:113)
     at oracle.bpel.services.workflow.worklist.adf.InvokeActionBean.invokeScript(InvokeActionBean.java:1083)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)
     ... 59 more
I have noticed that this time only if the user submits the page, the next time he/she initiates a new task the error appears.
Do u think this has to do something with pool settings or session settings or something like that?
Thanks again

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